Abstract: A non-aqueous electrolyte is provided and includes an electrolyte salt, a non-aqueous organic solvent, and an additive. The non-aqueous organic solvent includes a carboxylate, and the additive comprises a compound represented by formula 1: where n is 0 or 1, A is selected from C or O, X is selected from R1 and R2 are each independently selected from H, R1 and R2 are not selected from H simultaneously, and X, R1 and R2 at least contain one sulfur atom. The non-aqueous electrolyte satisfies following conditions: 0.02?an/m?9, 0.01%?a?5%, 5%?m?70%, and 8%?n?25%; where a is a mass percentage content of the compound represented by the formula 1 in the non-aqueous electrolyte, in %; m is a mass percentage content of the carboxylate in the non-aqueous electrolyte, in %; and n is a mass percentage content of the electrolyte salt in the non-aqueous electrolyte, in %. A conductivity of the non-aqueous electrolyte at 25° C. is greater than or equal to 5 mS/cm.

Abstract: In order to overcome the problem of low ionic conductivity in the existing polymer solid electrolyte, the disclosure provides a solid electrolyte, comprising a polymer, a lithium salt and an additive, the additive is selected from an aprotic organic solvent with a carbon number lower than 10 and a relative dielectric constant higher than 3.6; the mass content of the lithium salt is 30%˜90%, and the mass content of the additive is 0.01%˜2%, based on the total mass of the solid electrolyte being 100%. Further provided is a polymer lithium ion battery comprising the solid electrolyte. According to the solid electrolyte of the disclosure, a trace amount of small molecule aprotic organic solvent with high dielectric constant is introduced as an additive, which can inhibit crystallization of the solid electrolyte, promote transmission of lithium ions in the electrolyte, and improve the ionic conductivity of the solid electrolyte at room temperature.

Abstract: In order to overcome the problems of battery expansion and capacity attenuation of the existing lithium ion battery during long-term high-temperature cycle, the application provides a lithium ion battery, which comprises a positive electrode, a negative electrode and a non-aqueous electrolyte, the non-aqueous electrolyte comprise an additive A, an additive B and an additive C; the lithium ion battery satisfies the following condition: 0 . 0 ? 1 ? 5 ? ( a + b + c ) × V ? 0.09 ; when the lithium ion battery meets the condition of 0.015?(a+b+c)×V?0.09, the problem of gas production of electrolyte during long-term high-temperature cycle can be effectively solved, and the expansion rate of battery can be effectively reduced.

Abstract: The application relates to the technical field of electrochemistry, in particular to a lithium ion battery, which comprises a positive electrode, a negative electrode and an electrolyte; the positive electrode comprises a positive electrode active material and a conductive agent, the positive electrode active material is a manganese-containing positive electrode material; the electrolyte comprises a compound represented by the following structural formula 1: The positive electrode active material, the conductive agent and the compound represented by structural formula 1 meet the following condition: 0 . 5 ? D ? r × T ? r w ? 1 ? 6 wherein, Dr and Tr are the ratios of the average particle size and specific surface area of the positive electrode active material to the conductive agent, respectively; w is the mass percentage of the compound represented by structural formula 1 in the electrolyte, and the unit is %.

Abstract: The present invention relates to the technical field of lithium batteries, and in particular, to a lithium battery separator and a lithium battery. The separator comprises a block polymer, the porosity of the separator is p, the mass percentage of the block polymer relative to the separator is w, and the relationship between the porosity p of the separator and the relative mass percentage w of the block polymer satisfies that (1?w)/3<p<25%. According to the lithium battery separator of the present invention, the block polymer is added, such that the separator also achieves the functions of the separator itself under the condition of a relatively small porosity, has good lithium-ion conduction characteristics, can reduce the thermal shrinkage rate thereof, and improves the safety performance.

Abstract: The present invention relates to an electrolyte, an additive thereof, a secondary cell, and an application thereof. An organic electrolyte according to a first aspect of the invention comprises a salt, a phosphate ester and a fluoroether, and does not comprise a carbonate ester. The salt is a lithium salt or a sodium salt. The electrolyte according to a second aspect of the invention comprises a base electrolyte and an additive. The base electrolyte comprises a sodium salt and a flame retardant solvent. The flame retardant solvent comprises a phosphate ester and a fluoroether. The additive comprises a fluorine-containing additive. The electrolyte and the secondary cell of the present invention increase safety.

Abstract: A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed on the positive electrode current collector. The positive electrode material layer includes a high-nickel positive electrode material represented by formula I and a compound represented by formula II: LiaNiqCoyMzO2, Formula I, where 0.9?a?1.2, 0.7?q?1, y?0, z?0, and q+y+z=1. M is selected from one or both of Mn and Al. R1, R2, and R3 are each independently selected from an alkyl group of 1 to 5 carbon atoms, a fluoroalkyl group of 1 to 5 carbon atoms, an ether group of 1 to 5 carbon atoms, a fluoroether group of 1 to 5 carbon atoms, an unsaturated hydrocarbonyl group of 2 to 5 carbon atoms.

