Lithium Iron Phosphate And Ternary Lithium Batteries

At present, the positive electrode materials of domestic mainstream power lithium-ion batteries are divided into two types: lithium iron phosphate and ternary. Among them, lithium iron phosphate is currently the safest cathode material for lithium-ion batteries, and its cycle life is usually more than 2,000 times. In addition, due to the decline in price and technical threshold due to the maturity of the industry, many manufacturers consider it due to various factors. Lithium iron phosphate batteries will be used. However, lithium iron phosphate batteries have obvious defects in energy density. At present, the energy density of BYD lithium iron phosphate single cell, the leading lithium iron phosphate battery, is 150Wh. By the end of 2017, BYD expects to increase the energy density to 160Wh. The energy density of lithium iron is difficult to exceed 200Gwh.

Ternary polymer lithium-ion battery refers to a lithium-ion battery in which nickel-cobalt-manganese oxide is used as the positive electrode material, and the actual ratio of nickel-cobalt-manganese can be adjusted according to specific needs. As the ternary lithium-ion battery has a higher energy density (the energy density of the ternary lithium-ion battery of the first-class power lithium battery manufacturers such as Ningde Times can generally reach 200Wh/kg-220Wh/kg, the industry expects that by 2020, the ternary battery unit The energy density of body cells will reach the level of 300Wh/kg), the passenger car market has begun to turn to ternary lithium-ion batteries, and lithium iron phosphate is more popular in passenger cars with higher safety requirements. With the development of all-electric passenger vehicles, ternary lithium-ion batteries are occupying an increasingly important position.

The energy density and cost of the two materials are different, and different cars and different car companies have different choices. The production process of the two is roughly the same, and the difference is mainly reflected in the use and ratio of materials, the specific process parameters are quite different, the equipment cannot be produced on the same line, and the cost of simply transforming and switching output is high (ternary materials are relatively high) Vacuum dehumidification and other requirements are strict, and the previous lithium iron phosphate production line basically did not require dehumidification), so many battery cell factories will simultaneously deploy and purchase equipment separately in production planning.