Preparation method and application of modified polyacrylic high-toughness adhesive and long-cycle-life lithium ion battery
CN122326136APending Publication Date: 2026-07-03XIAN SAFTY ENERGY TECH
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- XIAN SAFTY ENERGY TECH
- Filing Date
- 2026-03-31
- Publication Date
- 2026-07-03
AI Technical Summary
Technical Problem
Existing negative electrode binders in lithium batteries suffer from insufficient adhesion and poor flexibility. In particular, they are prone to cracking and powder shedding during high-pressure compaction and volume expansion, which affects battery performance.
Method used
By converting the salt-type carboxyl groups of polyacrylate into acid-type carboxyl groups and reacting them with flexible materials and catalysts, a graft copolymer of rigid main chain and flexible side chain is formed, thereby improving the flexibility and adhesion of the adhesive.
Benefits of technology
It significantly improves the toughness and adhesion of the binder, enhances the cycle performance and structural stability of lithium batteries, and extends the cycle life of the batteries.
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Smart Images
Figure CN122326136A_ABST
Abstract
This invention discloses a method for preparing a modified polyacrylic acid high-toughness binder, comprising the following steps: 1. Preheating and mixing polyacrylate, solvent, and strong acid solution; 2. Adding flexible material and catalyst to the mixture and heating and stirring; 3. Heating and stirring the uniform mixture to react, then cooling to obtain the modified polyacrylic acid high-toughness binder. This invention also discloses a method for applying the modified polyacrylic acid high-toughness binder to the negative electrode sheet of lithium batteries and for preparing long-cycle-life lithium-ion batteries. The modified polyacrylic acid high-toughness binder is used in the preparation of negative electrode sheets and the preparation of long-cycle-life lithium-ion batteries. This invention improves the flexibility and brittleness of polyacrylic acid by grafting flexible material onto the carboxyl groups of polyacrylic acid. The process is simple and low-cost, avoiding severe powder shedding during coating and rolling processes, improving the electrode rebound rate, and simultaneously enhancing the cycle performance of the battery.
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