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 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: 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.

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: A current collector includes a current collector body and a lithiophilic layer applied on a surface of the current collector body. The lithiophilic layer has lithium affinity and comprises a lithiophilic material. The lithiophilic material comprises an internal structure and an external structure, and the internal structure is a cavity.

Abstract: A negative-electrode plate, a preparation method thereof, and a secondary battery, a battery module, a battery pack, and an electric apparatus including such negative-electrode plate are provided. The negative-electrode plate includes an alkali metal layer and a polymer film layer provided on at least one surface of the alkali metal layer. Surface resistivity of the polymer film layer gradually increases in a thickness direction of the polymer film layer away from the alkali metal layer. When the negative-electrode plate is used in a secondary battery, lithium dendrites can be effectively inhibited.