Pure electric vehicle power LiFePO4 lithium-ion battery

2017/3/6 12:46:36

Since the advent of lithium batteries, around its research, development work has been continuously carried out. Lithium-ion battery cathode material has always been a topic of debate, and today we come to chat with lithium iron phosphate (LiFePO4) as the cathode material of lithium iron phosphate battery.

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LiFePO4 battery full name should be lithium iron phosphate lithium-ion battery, this name is too long, referred to as LiFePO4 battery. Because its performance is particularly suitable for power applications, in the name by adding "power" word, that is, lithium iron phosphate battery. It was also called "lithium iron (LiFe) power battery."

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LiFePO4 battery internal structure


Using LiFePO4 material for the positive cost


Currently used as lithium-ion battery cathode materials are: LiCoO2, LiMn2O4, LiNiO2 and LiFePO4. Among the metal elements that make up the cathode material of the battery, cobalt (Co) is the most expensive, and the storage capacity is small, nickel (Ni) and manganese (Mn) are cheaper, and iron (Fe) is the cheapest. The price of the cathode material is also consistent with the price of these metals. Therefore, the use of LiFePO4 cathode material made of lithium-ion battery should be the cheapest.


Lithium iron phosphate battery as a new energy vehicle power advantage and slightly potential


Advantages are better safety; longer service life; does not contain any heavy metals and rare metals (low cost of raw materials); no memory effect; high temperature; can easily pass acupuncture experiments.


There is a number of performance defects such as tap density and compaction density; low temperature performance is poor; battery capacity is small; the same battery capacity, lithium iron phosphate battery heavier weight larger; Seriously affected the life of electric vehicles. In addition, lithium iron phosphate battery scrapped after basically can not be recycled, there is no recyclable value.


Why Chinese car prices favor lithium iron phosphate battery


China's new energy vehicles power lithium battery development has been the direction of controversy --- lithium manganese oxide, ternary lithium, lithium iron phosphate dispute has not subsided. But why the current domestic mainstream new energy car prices are used in the basic lithium iron phosphate battery, careful analysis of the reasons there are three.


First, the development of new energy vehicles in China, must ensure the use of safe, reliable, stable performance and low cost of power batteries. Among them, safe and reliable is the first, there is no safety will not have the future of new energy automotive industry; and lithium iron phosphate in the safety of the inherent advantages.


Second, at present, lithium manganate and three yuan lithium core technology, are in the hands of Japanese and Korean enterprises. Especially the three yuan lithium, whether it is technology, technology or equipment, Japan and South Korea industry leaders have reached a very mature and stable stage. In fact, Chinese enterprises have mastered the most high-end lithium iron phosphate technology and technology. As long as the increase in investment curing this advantage, China's new energy vehicles are completely overturned possible.


Third, at present, the global nickel, cobalt resource tension, ternary lithium material formula, whether it is nickel cobalt cobalt oxide, or nickel cobalt cobalt oxide, are inseparable from the two precious metals. Its large number of applications will lead to the surge in market prices, the two metals are scarce in China, the use of Chinese cobalt more than 90% of the need to import, these two precious metals have international futures trading, the price is not only high and volatile. China's new energy vehicle promotion did not meet the policy expectations of a big reason is that the price is high. Among them, the most important reason is to occupy the cost of new energy vehicles nearly 50% of the power lithium battery prices remain high. The result of the ternary route is that the price of new energy vehicles is higher, and the government subsidy is required to be more and can not realize the market promotion.