Abstract: Embodiments of the present application provide a lithium metal negative electrode, a preparation method therefor and related lithium metal battery and device. The lithium metal negative electrode may comprise: a negative electrode current collector; at least one lithium-based metal layer provided on at least one surface of the negative electrode current collector; and an ion-conducting polymer modification layer, which is located on the surface of one of the at least one lithium-based metal layer and comprises at least catalytic amount of a Lewis acid, the Lewis acid containing cations of a metal capable of forming an alloy-type active material with lithium.

Abstract: An electrolyte includes a solvent and a prelithiation additive, where the prelithiation additive is selected from at least one of the following: lithium salt with oxalate, lithium oxide, and lithium peroxide, and the solvent includes at least one compound of formula (I). R1 is C1-6 fluoroalkyl; R2 is a hydrogen atom, C1-6 alkyl, or C1-6 fluoroalkyl; and n represents 1 or 2.

Abstract: A negative electrode plate includes a negative electrode active material layer. The negative electrode active material layer includes a negative electrode active substance and lithium-philic nanoparticles capable of alloying with lithium. A secondary battery includes a positive electrode plate, the negative electrode plate, and a separator provided between the positive electrode plate and the negative electrode plate.

Abstract: A separator includes a porous substrate and a polymer coating. The polymer coating covers at least one surface of the porous substrate, and pores of the porous substrate are not completely filled by the polymer coating. The polymer coating has lithium ion conductivity. A preparation method of separator includes mixing preparation raw materials of a polymer coating to prepare a precursor solution, applying the precursor solution onto at least one surface of a porous substrate, and polymerizing the precursor solution to prepare the polymer coating.

Abstract: An electrolyte includes a solvent, where the solvent includes at least one cyclic ether of formula (I) and at least one linear ether of formula (II).

Abstract: Provided are a non-aqueous electrolyte, a secondary battery, a battery module, a battery pack, and an electrical device. The non-aqueous electrolyte includes orthocarbonate, chain carbonate, cyclic carbonate, and lithium salt, a mass content of the orthocarbonate is 10% to 80%, and at least one of the chain carbonate or the cyclic carbonate is fluoride. A central carbon atom of the orthocarbonate is bonded to four oxygen atoms, each of which is further bonded to an alkyl or halogenated alkyl chain, which plays an electron attraction role for lone pair electrons of the oxygen atoms, and increases steric hindrance surrounding the oxygen atoms, weakening the capability of the oxygen atoms in binding to lithium ions, and facilitating SEI film formation dominated by anion decomposition.

Abstract: Provided is an electrolyte, including a first solvent represented by formula I and a second solvent selected from one or more of formula II and formula III, where R1 is selected from C1-C6 fluoroalkyl; R2 is selected from a hydrogen atom, C1-C6 alkyl or C1-C6 fluoroalkyl; n represents 1 or 2; and R3 to R10 are each independently selected from a hydrogen atom, a fluorine atom, C1-C6 alkyl, or C1-C6 fluoroalkyl. The electrolyte of the disclosure can improve cycle stability and safety of the battery. A secondary battery including the electrolyte, a battery module, a battery pack, and an electrical device are also disclosed.

Abstract: A composite electrolyte, including a sulfide electrolyte, a polymer electrolyte, and a functional additive material are provided. In some embodiments, the functional additive material is selected from polymers represented by the following structural R1—O—R2-A. In some embodiments, R1 is selected from at least one of polyvinyl group, polypropylene group, polyacrylate group, polyvinylcarbonate group, polyacrylonitrile group, and polystyrene group; R2 is a straight-chain or branched alkyl group with 3-10 carbon atoms; A is selected from at least one aromatic hydrocarbon group of benzene group, biphenyl group, triphenyl group, naphthalene group, anthracene group, phenanthrene group, and pyrene group; and X is selected from at least one of hydrogen atom, halogen atom, mercapto group, hydroxyl group, amine group, and aldehyde group.

Abstract: An electrolyte for a lithium-ion battery, a lithium-ion battery, a battery module, a battery pack, and an apparatus are provided. The electrolyte includes an organic solvent, an electrolyte lithium salt dissolved in the organic solvent, and an additive, where the additive is a compound represented by following formula I. The electrolyte can inhibit generation of lithium dendrites in the lithium-ion battery, improve cycle performance of the battery, and also improve flame retardancy of the battery, thereby effectively resolving defects in the existing technology.

Abstract: An electrolyte containing a solvent including at least one compounds of formula I, wherein A1 is an oxygen atom or a single bond, A2 is a single bond or CHR4, R1 and R2 are each independently a hydrogen atom, C1-6 alkyls or a C1-6 fluoroalkyls, R3 and R4 are each independently a hydrogen atom, a fluorine atom, C1-6 alkyls or C1-6 fluoroalkyls, A1 and A2 cannot both be single bonds simultaneously, and only one of R1 to R4 includes a fluorine atom is described. The electrolyte can make a metal negative electrode secondary battery have good cycling performance and good discharge capacity retention at low temperature.

Abstract: Disclosed are a lithium metal composite electrode material for a lithium metal battery, a preparation method for the same, and an electrode, battery, battery module, battery pack and apparatus comprising the same. The lithium metal composite electrode material comprises: lithium metal particles and a lithium-containing conductive layer serving as a supporting framework, the supporting framework being filled with the lithium metal particles; wherein the lithium-containing conductive layer comprises an inorganic lithium compound and a lithium alloy.

