Abstract: Described herein are high capacity electrochemical cells including a first electrode comprising a metal oxide, such as acidified metal oxide (“AMO”) materials, and a second electrode comprising lithium metal, where the metal oxide is present in the first electrode at less than 80 weight percent. Methods of making electrodes comprising a metal oxide and methods of making electrochemical cells are also disclosed.

Abstract: The application provides a non-aqueous electrolyte for lithium ion battery. The non-aqueous electrolyte for lithium ion battery comprises a compound A represented by formula I and a compound B represented by formula II, In formula I, R1, R2 and R3 are independently selected from C1-C5 alkyl or haloalkyl, C2-C5 unsaturated hydrocarbon group or unsaturated halohydrocarbon group, and at least one of R1, R2 and R3 is the unsaturated hydrocarbon group or unsaturated halohydrocarbon group; In formula II, R4, R5, R6, R7, R8 and R9 are each independently selected from one of hydrogen atom, fluorine atom and C1-C5 group. The non-aqueous electrolyte for lithium ion battery provided by the application enables the battery to have excellent cycle performance and high-temperature storage performance through the synergistic effect of the compound A and the compound B.

Abstract: Systems and methods for controlling the emission of gases and/or flames emitted from one or more electrochemical cells are disclosed. In one exemplary embodiment, gas emitted from an electrochemical cell located within an interior of an enclosure may be flowed through a flow restriction to reduce a pressure and/or temperature of the gas and/or the gas may be flowed through a catalyst prior to exiting through an outlet of the enclosure.

Abstract: The present invention concerns a mixture comprising: —lithium bis(fluorosulfonyl)imide; —lithium 2-trifluoromethyl-4,5-dicyano-imidazole; and —lithium hexafluorophosphate; as well as an electrolyte composition comprising said mixture, and their uses.

Abstract: Disclosed is an electrolyte for a secondary battery, and a secondary battery comprising the same, and in particular, to an electrolyte for a secondary battery including an electrolyte salt, an organic solvent and an additive, wherein the additive includes at least one compound selected from the group consisting of a compound having an N—Si-based bond and a compound having an O—Si-based bond.

Abstract: The present invention relates to a nonaqueous electrolytic solution for use in a nonaqueous electrolytic solution secondary battery that comprises a negative electrode and a positive electrode capable of storing and releasing metal ions, and a nonaqueous electrolytic solution, wherein the nonaqueous electrolytic solution contains the specific compounds (A) and (B).

Abstract: A purpose of the present invention is to provide a lithium ion secondary battery which has further improved life characteristics. The lithium ion secondary battery of the present invention is characterized by comprising a positive electrode comprising a positive electrode active material that operates at 4.5 V or more with respect to lithium, and an electrolyte solution comprising an electrolyte solvent comprising a fluorinated ether, a cyclic sulfonic acid ester and LiN(FSO2)2.

Abstract: Various implementations of a method of forming an electrochemical cell include providing a first electrode, a second electrode, a separator between the first and second electrodes, and an electrolyte in a cell container. The first electrode can include silicon-dominant electrochemically active material. The silicon-dominant electrochemically active material can include greater than 50% silicon by weight. The method can also include exposing at least a part of the electrochemical cell to CO2, and forming a solid electrolyte interphase (SEI) layer on the first electrode using the CO2.

Abstract: Electrolytes and electrolyte additives for energy storage devices comprising a silicon compound are disclosed. The energy storage device comprises a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode is a Si-based electrode, a separator between the first electrode and the second electrode, an electrolyte, and at least one electrolyte additive selected from a silicon compound.

Abstract: Provided is a lithium secondary battery comprising a cathode, an anode, and a non-aqueous electrolyte having lithium ion conductivity. A lithium metal is precipitated on a surface of the anode during charge of the lithium secondary battery. The lithium metal is dissolved from the surface of the anode in the non-aqueous electrolyte during discharge of the lithium secondary battery. The non-aqueous electrolyte contains a solvent and a lithium salt. The solvent includes a fluorinated ether. The fluorinated ether has a fluorination ratio of more than 0% and not more than 60%.

Abstract: Disclosed is an additive for nonaqueous electrolyte solutions, including a first compound represented by the formula (1), and at least one second compound selected from the group consisting of an ethylene carbonate compound, a vinyl ethylene carbonate compound, a cyclic sulfonic acid ester compound, and a cyclic disulfonic acid ester compound, in the formula (1), X represents a sulfonyl group or a carbonyl group, and R1 represents an alkyl group having 1 to 4 carbon atoms and optionally substituted with a halogen atom or the like.