Abstract: A lithium-ion battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode material layer, the positive electrode material layer includes a positive electrode active material, and the positive electrode active material includes LiNixCoyMnzL(1-x-y-2)O2, where L is Al, Sr, Mg. Ti, Ca, Zr, Zn, Si, Cu, V or Fe, 0.5?x?1, 0?y?0.5, 0?z?0.5, 0?x+y+z?1, and an upper limit voltage of the lithium-ion battery is ?4.2 V. The non-aqueous electrolyte includes a solvent, an electrolyte salt and a compound represented by formula 1: A-D-B-E-C, Formula 1. Based on a total mass of the non-aqueous electrolyte as 100%, the compound represented by the formula 1 is added in an amount of 0.01 to 5.0%.

Abstract: A positive electrode sheet includes a positive electrode current collector and a positive electrode material layer formed thereon. The positive electrode sheet has a potential range of greater than or equal to 4.25 V with respect to metal lithium. The positive electrode material layer includes a positive electrode active material doped or coated with metal elements and a compound represented by formula I. The positive electrode sheet satisfies: 0.3 ? ( m + n ) 100 ? k ? 59 ; and 50?m?10000, 50?n?10000, 2.8?k?3.8; where m is a content of the compound in the positive electrode material layer; n is a total content of the metal elements doped and coated in the positive electrode material layer; and k is a compacted density of the positive electrode material layer. A characteristic peak appears in a region having a retention time of 6.5 min to 7.5 min.

Abstract: Provided is a lithium iron phosphate battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode material layer with a compacted density of 2.3-2.8 g/cc, and the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises LiFePO4; the non-aqueous electrolyte comprises a solvent, an electrolyte salt, vinylene carbonate and a compound represented by Structural formula 1; an addition amount of the compound represented by Structural formula 1 is 0.01-5% based on a total mass of the non-aqueous electrolyte being 100%.

Abstract: Provided is a metal-sulfur battery, comprising a positive electrode material, a negative electrode material and an electrolyte, the positive electrode material comprises one of elemental sulfur and S-based compound; the electrolyte comprises a solvent and an electrolyte salt; and the electrolyte salt comprises one or more salts represented by structural formulas 1-3: wherein, R1 is selected from S or Se; R2 is selected from C, Si, Ge or Sn; M1 is selected from N, B, P, As, Sb or Bi; M2 is selected from Li, Na, K, Ru, Cs, Fr, Al, Mg, Zn, Be, Ca, Sr, Ba or Ra; R3 is selected from a carbon chain or an aromatic ring with part or all of hydrogen substituted by other elements or groups. The metal-sulfur battery provided by the disclosure can effectively solve the short circuit problem caused by metal dendrites on the negative electrode of existing metal-sulfur battery.

Abstract: The present application provides a secondary battery, including a positive electrode, a negative electrode with a negative electrode material layer, and a non-aqueous electrolyte, the negative electrode material layer comprises a negative electrode active material, and the negative electrode active material comprises a silicon-based material; the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additives comprises a compound represented by structural formula 1; wherein n is 0 or 1, A is selected from C or O, X is selected from R1 and R2 are each independently selected from H, R1 and R2 are not selected from H at the same time, and X, R1 and R2 comprise at least one sulfur atom; the secondary battery meets the following requirements: 0 . 2 ? 1 ? m * n * r S ? 40 ; and 40%?m?90%, 0.05%?n?2%, 1.2 g/cm3?r?1.8 g/cm3, 5%?S?30%.

Abstract: In order to solve the problem that the existing manganese-based positive electrode material battery has insufficient high-temperature cycle and high-temperature storage performances due to the dissolution of manganese ions, the present application provides a secondary battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, the positive electrode comprises a positive electrode material layer containing a positive electrode active material, the positive electrode active material comprises a manganese-based material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, and the additive comprises a compound represented by structural formula 1: the secondary battery meets the following requirements: 0.05?100×W×u/(q×s)?5; and 2.0 g/Ah?W?4.5 g/Ah, 0.05%?u?3.5%, 5%?q?65%, 10 mg/cm2?s?30 mg/cm2.

Abstract: The existing positive electrode material that is doped or coated with compound has the problem OF ion dissolution and battery performance deterioration at high temperature. To solve it, the invention provides a lithium-ion battery, comprising a positive electrode, a negative electrode and a non-aqueous electrolyte, wherein the positive electrode comprises a positive electrode material layer, the positive electrode material layer comprises a positive electrode active material, and the positive electrode active material comprises LiMO2, where M is selected from one or more of Ni, Co and Mn, and the positive electrode active material is doped with a compound containing metal element A and/or coated with a compound containing metal element A, the non-aqueous electrolyte comprises a solvent, an electrolyte salt and a compound represented by Structural formula 1. The lithium-ion battery provided by the invention could effectively improve the overall stability of the material.

