Separator and lithium-ion battery
AssigneeNingde Amperex Technology Limited
InventorsDongyang Guo, Gengjin Kong, Kebing Guo, Xinghua Tao
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Abstract
A separator and a lithium-ion battery. The separator includes a porous substrate, and a first coating layer arranged on at least one surface of the porous substrate, wherein the first coating layer includes an aromatic polyamide. An aramid coating layer is used; the aromatic polyamide in the aramid coating layer swells or plasticizes under the action of a solvent and a lithium salt in the electrolyte at high temperature or normal temperature, to increase the elongation of the separator, while improving the safety performance of the lithium-ion battery by interaction between the aramid coating layer and the electrode active material or the binder.
Claims16
A lithium-ion battery, comprising:
- a separator;
- and
- an electrolyte;
- wherein the separator comprises a porous substrate and a first coating layer, the first coating comprises a copolyaromatic polyamide, and the electrolyte comprises a linear ester compound;
- and
- wherein the first coating layer has a thickness of 0.5 μm to 1 μm;
- wherein the copolyaromatic polyamide is a polymer comprising structural units resulting from polymerization of a diamine aromatic compound with a dibasic acid chloride aromatic compound;
- wherein the diamine aromatic compound comprises one or more selected from the group consisting of compounds represented by the following chemical formulas:
Dependencies are inferred from the claim text.