Electrochemical studies of LiB compound as anode material for lithium-ion battery

Electrochemical studies of LiB compound were carried out for its application as anode for lithium-ion battery. The compound exhibited a reversible discharge–charge behavior between 0 and 0.75 V versus Li/Li+ with a first discharge capacity of 293 mA h g−1. Discharging to 1.0 V, the first discharge capacity of LiB compound was 660 mA h g−1, but a part of this capacity was irreversible. Impedance spectra were measured at several potentials corresponding to different discharge plateaus. The impedance spectra obtained below and above 0.8 V presented significantly different features. The solid electrolyte interphase layer (SEI) was formed below 0.8 V and assumed a good performance of LiB electrode in this potential range. The SEI was found to deteriorate above 0.8 V, which might be associated with the irreversible discharge capacity.