Because of its many advantages, lithium iron phosphate batteries have gradually entered a period of rapid development.

　　Whether a material has application development potential, in addition to paying attention to its advantages, the more important thing is whether the material has fundamental shortcomings.

　　The shortcomings of lithium iron phosphate that need to be improved are summarized as follows:

　　1. In the sintering process of lithium iron phosphate materials, iron oxide may be reduced to elemental iron in a high-temperature reducing atmosphere. Elemental iron can cause micro-short circuit of the battery, which is the most taboo substance in the battery.

　　2. Lithium iron phosphate has the defects of low tap density and low compaction density, resulting in low energy density and poor low-temperature performance. When Dr. Don Hillebrand, director of the Energy Storage System Center at Argonne National Laboratory, talked about the low-temperature performance of lithium iron phosphate batteries, he used “terrible” to describe it.

　　3. Although the chemical elements Li, Fe and P in lithium iron phosphate are abundant and the cost is low, the manufacturing cost of the material and the manufacturing cost of the battery core are relatively high, and the yield rate is low.

　　4. Poor product consistency. The synthesis reaction of lithium iron phosphate is a complex multiphase reaction, and it is difficult to ensure the consistency of the reaction.

　　5. Intellectual property issues. The basic patent for lithium iron phosphate is owned by the University of Texas, while the carbon coating patent is applied by Canadians. These two basic patents cannot be bypassed. If royalties are included in the cost, the cost of the product will be further increased.

　　Japan chose lithium manganate as the positive electrode material for power-type lithium-ion batteries, hoping to solve the problems of lithium manganate in high temperature cycling and poor storage performance. In the United States, the federal government also supports the research and development of lithium iron phosphate and lithium manganate.