Aqueous binder for lithium ion battery negative electrode material and preparation method of aqueous binder

• Main Authors: WEI LIANGMING, MA LEI, NIU SULIN
• Format: Patent
• Language: Chinese; English
• Published: 29.08.2023
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention belongs to the field of lithium ion battery materials, and discloses a water-based binder for a lithium ion battery negative electrode material and a preparation method of the water-based binder. The main components of the adhesive are polyurethane (PU) and polydopamine (PDA). The invention provides a preparation method of the binder and a lithium ion battery prepared on the basis of the binder is subjected to electrochemical testing. The binder has the characteristics of low cost, strong viscosity and environmental protection, the prepared lithium ion battery has high specific capacity and excellent cycle performance, and the binder is especially suitable for application in the field of lithium ion battery silicon negative electrodes. 本发明属于锂离子电池材料领域，公开了一种用于锂离子电池负极材料的水系粘结剂及其制备方法。该粘结剂的主要成分为聚氨酯(PU)和聚多巴胺(PDA)。本发明提供该粘结剂的制备方法并且对基于此粘结剂制备的锂离子电池进行了电化学测试。该粘结剂具有成本低、粘性强、绿色环保的特点，所制备的锂离子电池时拥有较高的比容量和优异的循环性能，特别适用于锂离子电池硅负极领域的应用。