Separator and electrochemical device
AssigneeNingde Amperex Technology Limited
InventorXinhui Zhou
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Abstract
The application provides a separator and an electrochemical device. The separator includes: a porous substrate; a first coating layer including a material that reversibly intercalation and deintercalation of lithium; and a second coating layer including one or both of inorganic particles and a polymer, wherein the first coating layer is arranged between the porous substrate and the second coating layer. According to the application, the first coating layer is arranged on one or both surfaces of the porous substrate, and therefore the safety performance, rate performance, and cycle performance of the electrochemical device are improved.
Claims30
A separator, comprising:
- a porous substrate;
- a first coating layer, comprising a material that reversibly intercalation and deintercalation of lithium;
- and
- a second coating layer, comprising at least one of inorganic particles and a polymer,
- wherein the first coating layer is arranged between the porous substrate and the second coating layer.
A method of preparing a separator, comprises steps of:
- dissolving a first binder into a solvent to form a first solution;
- dissolving a second binder into a solvent to form a second solution;
- adding the material that reversibly intercalation and deintercalation of lithium into the first solution and mixing them to obtain a first slurry;
- adding one or both of the inorganic particles and the polymer into the second solution and mixing them to obtain a second slurry;
- coating the first slurry onto at least one surface of the porous substrate to form a first coating layer;
- and
- coating the second slurry onto the surface of the first coating layer.
Dependencies are inferred from the claim text.