Lithium ion battery material analysis

(1) New new cathode materials are developed through breakthroughs in key technologies such as cobalt nickel manganese hydroxide precursor synthesis, lithium iron phosphate nanocrystallization, lithium iron phosphate doping, lithium iron phosphate carbon-coated, and lithium manganate surface layer modification Low-cobalt high-capacity cobalt nickel manganese ternary cathode material, lithium iron phosphate cathode material and modified lithium manganate cathode material were successfully applied to high specific energy small lithium-ion batteries for mobile electronic terminal equipment and high power tools Small power batteries, small power batteries for light electric vehicles, and lithium-ion power batteries for new energy vehicles. The breakthrough of new cathode material technology has laid a solid foundation for the development of China's small lithium-ion battery industry and the development of power battery industry. The new cathode material has an annual production capacity of 50,000 tons, which not only meets the needs of domestic battery companies, but also becomes a major supplier in the international market.

(B) The new anode material takes high-capacity, high-power nano-composite anode material as the main research and development goal, using the nano-scale effect of the material to develop an in-situ composite nano-micro composite anode material with a capacity of 600mAh / g, about 1.8 times of the existing commercial anode materials, and the capacity attenuation after 500 cycles is less than 20%. It is used to assemble 35Ah high-power batteries with a power density of up to 1500W / kg. The energy density of 18650 and 3450 batteries reaches 238Wh / kg. And showed good circulation. A production line with an annual output of 110 tons of high-performance anode materials has been built, of which the annual production capacity of carbon nanotubes / nanocarbon fibers is 20 tons, the annual production capacity of nanopore hard carbon balls is 60 tons, and the annual production capacity of Lantern Festival anodes is 30 tons.

(3) The new electrolyte and separator materials have broken through the synthesis method and preparation technology of the new generation lithium salt-bis (fluorosulfonimide) lithium conductive material for power lithium-ion batteries, and developed secondary lithium (ion) batteries The use of low-viscosity ionic liquid electrolyte materials has made China the second country to successfully master the preparation technology of this material except Japan. Mastered the production technology of lithium hexafluorophosphate electrolyte lithium salt, formed a 1,000-ton / year demonstration production of lithium hexafluorophosphate, and realized large-scale production. The single-layer diaphragm technology has been successfully industrialized and applied to cell phone batteries in batches, breaking the monopoly of a few countries, and the composite diaphragm technology has also achieved preliminary breakthroughs. The breakthrough of new electrolyte and separator materials has solved China's long-term dependence on imports, which can effectively promote the steady and healthy development of China's power lithium-ion batteries, electric vehicles and other related industries.

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