Novel Preparation, Characterization, Property of Lithium Bis(oxalate) Borate

A novel preparation method of lithium bis(oxalato)borate (LiBOB) called acetonitrile solution method was introduced. Lithium source was firstly pretreated by P204 extraction resin. Then Li2CO3 was reacted with H3BO3 and H2C2O4 directly in acetonitrile solution. As-prepared LiBOB was finally purified in ethylene glycol di-methyl ether (C4H10O2). The synthesized LiBOB was characterized by infrared spectrum, X-ray diffraction (XRD) pattern, atomic absorption and ion chromatography. Thermal stability capability of as-synthesized LiBOB was analyzed by differential thermal analysis and thermogravimetry. The results indicate that the as-synthesized LiBOB has higher purity, lower impurity contents and better thermal stability than commercialized LiBOB, the purity of the as-synthesized LiBOB reaches 99.95%.