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Lithium iron phosphate and ternary: The topic of energy density cannot be separated, and different materials require full equipment investment
At present, the mainstream positive electrode materials for power lithium batteries in China are divided into two categories: lithium iron phosphate and ternary. Among them, lithium iron phosphate is currently the safest positive electrode material for lithium batteries, with a cycle life of usually over 2000 times. In addition, due to the decline in price and technical threshold brought about by industrial maturity, many manufacturers consider using lithium iron phosphate batteries due to various factors. However, there are obvious shortcomings in the energy density of lithium iron phosphate batteries. Currently, BYD, the leader of lithium iron phosphate batteries, has a single cell energy density of 150Wh. By the end of 2017, BYD is expected to increase the energy density to 160Wh. In theory, the energy density of lithium iron phosphate is difficult to exceed 200GWh.
Ternary polymer lithium batteries refer to lithium batteries with nickel cobalt manganese oxide as the positive electrode material. The actual proportion of nickel cobalt manganese can be adjusted according to specific needs. Due to the higher energy density of ternary lithium batteries (currently, the energy density of ternary lithium batteries in leading power lithium battery manufacturers such as CATL can generally reach 200Wh/kg-220Wh/kg, and the industry predicts that the energy density of individual cells of ternary batteries will reach the level of 300Wh/kg by 2020), the passenger car market has begun to shift towards ternary lithium batteries, and in buses with higher safety requirements, lithium iron phosphate is more favored. With the development of all electric passenger vehicles, ternary lithium batteries are occupying an increasingly important position.
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