Development of the Electrolyte Additive Suitable for 4.5 V High Voltage Lithium-rich Manganese-based Cathode Materials
Due to the market's anxiety about the mileage of new energy vehicles,high-voltage lithium-rich manganese-based cathode materials(LLOs)have attracted market attention as one of the new lithium-ion batteries with the greatest potential to resolve the energy density problem due to their high discharge specific capacity(＞250 mAh/g)and low-cost advantages.However,the traditional lithium ion electrolyte main salt lithium hexafluorophosphate(LiPF6)and carbonate solvent cannot withstand the higher operating voltage of the LLOs system,PF6-anion harmful side reactions,and carbonate solvent in the anode surface of the LLOs continue to decomposition and deposition of lithium-ion migration kinetics is limited,and the higher operating voltage under the LLOs defects in the material led to the precipitation of lattice oxygen,catalyzed by the decomposition of the electrolyte At the same time,the migration of TMs destroys the SEI,which seriously degrades the cycling performance and safety performance of the battery.
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