Effect of 1,8-Naphthosultone Additive on High Temperature Performance of Lithium Ion Batteries

摘要

In this paper, we calculate the Lowest Unoccupied Molecular Orbital (LUMO) level of the 1,8- naphthosultone (1,8-NS) by density functional theory. The effects of 1,8-NS on the high temperatureperformances of lithium ion batteries are evaluated by battery test system. The electrochemicalperformances are measured by cyclic voltammetry and electrochemical impedance spectroscopic. Byadding 1 wt % 1,8-NS into a commercial binary electrolyte of lithium ion battery, the initial dischargecapacity and cycle stability of lithium ion battery are improved significantly at 60 C. By X-rayphotoelectron spectroscopy analysis, we suggest that the improvement may be attributed to the 1,8-NSbeing reduced to form Li2S, R-SO2Li and R-SO3Li phase on the graphite electrode. Thus, the reductionproducts covered on the graphite electrode may reduce the resistance of solid electrolyte interphaseand suppress the battery swell.