Abstract: A composite electrolyte, including a sulfide electrolyte, a polymer electrolyte, and a functional additive material are provided. In some embodiments, the functional additive material is selected from polymers represented by the following structural R1—O—R2-A. In some embodiments, R1 is selected from at least one of polyvinyl group, polypropylene group, polyacrylate group, polyvinylcarbonate group, polyacrylonitrile group, and polystyrene group; R2 is a straight-chain or branched alkyl group with 3-10 carbon atoms; A is selected from at least one aromatic hydrocarbon group of benzene group, biphenyl group, triphenyl group, naphthalene group, anthracene group, phenanthrene group, and pyrene group; and X is selected from at least one of hydrogen atom, halogen atom, mercapto group, hydroxyl group, amine group, and aldehyde group.

Abstract: This application provides an electrolytic solution and a lithium metal battery containing the electrolytic solution. The electrolytic solution includes a lithium salt, an organic solvent, and an additive. The additive includes a sultam compound represented by Structural Formula I. R is selected from substituted or unsubstituted C1 to C10 hydrocarbyls, where a substituent is selected from a phenyl, C1 to C6 alkyls, or C1 to C6 alkenyls. X is a sulfur atom or a phosphorus atom. R1 and R2 each are independently selected from an oxygen atom, a fluorine atom, a chlorine atom, a bromine atom, and substituted or unsubstituted C1 to C10 hydrocarbyls. Both R1 and R2 are not oxygen atoms concurrently.

Abstract: A heating system includes first and second input ends, first and second battery modules, first switch and second switches, and a control unit. The first switch is connected between first terminals of the first and second battery modules. Second terminals of the first and second battery modules are connected to each other. The second switch is connected between the first input end and the first terminal of the second battery module. The second input end is connected to the first terminal of the first battery module. The first terminals of the first and second battery modules have a same polarity, and the second terminals of the first and second battery modules have a same polarity. The control unit is connected to the first and second switches, and configured to control the first and second switches to be turned on or off.

Abstract: A lithium coating composition includes a lithium-containing metal and a polymer chemically connected to a lithium surface of the lithium-containing metal, and the polymer has a structure shown in Formula I. Each occurrence of Rf independently represents a fluorine-substituted aliphatic group, each occurrence of X independently represents H or an electron-withdrawing group, each occurrence of Z independently represents O, S or NR11 where R11 is H or C1-3 alkyl, * indicates a site connecting a terminal group, n is an integer ?10, and at least one cyano group in the polymer forms a chemical connection with lithium in the lithium-containing metal.

Abstract: A heating method traction battery. The traction battery is connected to a switch circuit of a motor and configured to supply power to the motor via the switch circuit. The switch circuit includes multiple legs and the multiple legs are connected to the traction battery in parallel. The method includes: receiving a heating signal sent by a battery management system of the traction battery; and controlling, according to the heating signal, at least one of the multiple legs to form a short-circuit loop of the traction battery, the short-circuit loop being configured to discharge the traction battery and heat the traction battery during the discharging process.

Abstract: This application provides a polymer current collector, a preparation method thereof, and a secondary battery, battery module, battery pack, and apparatus associated therewith. The polymer current collector provided in this application includes polymer film layers, where the polymer film layers include a first polymer film layer and a second polymer film layer, a resistivity of the first polymer film layer is denoted as ?1, a resistivity of the second polymer film layer is denoted as ?2, and the current collector satisfies ?1>?2. The polymer current collector in this application can induce to deposit of lithium metal from a low conductivity side to a high conductivity side, avoiding risks of depositing lithium ions on the surface of the current collector and thereby increasing cycle life of lithium metal batteries.

Abstract: An electrode assembly includes a positive electrode plate containing a positive active material and a negative electrode plate. The positive electrode plate includes a positive bend portion and a positive flat straight portion connected to the positive bend portion. At least a part of the positive active material of the positive bend portion includes a polymer coating layer capable of obstructing migration of active ions. A ratio of an ionic conductivity ?1 of the first bend portion to an ionic conductivity ?2 of the positive flat straight portion satisfies 0 ? ?1/?2 < 1.

Abstract: An electrolytic solution includes a lithium salt, an organic solvent, and an additive. The additive is a salt with a formula of M1M2xOy. The M1 is selected from one or more of alkali metal element and NH4+. The M2 is selected from one or more of VB-VIII group elements in a fourth cycle of a periodic table of elements. x is in a range of 0.01-4, and y is in a range of 0.1-9.

Abstract: This application provides a battery, and a method and apparatus for curbing battery gassing, and pertains to the field of battery technologies. The battery includes a battery housing, a positive electrode plate, a negative electrode plate, and a non-aqueous electrolyte. A gas reducer is disposed inside the battery housing, the gas reducer includes at least one of alkali metal and alkali metal alloy, and the gas reducer is in no contact with or in non-electrical contact with the negative electrode plate. The apparatus is provided with the foregoing battery. The method for curbing battery gassing includes disposing the gas reducer inside the battery housing, such that the gas reducer is in no contact with or in non-electrical contact with the negative electrode plate. Such battery features simple configuration, no limitation from gas scale effect, timely degassing, and high degassing capacity.