PHOTO-CROSS-LINKABLE POLYACRYLIC ACID BINDER FOR SILICON ANODES

摘要

The present invention relates to a photoreactive polymer capable of being used as a binder for a silicon-based negative electrode of a lithium ion battery. A new photo-crosslinkable polyacrylic acid polymer substituted with a photoreactive benzophenone forms a three-dimensional C-C bond network between a benzophenone residue and a PAA main chain by UV irradiation, thereby forming an irreversible crosslinking structure. Therefore, the new photo-crosslinkable polyacrylic acid polymer shows minor volume expansion and excellent cycle performance even after lithium substitution.