High and low temperature performance of LiODFB electrolyte

The thermal stability of LiODFB/(EC+DMC+EMC) electrolyte and LiPF6/(EC+DMC+EMC) electrolyte,electrochemical window and stability with the aluminum foil at high and low temperature,and the cycle performance of LiFePO4/G(graphite) battery at 60 and -20 ℃ were studied by DSC,electrochemical workstations and battery test system.SEM was used to analyse the anode morphology after cycle,and the interaction mechanism between the electrolyte and electrode at high and low temperature was also investigated.The results show that LIODFB electrolyte is decomposed at 250 ℃,while LiPF6 electrolyte has a decomposition temperature of 120 ℃.The electrochemical of LiODFB electrolyte and its stability with aluminum foil are superior to those of LiPF6 electrolyte at -20 and 60 ℃.LiODFB battery with LiFePO4/G for electrode has better capacity retention than the LiPF6 battery at -20 and 60 ℃.LiODFB electrolyte is benefitial to the formation of the SEI film on the G electrode.However,LiPF6 electrolyte would generate HF to destroy the SEI film at high temperature.