Hydrolysis and influences on physical and chemical properties for lithium battery electrolyte LiODFB

The chemical structure,composition and phase of the self-made high-purity LiODFB were systematically analyzed and characterized by Fourier transform infrared(FTIR) and elementary analysis.The sensitivity of water and physicochemical properties of LiODFB and LiPF6 were investigated by water exposure experiment and battery performance test.The results show that the element contents of the self-made sample are basically consist with the theoretical values,and the purity is 99.93%.The infrared absorption peaks of the chemical bonds are all present,and no other impurity peaks exist.LiODFB would first absorb moisture to form LiODFB.H2O,then be hydrolyzed to produce complex compound when exposed to 25 ℃,50% humidity.Under the same conditions,LiPF6 is decomposed into LiF,Li3PO4 and HF.The battery performance of the exposed sample gets worse while prolonging the exposed time of the LiODFB and LiPF6.The capacity and capacity retention of the battery with LiODFB-based electrolyte are obviously better than those of the battery with LiPF6-based electrolyte.