Study On Solid State Lithium Ion Battery Materials For Lithium Nickel Manganese Oxide System Of Vehicle

High-energy density,high-power density,and technical guidelines for lithium-ion batteries have been formulated by various countries.Developing the next generation of high-safety,high-energy lithium-ion batteries is an urgent problem.At present,the energy density of LFP and LCO is still a wide gap between 300 Wh/kg.Moreover,the available energy density is 350 Wh/kg,which is far from the 2030standard of 500 Wh/kg.In addition,there is a potential danger of leakage of organic electrolyte in Lithium-ion battery,which causes environmental pollution,thermal runaway,flammable and explosive,resulting in personal safety threats and huge economic losses.These problems can be avoided with solid-state batteries.Solid-state batteries use solid-state electrolytes that do not contain organic solvents and can completely eliminate potential safety hazards such as corrosion,leak,and explosion.Moreover,the solid-state battery has a stable electrochemical window（up to 5V）,high power density,high energy density.High energy density and high safety requirements can be achieved.The main research content of this paper is on the macro background of the development of lithium-ion batteries.As well as the problems of traditional liquid lithium-ion batteries due to limitations in product configuration and technology.We started with high-performance cathode materials and high-conductivity electrolytes to solve problems.The electrolyte serves as a carrier for ion transport.Li_1.3Al_0.3Ti_1.7（PO₄）₃ used as a solid electrolyte with different preparation methods and calcination mechanisms.It is found that the morphologies of the LATP by the solid-phase method and the sol-gel method are quite different,and the materials prepared by the sol-gel method are higher conductivity at room temperature.To achieve the high-power output of the lithium-ion batteries,it is required that the battery material has a high rated voltage working platform and specific capacity.We have found that Li Ni_0.5Mn_1.5O₄ is prepared by a sol-gel self-propagating method,which changes the effect of lithium salts of different components on their physicochemical properties.Furthermore,we found that the material has a high working voltage platform of 4.6 V,and the initial discharge capacity reaches 127m Ah·g^-1,and the 0.2 C discharge rate after 20 cycles has a capacity retention rate of98%.Li Ni_1/3Co_1/3Mn_1/3O₂ is prepared by co-precipitation method,and plasma-assisted ball milling surface modification.We found that the first reversible capacity was155.9 m Ah·g^-1 and the Coulomb efficiency was 92.96%with the plasma-assisted ball milling surface modification.Moreover,at the 1 C discharge rate,the capacity has109.5 m Ah·g^-1,which is also superior to the uncomposited Li Ni_1/3Co_1/3Mn_1/3O₂.Plasma-assisted milling surface modification reduces interfacial problems with the solid electrolyte to increase the power density and energy density of the all-solid-state batteries.The solid electrolyte and electrode materials match the assembly of all-solid-state batteries to study the electrochemical properties.The initial discharge capacity of the solid-state battery reached 98.47 m Ah·g^-1,and the Coulomb efficiency was 62.06%.Under the condition of 1 C rate,the discharge capacity reached 63.27m Ah·g^-1.