SEPARATOR, AND SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK AND ELECTRICAL APPARATUS USING THE SAME
The present application provides a separator, including first base films sequentially arranged in a stacked manner, a coating containing ceramic particles, graphene oxide and a binder, and a second base film. The separator in the present application has good electrolyte solution wettability, may effectively inhibit the growth of lithium dendrites, and has a small resistance, which may effectively improve the safety, dynamic and cycling performance of a corresponding battery. The present application further provides a secondary battery, battery module, battery pack and electrical apparatus using the separator.
1 . A separator, comprising first base films sequentially arranged in a stacked manner, a second base film, and a coating containing ceramic particles, graphene oxide and a binder located between the first base films and the second base film.
2 . The separator according to claim 1 , wherein a mass ratio of the ceramic particles to the binder is 1:0.001-0.3.
3 . The separator according to claim 1 , wherein a mass ratio of a mass sum of the ceramic particles and the binder to the graphene oxide is 2-11:1.
4 . The separator according to claim 1 , wherein a mass ratio of the graphene oxide to the ceramic particles is 1:1.5-11.
5 . The separator according to claim 1 , wherein
the graphene oxide is a graphene oxide plate, and optionally, a largest lateral dimension of the graphene oxide plate is 0.01-10 μm.
6 . The separator according to claim 1 , wherein
the ceramic particles are selected from one or more of oxides, nitrides or oxysalts of the following elements: Si, Fe, Sn, Ti, Cu, Mg, Ge, Zn, Zr and B.
7 . The separator according to claim 1 , wherein a particle size of the ceramic particles is 0.01-10 μm.
8 . The separator according to claim 1 , wherein the binder is selected from one or more of dopamine hydrochloride, polyvinylidene fluoride, polytetrafluoroethylene, a vinylidene fluoride-tetrafluoroethylene-propylene terpolymer, a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, fluorinated acrylate, butadiene styrene rubber, sodium polyacrylate, polymethylacrylic acid, polyacrylamide, polyvinyl alcohol, sodium alginate, carboxymethyl chitosan, and sodium carboxymethylcellulose.
9 . The separator according to claim 1 , wherein a thickness of the coating is 0.1-10 μm.
10 . The separator according to claim 1 , wherein the first base film and the second base film are each independently selected from one or more of polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl chloride, polyamide, and polyester.
11 . The separator according to claim 1 , wherein the first base film and/or the second base film are subjected to a wetting treatment with a graphene oxide dispersion.
12 . The separator according to claim 1 , wherein a thickness of the first base film and/or the second base film is 3-30 μm.
13 . The separator according to claim 1 , wherein the separator satisfies: ρ s ≤10 7 mΩ·cm, wherein ρ s represents an ionic resistivity of the separator.
14 . A secondary battery, comprising the separator according to claim 1 .
15 . A battery module, comprising the secondary battery according to claim 14 .
16 . A battery pack, comprising the battery module according to claim 15 .
17 . An electrical apparatus, comprising the battery pack according to claim 16 .