Abstract: A hybrid solid state electrolyte (SSE) can include a plurality of SSE particles suspended in a salt-in-solvent (SIS). A battery can include the hybrid SSE. The battery can be formed by at least forming the hybrid SSE in situ. Forming the hybrid SSE in situ can include: depositing, on a surface of an electrode of the battery, a mixture comprising the SSE particles and at least a portion of salt for the SIS; filling the battery with a solvent; and heating the battery to form the SIS by at least melting and/or dissolving the portion of the salt into the solvent.

Abstract: The application provides a non-aqueous electrolyte for lithium ion battery. The non-aqueous electrolyte for lithium ion battery comprises a compound A represented by formula I and a compound B represented by formula II, In formula I, R1, R2 and R3 are independently selected from C1-C5 alkyl or haloalkyl, C2-C5 unsaturated hydrocarbon group or unsaturated halohydrocarbon group, and at least one of R1, R2 and R3 is the unsaturated hydrocarbon group or unsaturated halohydrocarbon group; In formula II, R4, R5, R6, R7, R8 and R9 are each independently selected from one of hydrogen atom, fluorine atom and C1-C5 group. The non-aqueous electrolyte for lithium ion battery provided by the application enables the battery to have excellent cycle performance and high-temperature storage performance through the synergistic effect of the compound A and the compound B.

Abstract: In order to solve the problem of poor cycle performance (especially high temperature cycle performance) of the existing lithium ion battery electrolyte containing anhydride or anhydride derivatives, the disclosure provides a non-aqueous electrolyte for lithium ion battery. The non-aqueous electrolyte for lithium ion battery comprises a compound A represented by formula I and a compound B represented by formula II, In the structural formula I, R0 is C2-C4 alkylene or alkenylene, or C2-C4 fluoroalkylene or fluoroalkenylene; In formula II, R1, R2, R3, R4, R5 and R6 are each independently selected from one of hydrogen atom, fluorine atom and C1-C5 group. The non-aqueous electrolyte for lithium ion battery provided by the invention is obtained by combining the compound A and compound B, so that the lithium ion battery containing the non-aqueous electrolyte has better cycle performance and high-temperature storage performance.

Abstract: Localized high-salt-concentration electrolytes each containing a salt, a glyme as a solvent, and a fluorinated diluent. In some embodiments, the glyme has a chemical formula R1—(O—CH2—CH2)n—O—R2, wherein n=1 to 4 and at least one of R1 and R2 is a hydrocarbon sidechain having at least 2 carbon atoms and wherein the salt is soluble in the glyme. In some embodiments, the fluorinated diluent is selected from the group consisting of a fluorinated glyme and a fluorinated ether. In some embodiments, the salt includes an alkali-metal salt. In some embodiments, the salt includes an alkali-earth-metal salt. The salt may include a perfluorinated sulfonimide salt. Electrochemical devices that include localized high-salt-concentration electrolytes of the present disclosure are also disclosed.

Abstract: The present invention relates to a multilayer electrolyte cell, a secondary battery including the multilayer electrolyte cell, and a manufacturing method thereof, and more particularly, to a multilayer electrolyte cell, in which electrolytes are configured in multiple layers by stacking polymer coating layers containing ceramic solid electrolytes and liquid electrolytes including an ionic liquid in a porous structure base, a secondary battery including the multilayer electrolyte cell, and a manufacturing method thereof.

Abstract: A lithium salt mixture comprising: from 85% to 99.9 mol % of lithium bis(fluorosulfonyl)imidide; and from 0.1% to 15 mol % of lithium 2-trifluoromethyl-4,5-dicyano-imidazolate. Also, an electrolyte composition containing same and to the uses thereof. Also, an electrochemical cell including a negative electrode, a positive electrode and the electrolyte composition interposed between the negative electrode and the positive electrode. Also, a battery containing at least one electrochemical cell with the electrolyte composition.

Abstract: Electrolyte formulations including a high salt concentration. The electrolyte formulation includes an organic solvent and a lithium salt, wherein the lithium salt is mixed with the organic solvent at a concentration of at least 20 Mole %, or at least 40 Mole %, or at least 50 Mole %. The organic solvent includes N-methyl-2-pyrrolidone, butylene carbonate, butyl propionate, pentyl acetate, ?-caprolactone, propylene glycol sulfite, ethyl methyl sulfone, butyl sulfoxide or combinations thereof. The lithium salt includes lithium bis(trifluoromethane sulfonyl) imide, lithium tetrafluoroborate, or lithium hexafluorophosphate.

