Safety of lithium iron phosphate battery is higher than that of lithium ternary battery

The energy density of lithium iron phosphate batteries is far less than that of lithium ternary batteries, but its safety is generally considered to be better than lithium ternary batteries. First, energy density. At present, the subsidy standard for new energy vehicles depends on the energy density of the battery system. The specific policy is that when the energy density of the battery system exceeds 120 Wh / kg, it can enjoy 1.1 times the subsidy. Between 90 Wh / kg and 120 Wh / kg can only enjoy double subsidies.

It is understood that it is not difficult to improve the lithium iron phosphate battery on the market to reach 90 W/kg, but few companies have to achieve 120 W/kg. BYD has been focusing on lithium iron phosphate batteries and is at the leading domestic level in this technology. It has been rumored that BYD has developed a high-energy density lithium iron phosphate battery with a capacity density of 150 Wh / kg. This level is almost equal to the three-element lithium battery.

Whether the rumors are true or not is not discussed for the time being, but BYD, the industry leader, can only achieve such a level. It can be seen that the difficulty of using lithium iron phosphate batteries to obtain 1.1 times the subsidy is not small, but this problem is for three lithium batteries. It is easy to achieve.

In addition, it can be seen from the production capacity planning of several power cells in 2017 that the capacity expansion of the three-part lithium battery is particularly evident. Even companies such as BYD, which used to love lithium iron phosphate batteries, have maintained iron phosphate in 2017. Lithium production capacity remains unchanged, and the three-part lithium battery is expanded.

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