Abstract: In order to overcome the problems in existing lithium ion batteries having high compactness and high-specific-surface-area negative electrodes of serious side reactions of electrolytes and high gas production, the present invention provides a lithium ion battery, comprising a positive electrode, a negative electrode, and a non-aqueous electrolyte. The negative electrode comprises a negative electrode material layer, the compaction density of the negative electrode material layer is greater than or equal to 1.4 g/cm3, and the negative electrode material layer comprises a negative electrode active material, and the non-aqueous electrolyte comprises a solvent, an electrolyte salt, a vinylene carbonate, a fluoroethylene carbonate, and an unsaturated phosphate represented by structural formula 1, and the electrolyte salt comprises LiPF6 and LiFSI. The lithium ion battery provided by the present invention has good cycle performance, high and low temperature storage performance, and lithium precipitation resistance.

Abstract: Provided are a non-aqueous electrolyte comprising a solvent, an electrolyte salt and a first additive, wherein the first additive is selected from at least one of the compounds as shown in structural formula 1: A-D-B-E-C, structural formula 1, wherein A, B, and C are each independently selected from the group consisting of cyclic carbonate groups, cyclic sulfate groups, cyclic sulfite groups, cyclic sulfonate groups, cyclic sulfone groups, cyclic sulfoxide groups, cyclic carboxylate groups or cyclic anhydride groups; D and E are each independently selected from single bond, or groups containing hydrocarbylene groups, ether bonds, sulfur-oxygen double bonds or carbon-oxygen double bonds; and the content of methanol in the non-aqueous electrolyte is 200 ppm or less. Further disclosed is a battery comprising the non-aqueous electrolyte.

Abstract: The application relates to the technical field of lithium ion batteries and discloses a lithium ion battery. The lithium ion battery comprises a positive electrode, a negative electrode, a separator arranged between the positive electrode and negative electrode, and a non-aqueous electrolyte; an active material of the positive electrode comprises LiFePO4, the non-aqueous electrolyte comprises an organic solvent, a lithium salt, vinylene carbonate and a compound represented by Formula (1), wherein R1 is one or more of chain, cyclic and aromatic group with 2-20 carbon atoms, and a compacted density of the positive electrode material is more than 2 g/cm3. The lithium ion battery provided by the application may obviously improve the cycle and storage performances at high temperature, greatly improve the capacity retention rate and capacity recovery rate of battery, obviously reduce the thickness expansion rate after high-temperature storage, and meanwhile, greatly reduce the precipitation of iron ions.

Abstract: This application provides a battery electrolytic solution, including an electrolyte salt and a non-aqueous organic solvent. The non-aqueous organic solvent includes a first organic solvent shown in a formula (I) and/or a second organic solvent shown in a formula (II): R1—S(?O)x—N(—R3)—R2 formula (I); and R1—S(?O)x—N(—R3)—S(?O)y—R4 formula (II). R1 and R4 are separately selected from fluoroalkyl, fluoroalkoxy, fluoroalkenyl, fluoroalkenyloxy, fluoroaryl, or fluoroaryloxy. R2 and R3 are separately selected from alkyl, alkoxy, alkenyl, alkenyloxy, aryl, or aryloxy. x is 1 or 2, and y is 1 or 2. A total content in mass of the first organic solvent and/or the second organic solvent in the electrolytic solution ranges from 10% to 90%. The electrolytic solution includes the first organic solvent and/or the second organic solvent of a high content in mass.

Abstract: Provided is a lithium ion battery, comprising a positive electrode containing a positive electrode material layer, a negative electrode and a non-aqueous electrolyte, the layer comprises a positive electrode active material, the material comprises LixNiyCozM1-y-zO2, M is at least one element selected from Mn and Al, the material is doped or coated with an element E, which is selected from one or more of Ba, Zn, Ti, Mg, Zr, W, Y, Si, Sn, B, Co, and P, a potential range of the positive electrode active material with respect to lithium metal is ?4.25V; the non-aqueous electrolyte comprises a solvent, an electrolyte salt and an additive, the additive comprises a compound represented by structural formula 1: the lithium ion battery meets the following requirements: 0.1?(H/T)×M/1000?10; and 80?H?150,0.005?T?0.8,0.05?M?3. The lithium ion battery provided by the application has a lower battery impedance and excellent high-temperature cycle performance.

Abstract: Provided is a secondary battery, comprising a positive electrode, the positive electrode comprises a positive electrode material layer, and the positive electrode material layer comprises a positive electrode active material and a compound represented by structural formula I: the positive electrode active material includes one or more of the compounds represented by Li1+xNiaCobM?1?a?bO2?yAy and Li1+zMncL2?cO4?dBd; the positive electrode material layer meets the following requirements: 0.05?p·u/v?15 wherein, u is the percentage mass content of element phosphorus in the positive electrode material layer, and the unit is wt %; v is the percentage mass content of element M in the positive electrode material layer, element M is selected from one or two of Mn and Al, and the unit is wt %; p is the surface density of one single surface of the positive electrode material layer, and the unit is mg/cm2.