Abstract: The present invention relates to a non-aqueous electrolyte solution additive, and a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery which comprise the same, wherein, specifically, since the non-aqueous electrolyte solution, which comprises a compound capable of maintaining a passive effect by increasing an effect of forming a solid electrolyte interface (SEI) on surfaces of a positive electrode and a negative electrode, is provided, high-temperature storage characteristics and life characteristics of the lithium secondary battery may be improved.

Abstract: An electrochemical cell management system comprising an electrochemical cell and at least one controller configured to control the cell such that, for at least a portion of a charge cycle, the cell is charged at a charging rate or current that is lower than a discharging rate or current of at least a portion of a previous discharge cycle. An electrochemical cell management method. An electrochemical cell management system comprising an electrochemical cell and at least one controller configured to induce a discharge of the cell before and/or after a charging step of the cell. An electrochemical cell management method. A electrochemical cell management system comprising an electrochemical cell and at least one controller configured to: monitor at least one characteristic of the cell and, based on the at least one characteristic of the cell, induce a discharge and/or control a charging rate or current of the cell.

Abstract: An improved electrolyte including a fire-retardant additive suitable for application in wide temperature cell and/or battery operation with safer cell design, a battery including the electrolyte and a separator optionally containing a fire-retardant additive, improved electrical and thermal conductive electrodes are disclosed. The presence of the fire-retardant additive reduces flammability of the electrolyte and improved the overall safety of the battery.

Abstract: To provide a non-aqueous electrolyte solution capable of improving cycle characteristics of a secondary battery, and a non-aqueous electrolyte secondary battery using the non-aqueous electrolyte solution. A non-aqueous electrolyte solution according to an embodiment of the present technology includes an electrolyte salt and a non-aqueous solvent. The electrolyte salt contains an imide salt as a main electrolyte salt and at least one lithium oxalate borate selected from the group consisting of lithium bis(oxalate) borate (LiBOB), lithium fluoro(oxalate) borate (LiFOB), and lithium difluoro(oxalate) borate (LiDFOB). The non-aqueous solvent contains at least one halogenated carbonic acid ester selected from the group consisting of a halogenated chain carbonic acid ester and a halogenated cyclic carbonic acid ester.

Abstract: The present disclosure provides a nonaqueous electrolyte solution that is used in a nonaqueous electrolyte secondary battery. The nonaqueous electrolyte solution contains a fluorinated solvent, a predetermined additive A and a predetermined additive B. A ratio (CA/CB) of concentration CA (mol/L) of the additive A and concentration CB (mol/L) of the additive B lies in a range of 1 to 30.

Abstract: A method of producing a pre-sulfurized active cathode layer for a rechargeable alkali metal-sulfur cell; the method comprising: (a) preparing an integral layer of mesoporous structure of a carbon, graphite, metal, or conductive polymer having a specific surface area greater than 100 m2/g; (b) preparing an electrolyte comprising a solvent and a sulfur source; (c) preparing an anode; and (d) bringing the integral layer and the anode in ionic contact with the electrolyte and imposing an electric current between the anode and the integral layer (serving as a cathode) to electrochemically deposit nanoscaled sulfur particles or coating on the graphene surfaces. The sulfur particles or coating have a thickness or diameter smaller than 20 nm (preferably <10 nm, more preferably <5 nm or even <3 nm) and occupy a weight fraction of at least 70% (preferably >90% or even >95%).

Abstract: Disclosed are an apparatus and method for managing a battery. The battery management apparatus includes a thickness calculator configured to calculate a thickness of a battery on the basis of a capacitance of the battery and an information generator configured to generate a battery-state information by subtracting an increase in a thickness of the battery according to temperature of the battery from the calculated thickness.

Abstract: Disclosed is a rechargeable lithium battery including a positive electrode including a positive active material; a negative electrode including a negative active material; an electrolyte solution including a lithium salt and a non-aqueous organic solvent; and a separator between the positive and the negative electrodes, the separator including a porous substrate and a coating layer positioned on at least one side of the porous substrate. The negative active material includes a Si-based material; the non-aqueous organic solvent includes cyclic carbonate including ethylene carbonate, propylene carbonate, or combinations thereof, the cyclic carbonate being included in an amount of about 20 volume % to about 60 volume % based on the total amount of the non-aqueous organic solvent; and the coating layer includes a fluorine-based polymer, an inorganic compound, or combinations thereof. The rechargeable lithium battery has improved cycle-life and high temperature storage characteristics.

