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: 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 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: 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: 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: 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 electrode assembly and a preparation method thereof, a secondary battery, a battery module, a battery pack, and an electric apparatus are provided. The electrode assembly provided by this application includes a positive electrode, a negative electrode, and a separator located between the positive electrode and the negative electrode, where the positive electrode and the separator contain a solid electrolyte, a liquid electrolyte is present between the separator and the negative electrode, and a mass ratio of the solid electrolyte to the liquid electrolyte is 1:1 to 8:1, optionally 2:1 to 6:1.

Abstract: The present invention discloses a bismuth oxide (Bi2O3)/bismuth subcarbonate ((BiO)2CO3)/bismuth molybdate (Bi2MoO6) composite photocatalyst, including a Bi2MoO6 photocatalyst, where Bi2O3 and (BiO)2CO3 nanosheets are introduced to a surface of the Bi2MoO6 through addition of Na2CO3 and roasting. The present invention also discloses a preparation method of the Bi2O3/(BiO)2CO3/Bi2MoO6 composite photocatalyst which is specifically implemented by the following steps: step 1: preparing a Bi2MoO6 photocatalyst; step 2: introducing Bi2O3 and (BiO)2CO3 nanosheets to a surface of the Bi2MoO6 photocatalyst obtained in step 1 through addition of Na2CO3 and roasting to obtain the Bi2O3/(BiO)2CO3/Bi2MoO6 composite photocatalyst. The photocatalyst of the present invention has no agglomeration, a wide responsive range of visible light, a significantly improved catalytic activity compared with a Bi2MoO6 alone, and excellent reusability.

Abstract: The present invention discloses a bismuth oxide (Bi2O3)/bismuth subcarbonate ((BiO)2CO3)/bismuth molybdate (Bi2MoO6) composite photocatalyst, including a Bi2MoO6 photocatalyst, where Bi2O3 and (BiO)2CO3 nanosheets are introduced to a surface of the Bi2MoO6 through addition of Na2CO3 and roasting. The present invention also discloses a preparation method of the Bi2O3/(BiO)2CO3/Bi2MoO6 composite photocatalyst which is specifically implemented by the following steps: step 1: preparing a Bi2MoO6 photocatalyst; step 2: introducing Bi2O3 and (BiO)2CO3 nanosheets to a surface of the Bi2MoO6 photocatalyst obtained in step 1 through addition of Na2CO3 and roasting to obtain the Bi2O3/(BiO)2CO3/Bi2MoO6 composite photocatalyst. The photocatalyst of the present invention has no agglomeration, a wide responsive range of visible light, a significantly improved catalytic activity compared with a Bi2MoO6 alone, and excellent reusability.