In-situ polymerization of p-sulfonated allyl phenyl ether coated graphite electrode for Lithium ion battery

In the field of lithium-ion energy storage, the graphite electrode plays a critical role as a key component of the lithium-ion battery. However, the naturally formed solid electrolyte interface (SEI) film on the electrode/electrolyte surface is susceptible to cracking, fracture, or dissolution, ultimately leading to a reduction in battery performance. The construction of a stable artificial SEI film is one of the key strategies to obtain high performance graphite electrodes. Herein, a p-sulfonated polyallyl phenyl ether coated graphite electrode (AG@SPAPE) was prepared by in-situ electrochemical polymerization and the coating amount was optimized. The prepared AG@SPAPE has the best electrochemical performance at a coating amount of 1 wt%. The first cycle discharge specific capacity reaches 284.3 mAh·g−1 at 0.2C. The discharge specific capacity remains 175.1 mAh·g−1 after 296 cycles. The introduction of SPAPE into the electrode causes it to form a polymer artificial SEI, which effectively inhibits electrolyte decomposition and improves battery performance.