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Comparison of other materials
At present, the most promising cathode materials for power lithium-ion batteries are modified lithium manganese oxide (LiMn2O4), lithium iron phosphate (LiFePO4), and nickel cobalt manganese oxide (Li (Ni, Co, Mn) O2) ternary materials. Due to the lack of cobalt resources and high price fluctuations with nickel and cobalt, the nickel cobalt manganese oxide ternary material is generally believed to be difficult to become the mainstream of lithium-ion batteries for electric vehicles. However, it can be mixed with spinel lithium manganese oxide within a certain range.
2、 Disadvantages of lithium iron phosphate batteries
Lithium iron phosphate batteries also have their drawbacks, such as poor low-temperature performance, low solid density of positive electrode materials, and larger volume of lithium iron phosphate batteries with equal capacity compared to lithium cobalt oxide batteries. Therefore, they do not have advantages in micro batteries. When used for power lithium-ion batteries, iron phosphate lithium-ion batteries, like other batteries, face battery consistency issues.
The threat of elemental iron
During the sintering process of preparing lithium iron phosphate, there is a possibility of iron oxide being reduced to elemental iron in a high-temperature reducing atmosphere. Single element iron can cause micro short circuits in batteries and is the most taboo substance in batteries. This is also an important reason why Japan has not used this material as the positive electrode material for power lithium-ion batteries.
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