Effect of Lithium Bis(oxalato) Borate Additive on Electrochemical Performances of 5V Class Cathodes at 60°C

摘要

Spinel LiNi_(0.5)Mn_(1.5)O_4 material is one of the promising cathode materials for high energy density of lithium-ion batteries because of its high voltage, acceptable stability, and good cycling performance. However, these 5V class cathode has been noticed to be unwanted interfacial reaction with electrolyte at the high voltage. In this study, the positive impact of an electrolyte additive LiBOB on electrochemical performances of LiNi_(0.5)Mn_(1.5)O_4 cathodes at 60°C will be discussed. In addition the oxidative decomposition of electrolytes at the cathode surface was investigated at various charged states by means of X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM).