Comparison of lithium iron phosphate battery and ternary lithium ion battery

by:CTECHi     2021-09-10
In an interview with the media, Wang Binggang, the leader of the supervision and consulting expert group for the major projects of energy-saving and new energy vehicles of the Ministry of Science and Technology, said: The development of lithium iron phosphate batteries has reached a bottleneck period. The replacement of lithium iron phosphate batteries with ternary lithium ion batteries will be The historical trend of the development of power lithium batteries for new energy vehicles. Take a pure electric vehicle currently on the market as an example. It claims that the battery energy density can reach 157 watt-hours/kg. In fact, that is just the energy density of the single battery. According to the existing technology, the energy density of the single battery is It is reduced to 100 watt-hours/kg, and finally the battery pack is applied to the car, and the energy density ratio shown on the actual road is only about 90. The energy density ratio of the ternary lithium-ion battery can reach 170 Wh/kg, which means that with the same weight of the battery, the car can travel about 1/3 more distance. The 'Energy-saving and New Energy Automobile Industry Development Plan (2012-2020)' announced by the State Council clearly states that the energy density requirement of battery modules is greater than 150 Wh/kg, and lithium iron phosphate batteries cannot meet the existing requirements. At the same time, the safety issues of ternary material lithium-ion batteries have been improved and resolved. The current ternary materials adopt a 1:1:1 structure, which is a kind of ternary materials with a more stable structure and a more mature preparation. At present, ternary lithium-ion batteries are manufactured through electrolyte and special ceramic diaphragm technology. The ceramic diaphragm can isolate the short-circuit source when the battery is short-circuited, thereby significantly improving the safety performance of the ternary lithium-ion battery. The first interesting example is BMW. BMW chose lithium iron phosphate batteries for its joint venture brand Zeno’s battery technology, while its i3 and i8 chose ternary lithium-ion batteries. Zeno is a product of policy, while i3 is BMW’s new energy layout. An important piece on the board, Zeno and i3 can show BMW's attitude whether it is the cruising range or the degree of importance. Another interesting fact is that the EV200 and ES210 electric vehicles listed by BAIC New Energy have a core reason why they are equipped with a ternary lithium-ion battery, while the previous BAIC E150EV is equipped with a lithium iron phosphate battery. It shows that BAIC New Energy may abandon lithium iron phosphate and use ternary lithium as an important technical route. In comparison, ternary polymer lithium-ion batteries do have characteristics that are better than lithium iron phosphate batteries. At present, all our JMC vehicles use ternary lithium-ion batteries, while JAC vehicles use lithium iron phosphate batteries. . Jiangling New Energy and Tesla Motors use the same Sanli lithium-ion battery. Compare the advantages of lithium iron phosphate and other batteries (JAC uses lithium iron phosphate). Charging is equivalent to maintaining the battery. The other is damaging the battery life. As long as we are free It can be recharged, and the battery is guaranteed for 8 years
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