Abstract: Electrolyte solutions for flow batteries and other electrochemical systems can contain an active material that is capable of transferring one or more electrons per molecule during an oxidation-reduction cycle. Doubly bridged aromatic groups or their coordination compounds can be particularly suitable active materials. Flow batteries can include a first half-cell containing a first electrolyte solution, and a second half-cell containing a second electrolyte solution, in which at least one of the first electrolyte solution and the second electrolyte solution contains an active material having at least two aromatic groups doubly bridged by a carbonyl moiety and a bridging moiety containing a bridging atom selected from carbon, nitrogen, oxygen, sulfur, selenium and tellurium. Such bridged compounds can directly function as the active material, or coordination compounds containing the bridged compounds as at least one ligand can serve as the active material.

Abstract: The present invention relates to a ternary liquid electrolyte for a lithium-sulfur battery and a lithium-sulfur battery including the same. The liquid electrolyte for a lithium-sulfur battery according to the present invention exhibits an excellent sulfur utilization rate when used in a lithium-sulfur battery, and exhibits excellent stability. Accordingly, the liquid electrolyte for a lithium-sulfur battery according to the present invention is capable of enhancing a life time property while securing a capacity property of a lithium-sulfur battery.

Abstract: The present invention relates to a battery system capable of mitigating the performance deterioration of a secondary battery cell and extending a period of use by additionally injecting a second electrolyte at a point in time when the capacity of the secondary battery cell has decreased, and a method for operating a battery system which can achieve the same.

Abstract: Electrolyte compositions comprising fluorinated acyclic carboxylic acid esters, fluorinated acyclic carbonates, and/or fluorinated acyclic ethers; co-solvents; and certain film-forming chemical compounds are described. The electrolyte compositions are useful in electrochemical cells, such as lithium ion batteries where they provide the improved performance of a combination of high capacity and high cycle life.

Abstract: A secondary battery includes: a cathode; an anode; and an electrolytic solution including a cyano compound, the cyano compound including a compound represented by R1-O—C(?O)—O—R2 (R1, R2, or both include a cyano-group-containing group), a compound represented by R3-C(?O)—O—R4 (R4 includes the cyano-group-containing group), or both.

Abstract: A positive electrode for a lithium ion secondary battery that includes a positive electrode combination material having a positive electrode active material that produces a potential of 4.5 V or higher on the basis of metal lithium; a conduction aid; and a binder. The binder contains an aqueous binder as its main constituent, and the sum SE of the surface area SA of the positive electrode active material in the positive electrode combination material and the surface area SC of the conduction aid therein is 90 to 400 cm2/cm2 per unit coated area of the positive electrode combination material.

Abstract: Organosilicon electrolytes exhibit several important properties for use in lithium carbon monofluoride batteries, including high conductivity/low viscosity and thermal/electrochemical stability. Conjugation of an anion binding agent to the siloxane backbone of an organosilicon electrolyte creates a bi-functional electrolyte. The bi-functionality of the electrolyte is due to the ability of the conjugated polyethylene oxide moieties of the siloxane backbone to solvate lithium and thus control the ionic conductivity within the electrolyte, and the anion binding agent to bind the fluoride anion and thus facilitate lithium fluoride dissolution and preserve the porous structure of the carbon monofluoride cathode. The ability to control both the electrolyte conductivity and the electrode morphology/properties simultaneously can improve lithium electrolyte operation.

Abstract: The present application provides a high-temperature lithium-ion battery electrolyte, including a lithium salt, an organic solvent, and a water removal additive. A structural formula of the water removal additive is shown as a formula (1): where R1 is a —NCH—(CH2)n—CN group, and 0<n?20; R2 is a —R11—CO—NR12R13 group, R11 is a —(CH2)m— group, 0?m<19, each of R12 and R13 is one independently selected from H and —(CH2)x—CH3 groups, 0?x?19-m, and both m and x are integers; and R3 is any one selected from H, F, Cl, and Br. The high-temperature lithium-ion battery electrolyte can effectively eliminate trace water in a battery system, restrain HF generation, protect an electrochemical system in a battery, and significantly improve high-temperature storage performance and high-temperature cycling performance of a lithium-ion battery. The present invention further provides a production method for the electrolyte and a high-temperature lithium-ion battery that includes the electrolyte.

