All along, the energy density of ternary lithium batteries and lithium iron phosphate batteries compared to more advantageous, although lithium iron phosphate batteries have a longer cycle life, but lithium iron phosphate batteries in the energy density of the short board is still very obvious, now lithium iron phosphate battery capacity density is generally still in the 150Wh/kg, even if you do better, is also in the 160Wh/kg left, this and ternary batteries 200Wh/kg energy density, compared to a large gap. Ternary lithium battery is so hot because it has a very high energy density, cycle performance and consistency is also better than lithium iron phosphate.
The energy density of ternary lithium batteries has greater development possibilities compared to lithium iron phosphate batteries
Lithium iron phosphate battery energy density is far less than the ternary lithium battery, but its safety is generally considered to be better than the ternary lithium battery. First of all, the energy density, at present, the new energy vehicle subsidies depending on the energy density of the battery system, the specific policy is that when the battery system energy density of more than 120Wh/kg, you can enjoy 1.1 times the subsidy, between 90Wh/kg and 120Wh/kg can only enjoy 1 times the subsidy.
It is understood that the lithium iron phosphate battery on the market is improved to reach 90Wh/kg is not very difficult, but to do 120Wh/kg few companies. Now the energy density of lithium iron phosphate batteries are generally in the 150Wh/kg or so, even if you do better, is also in the 160Wh/kg left, this and ternary batteries 200Wh/kg energy density, compared to a large gap. The upcoming production of 32131 high energy density cylindrical lithium iron phosphate battery, the energy density of a single unit to 180Wh/kg, the use of the battery passenger cars, the range can reach more than 300km.
At present, the domestic mainstream lithium iron phosphate energy density of only about 150Wh/kg, according to domestic battery industry experts analysis, within the next few years, lithium iron phosphate energy density can reach 300Wh/kg of hope is very slim.
High energy density is the biggest advantage of ternary lithium batteries, so the same weight of the battery pack battery capacity is greater, the car will run farther, and faster. BYD lithium iron phosphate battery monomer energy density of 150Wh/kg, BYD ternary lithium battery energy density reached 200Wh/kg. can be seen, ternary lithium materials than lithium iron phosphate is still a very obvious advantage.
Ternary lithium-ion power battery has seen the energy density of the "ceiling", high nickel materials, carbon silicon cathode lithium battery monomer energy density should be the highest in about 300Wh / kg, positive and negative no more than 20Wh / kg. ternary lithium battery monomer energy density is close to the limit, it is difficult to have a major breakthrough. More and more domestic and foreign enterprises and research institutions will focus on solid-state batteries.
BYD E5, for example, lithium iron phosphate version of the battery capacity of 52kWh, weight 517kg, range of 350km. After the replacement of the ternary lithium battery battery capacity of 61kWh, the weight in turn reduced to 444kg, range also rose to 400km.
Compared with lithium iron phosphate batteries, Tesla MODELS use ternary lithium batteries in weight energy density is much higher, about 200Wh/kg, which means that the same weight of ternary lithium batteries than lithium iron phosphate range longer. However, its disadvantages are also obvious, when its own temperature of 250-350 ℃, the internal chemical composition will begin to decompose, so the battery management system to put forward very high requirements, the need for each battery separately installed safety devices.
It is not difficult to find, although lithium iron phosphate batteries in high temperature resistance and cycle life is slightly better, but ternary lithium batteries in energy density, range, low-temperature performance and charging efficiency and other aspects of the obvious advantages, and shows greater development possibilities.
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