Development and Optimization of Electrolyte for High Nickel(NCM)Fast-charging Lithium Battery
As one of the two mainstream cathode materials in the market,high nickel(NCM)cathode materials are favored by high-end electric vehicles with long range due to their high energy density.With the maturity of high-nickel material system,the mileage pressure of new energy vehicles has been eased,and in order to make up for the short board of new energy vehicles,the improvement of charging and discharging efficiency has become the market expectation.Nowadays,electrode materials through ion doping and surface coating and other modification means to promote a new generation of electric vehicles to make efforts to come out,lithium-ion batteries,one of the"three giants"of the electrolyte,but by the traditional solvent system in the EC and the functional additives,EC because of the large viscosity and dielectric constant cannot meet the lithium-ion high-speed conduction,while the traditional functional additives in the construction of electrodes and functional additives in the electrolyte and functional additives in the construction of lithium-ion batteries.The EC cannot meet the high-speed conduction of lithium ions because of its large viscosity and dielectric constant,while the traditional functional additives are also weak in building the electrode/electrolyte compatible interface.In this paper,the solvent and additives are optimized to regulate the solvation structure of the electrolyte and construct an interfacial film at the anode and cathode with more lithium-ion transport kinetics,which will provide a development idea for the commercialization of high-nickel fast-charging electrolyte.
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