Study of LiBOB compound synthesis by vacuum process as lithium ion battery electrolytes

Abstract

Lithium bis (oxalato) borate or LiBOB is potential candidate to substitute LiPF6 which has many problems in lithium ion batteries. Many studies have been synthesized of electrolyte salt LiBOB to improve performance as electrolyte lithium ion batteries. In this paper we have studied the synthesis of compounds LiBOB undergoing pre-heat treatment in a vacuum. LiBOB was synthesized by mixing technical grade raw materials H2C2O4.2H2O, LiOH and H3BO3. The mixture H2C2O4.2H2O and LiOH was preheated at 60 °C for 2 h before adding H3BO3 in several time to be mortared in vacuum dryer, the mixture of the three starting materials was preheated in two steps at 70 °C for 6 h and the third step of preheating at a temperature of 100 °C. This powder was then characterized using XRD, FTIR and BET. The characterization results of LiBOB compared to commercial LiBOB powder. The XRD analysis results showed that the sample have formed LiBOB and LiBOB hydrate phase, while FTIR analysis results show the formation of functional groups of LiBOB. In addition, the BET results shows the surface area of synthesized LiBOB is 75.994 m2/g, close the surface area of commercial LiBOB, i.e 108.776 m2/g.