Highly reinforce the interface stability using 2-Phenyl-1H-imidazole-1-sulfonate electrolyte additive to enhance the high temperature performance of LiNi0.8Co0.1Mn0.1O2/graphite batteries

Abstract

This work develops 2-Phenyl-1H-imidazole-1-sulfonate (PHIS) as a multi-functional electrolyte additive for H2O/HF scavenging and film formation to improve the high temperature performance of LiNi0.8Co0.1Mn0.1O2/graphite batteries. After 450 cycles at room temperature (25 °C), the discharge capacity retentions of batteries with blank and PHIS-containing electrolyte are 56.03% and 94.92% respectively. After 230 cycles at high temperatures (45 °C), their values are 75.30% and 88.38% respectively. The enhanced electrochemical performance of the batteries with PHIS-containing electrolyte is supported by the spectroscopic characterization and theoretical calculations. It is demonstrated that this PHIS electrolyte additive can facilitate the construction of the electrode interface films, remove the H2O/HF in the electrolyte, and improve the electrochemical performance of the batteries. This work not only develops a sulfonate-based electrolyte but also can stimulate new ideas of functional additives to improve the battery performance.