Abstract: Low flammability and nonflammable localized superconcentrated electrolytes (LSEs) for stable operation of lithium and sodium ion batteries are disclosed. Electrochemical devices including the low flammability and nonflammable LSEs are also disclosed. The low flammability and nonflammable LSEs include an active salt, a solvent comprising a flame retardant compound, wherein the active salt is soluble in the solvent, and a diluent in which the active salt is insoluble or poorly soluble. The LSE may further include a cosolvent, such as a carbonate, a sulfone, a sulfite, a sulfate, a carboxylate, an ether, a nitrogen-containing solvent, or any combination thereof. In certain embodiments, such as when the solvent and diluent are immiscible, the LSE further includes a bridge solvent.

Abstract: A secondary battery is provided. The secondary battery includes a cathode; an anode; and an electrolytic solution, wherein the anode comprises an anode active material layer, wherein the anode active material layer comprises a carbon material, wherein the anode active material layer has a thickness from about 40 micrometers to about 100 micrometers, and wherein the electrolytic solution comprises an unsaturated cyclic ester carbonate represented by Formula (2): where R5 and R6 are selected from the group consisting of a hydrogen group, an alkyl group, an alkyne group, and an aryl group.

Abstract: The present invention discloses a lithium-ion battery electrolyte and a lithium-ion battery. The electrolyte comprises an organic non-aqueous solution, a lithium salt, and an additive. The additive comprises: (A) fluoroethylene carbonate; (B) at least one compound from the following: a saturated dinitrile or an unsaturated nitrile as represented by structural formula (1), wherein R1 is an unsaturated hydrocarbon group with 3-6 carbon atoms and R2 is an alkene group with 2-5 carbon atoms; and (C) at least one unsaturated phosphate ester as represented by structural formula (2), wherein R3, R4, and R5 are each a hydrocarbon with 1-4 carbon atoms, and at least one of R3, R4, and R5 contain an unsaturated hydrocarbon with a triple bond.

Abstract: The present invention relates to a positive electrode for a rechargeable lithium battery and a rechargeable lithium battery including the same. The positive electrode includes: a current collector; and a positive electrode active material positioned on at least one surface of the active material layer current collector. The positive electrode active material layer includes a small particle size active material having an average particle diameter D50 of 2 ?m to 4 ?m and a first coating layer positioned at a surface thereof, and a large particle size active material having an average particle diameter D50 of 17 ?m to 21 ?m and a second coating layer positioned at the surface thereof.

Abstract: A secondary battery and its preparation method, the secondary battery having a negative electrode containing a negative current collector and no negative active material; an electrolyte having an electrolyte salt and an organic solvent; a separator; a positive electrode having a positive active material layer containing a positive active material, wherein the positive active material comprises a material having a layered crystal structure; and a battery case used for packaging. Main active component of the secondary battery is the positive active material having a layered crystal structure, which is environmentally-friendly and low in cost; meanwhile, negative active material is not needed by the second battery system, thereby remarkably reducing the weight and cost of the battery and improving the battery energy density. The reaction mechanism adopted by the secondary battery significantly increases the working voltage of the battery and further improves the energy density of the battery.

Abstract: The invention is a resin composition containing following polymer (A) and polymer (B), wherein a content of the polymer (A) is 1 to 80 wt % based on the total weight of the polymer (A) and the polymer (B), polymer (A) is a alicyclic structure-containing hydrogenated polymer having a heat distortion temperature of 170° C. or higher, polymer (B) is a polymer incompatible with the polymer (A) and having a heat distortion temperature of lower than 170° C., a microporous film formed by using the resin composition, a separator including the microporous film, and a secondary battery having the separator. One aspect of the invention provides a resin composition suitably used as a raw material for a separator of a secondary battery excellent in safety, a microporous film obtained by forming the resin composition, a separator including the microporous film, and a secondary battery having the separator.

Abstract: A method of preparing a lithium-ion cell (10), the method including providing to an electrolyte (22) of the cell, an additive configured to improve formation of a solid electrolyte interface (24) on an anode (12), charging the cell (10) at a first predetermined charge rate (C1) up to a first predetermined voltage (V1), wherein the first predetermined voltage (V1) corresponds to a voltage at which the additive begins formation of the solid electrolyte interface (24), charging the cell (10) at a second predetermined rate (C2) to a second predetermined voltage (V2), wherein the second predetermined voltage (V2) corresponds to a voltage at which the electrolyte (22) begins formation of the solid electrolyte interface (24); and charging the cell (10) to a fully charged capacity at a third predetermined charge rate (C3), the third charge rate (C3) being greater than the second charge rate (C2).

