Self-extinguishing composite binder for lithium ion battery and lithium ion battery

• Main Authors: LIU LEI, CHEN RUNJI, YANG HUILIN, MAI YAOWEI, MIKI KAZUYUKI, ZHOU SHUCONG, ZOU ZEXIN, YANG JINLONG, DU ZEJIAN, PAN CHUYE
• Format: Patent
• Language: Chinese; English
• Published: 09.09.2022
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention discloses a self-extinguishing composite binder for a lithium ion battery and the lithium ion battery. The composite binder is obtained by adding ammonium polyphosphate and polyacrylic acid into a solvent to prepare a mixed solution and then carrying out heat treatment. According to the invention, the flame-retardant characteristic of ammonium polyphosphate is combined with the characteristic that polyacrylic acid can inhibit volume expansion, so that a stable SEI film is formed on the surface of the prepared lithium ion battery in the cycle process, and the electrochemical performance of the lithium ion battery is greatly improved while the flame retardance of the battery is improved; in addition, after ammonium polyphosphate and polyacrylic acid are heated, due to interaction of hydrogen bonds, cross-linking reaction can occur to form a three-dimensional network structure, so that the structural stability of the battery is also remarkably improved. 本发明公开了一种自熄灭的锂离子电池用复合粘结剂及锂离子电池。所述复合粘结剂是将聚磷酸铵和聚