Modified lithium battery diaphragm and preparation method thereof
By applying a ceramic coating containing potassium sodium tartrate on the lithium battery separator, failure and short-circuit problems caused by metal impurities in the battery are solved, the stability and safety of the battery are improved, and its service life is extended.
CN119725994APending Publication Date: 2025-03-28TIANJIN DG MEMBRANE
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Patent Information
- Application Number
- CN202411433018.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-03-28
AI Technical Summary
Technical Problem
Existing lithium batteries may introduce metal impurities in the electrolyte during the manufacturing process, resulting in reduced battery life and circulation efficiency, and there is a risk of failure and short circuit.
Method used
A modified lithium battery separator with ceramic coating containing potassium sodium tartrate on the PE or PP base film is used to form a soluble complex with metal ions such as copper and iron in the electrolyte to reduce free metal impurities.
Benefits of technology
It significantly reduces the content of metal impurities inside the battery, improves the stability and safety of the battery, extends the cycle life, reduces the risk of short circuits, and improves the mechanical strength and durability of the diaphragm.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to the field of batteries, and discloses a modified lithium battery diaphragm which comprises a ceramic coating containing sodium potassium tartrate tetrahydrate and coated on a PE (polyethylene) or PP (polypropylene) base membrane, the ceramic coating is prepared from the following components in parts by mass: 40 to 60 parts of ultrapure water, 30 to 45 parts of a ceramic material, 0.1 to 0.8 part of a dispersing agent, 1.2 to 3.6 parts of sodium potassium tartrate tetrahydrate, 6 to 12 parts of nano cellulose, 1.4 to 3.2 parts of an adhesive and 0.1 to 0.2 part of a wetting agent. Soluble complexes are formed by the potassium sodium tartrate and metal ions such as copper and iron in the electrolyte, so that the content of metal impurities in the battery is remarkably reduced. Compared with the technical scheme that the metal impurities in the electrolyte cannot be effectively controlled in the prior art, the problems of battery failure and short circuit risk caused by the metal impurities are successfully solved, the reliability of the battery is improved, and the service life of the battery is prolonged.
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