Lithium nitrate sustained-release film, preparation method and application thereof
The preparation of lithium nitrate slow-release membranes by casting method solves the problems of high cost and low solubility of existing LiNO3 slow-release membranes, and significantly improves the protective effect and electrochemical stability of Al foil in Li-Al batteries.
CN119264488BActive Publication Date: 2026-06-02NORTHWESTERN POLYTECHNICAL UNIV
Patent Information
- Authority / Receiving Office
- CN Β· China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NORTHWESTERN POLYTECHNICAL UNIV
- Filing Date
- 2024-11-13
- Publication Date
- 2026-06-02
AI Technical Summary
Technical Problem
Existing LiNO3 slow-release membranes suffer from high cost, complex preparation process, low lithium nitrate solubility, poor protection effect on Al foil in Li-Al batteries, and insufficient electrochemical stability.
Method used
A lithium nitrate sustained-release membrane was prepared by casting. A high-concentration lithium nitrate sustained-release membrane was prepared by mixing a lithium nitrate solution with a polyvinylidene fluoride-hexafluoropropylene copolymer solution and applied to the protection of Al foil.
Benefits of technology
This approach simplifies the production process, reduces costs, increases the solubility of lithium nitrate, and significantly improves the protection of Al foil and the electrochemical stability of Li-Al batteries.
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Figure CN119264488B_ABST
Abstract
This invention discloses a lithium nitrate sustained-release membrane, its preparation method, and its application, belonging to the field of sustained-release membrane technology. The preparation method includes the following steps: uniformly mixing a lithium nitrate solution and a polyvinylidene fluoride-hexafluoropropylene copolymer solution, and then preparing the membrane using a casting method. This invention uses lithium nitrate as a raw material and prepares the sustained-release membrane by casting it with polyvinylidene fluoride-hexafluoropropylene copolymer. The production process is simple and low-cost, and it can be rapidly formed at room temperature. The resulting sustained-release membrane can effectively protect Al foil, preventing Al corrosion, and its application effect is significant. By introducing lithium nitrate using ethylene glycol dimethyl ether, the solubility of lithium nitrate is maximized, resulting in a high-concentration lithium nitrate sustained-release membrane. Applying this membrane to protect against Al corrosion can more effectively protect Al foil and improve the performance stability of Li-Al batteries.
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