In today's power battery market, mainly lithium iron phosphate batteries and lithium batteries based. The main features of the two are the differences in energy density and safety. The energy density is related to the battery life, and safety is one of the most important indicators of lithium batteries. Then we will introduce the difference and connection between the two lithium batteries from four aspects of energy density and safety, temperature adaptability, charge and discharge efficiency respectively:

Energy Density 

Lithium iron phosphate battery energy density than the ternary lithium battery a lot of difference, the current standard of subsidies for new energy vehicles battery pack system as an important indicator of energy density, the policy states that when the battery system energy density exceeds 120Wh / kg, you can enjoy 1.1 times Of subsidies, between 90Wh / kg and 120Wh / kg can only enjoy 1 times the subsidy. In this need to explain the name of the technology battery car battery pack power density reached 125Wh / kg. The company is located in:

Lithium iron phosphate battery cell energy density is usually between 90-120Wh / kg, while the ternary lithium battery cell energy density can reach 200Wh / kg or so, we can see the ternary lithium battery energy density advantage is more clear, which is also in recent years A large number of domestic production line on the ternary lithium battery, the reason, plus Japan and South Korea in the direction of the technology of ternary lithium battery adhere to the market, injecting strong confidence. The company is located in:

safety 

We know that the material system, the ternary lithium battery cathode material decomposition temperature of about 200 ℃, vacuum ball sealer lithium iron phosphate battery cathode material decomposition temperature of about 700 ℃. Laboratory test environment short-circuit lithium iron phosphate single cell, the basic fire does not exist the case, the ternary lithium battery is not the case, especially when using ternary lithium battery thermal management put forward higher requirements. For the vehicle battery pack is concerned, the safety measures more perfect and science, effective management of lithium batteries by the BMS, the battery can work in a safe state.

Temperature adaptability

With its vast territory and complicated climate, China has a very rich temperature change from the northeastern three northeastern provinces to the southernmost Hainan Island. Take Beijing as an example. As the main market for electric vehicles, the maximum summer temperature in Beijing is about 40 ℃ in summer, while the winter is basically kept at about minus 16 ℃ or even lower. This temperature range is clearly suitable for better low temperature performance ternary lithium battery. The emphasis on high temperature performance of lithium iron phosphate batteries in Beijing in the winter will seem a bit weak. What's more, ternary lithium battery high temperature compared with lithium iron phosphate, the gap is not large.

Charge and discharge efficiency

In addition to battery life, charging is also an important part of electric vehicles in practical use, and ternary lithium batteries have a very big advantage over lithium iron phosphate batteries in terms of charging efficiency. The company is located in:

It can be seen from the table that the constant current ratio has no significant difference when the ternary lithium battery and the lithium iron phosphate battery are charged under 10C. When the charge rate is over 10C, the constant current ratio of the lithium iron phosphate battery decreases rapidly, and the charging efficiency decreases rapidly. The company is located in:

Lithium iron phosphate and ternary market dispute, is still evenly divided, each director. Under the circumstance of ever-changing battery technology, it is also expected that the revolutionary changes will be expected in the near future. The technology-proven ternary lithium battery and lithium iron phosphate battery occupy a place in the market by virtue of their respective advantages.