Abstract: Electrochemical cells that cycle lithium ions are provided. The electrochemical cells have an electrode that includes a silicon-containing electroactive material that undergoes volumetric expansion and contraction during the cycling of the electrochemical cell; and an electrolyte system that promotes passive formation of a flexible protective layer comprising a lithium fluoride-polymer composite on one or more exposed surface regions of the silicon-containing electroactive material. The electrolyte system includes a lithium salt, at least one cyclic carbonate, and two or more linear carbonates. At least one of the two or more linear carbonate-containing co-solvents is a fluorinated carbonate-containing co-solvent. The electrolyte system accommodates the volumetric expansion and contraction of the silicon-containing electroactive material to promote long term cycling stability.

Abstract: A cathode in a state prior to a first charging process is provided having an active cathode material and lithium peroxide. A lithium ion battery or an electrochemical cell includes the same cathode. A method is also provided for forming a lithium ion battery, and a lithium ion battery is provided which includes a cathode having an active cathode material, a separator, an anode having an active anode material, and an electrolyte, wherein after a formed cell is fully discharged, the active cathode material holds the same lithium content as before the formation process.

Abstract: The present invention relates to a pouch type secondary battery comprising a safety member, such as dodecafluoro-2-methylpentane-3-one, between an external pouch and an internal pouch, wherein the safety member allows the cell temperature to be kept low or enables extinguishing at the time of cell ignition, and has an effect of improving the suppression of moisture permeation.

Abstract: The present invention relates to a method of manufacturing a negative electrode and a negative electrode manufactured using the method. According to the present invention, negative electrode samples are fabricated to have different electrode densities, and then, in a negative electrode expansion curve of each negative electrode sample according to the 1st charging, when a change in slopes of tangents to the negative electrode expansion curve at an initial state of charge (SOC) of less than 50%, at which the expansion curve increases, satisfies a particular value, a secondary battery manufactured including a negative electrode having the electrode density may exhibit excellent lifespan characteristics and excellent initial efficiency for the corresponding active material.

Abstract: Provided are a negative electrode for a rechargeable lithium battery including a negative active material and a conductive material wherein the negative active material includes graphite and an inorganic particle positioned on the surface of the graphite and having no reactivity with lithium, and the conductive material is included in an amount of greater than or equal to about 0.1 wt % and less than about 2 wt % based on the total amount of the negative active material and the conductive material, and a rechargeable lithium battery including the same.

Abstract: A rechargeable lithium ion battery including a negative active material, the negative active material including a carbon-based active material, and an electrolyte solution that includes a S?O-containing compound, the S?O-containing compound having a structure that is selected according to a G band/D band ratio of the carbon-based active material.

Abstract: Disclosed are an electrolyte for lithium secondary batteries including 10 to 50% by weight of a cyclic carbonate compound, and 50 to 90% by weight of a linear ester compound, based on the total weight of a non-aqueous solvent, wherein a content of ethyl propionate of the linear ester compound is 20 to 60% by weight, based on the total weight of the non-aqueous solvent, and a lithium secondary battery including the electrolyte and exhibiting superior low-temperature characteristics.

Abstract: This invention relates to the field of energy storage devices, and especially electrochemical energy storage devices including electrolytes comprising an ionic liquid, one or more solvents, and one or more salts of a Group 2 element. Effects on electrochemical performance of the electrolyte of each of the components of the electrolyte were systematically determined. In addition, interactions between the electrolytes and separator films were dissected to optimize electrochemical performance of coin cell batteries.

Abstract: An electrolyte for a lithium-ion battery and a lithium-ion battery. The electrolyte for a lithium-ion battery comprises a non-aqueous organic solvent, a lithium salt, and an electrolyte additive. The additive is selected from compounds of formula 1, wherein R1 is selected from unsaturated alkyls having three to six carbon atoms, and R2 is selected from alkylenes having two to five carbon atoms. Because the molecular structure of the additive comprises both unsaturated carbon-carbon bonds and cyanos, polymerization can occur on an electrode surface to form a compound containing multiple cyanos. The compound can be complexed with metal ions on a surface of a cathode material, thereby inhibiting electrolyte decomposition on an electrode surface to improve high-temperature storage and cyclability of a battery.