How to improve the specific energy of lithium iron phosphate

The focus of research and development of lithium iron phosphate is not the improvement of the material itself, but the design of the battery and the supporting anode material. After years of development, lithium iron phosphate has formed an annual production capacity of more than 100,000 tons, and the technology of materials has been very mature. Then the next important thing to study is what kind of anode material is required for lithium iron phosphate to better exert its excellent performance.

Take two materials as an example, one can be quickly charged at low temperatures, and the other can have a higher specific energy. Graphene materials can be quickly charged at low temperatures, silicon-carbon materials with higher specific energy, and must be nano-scale silicon.

In this regard, in order to increase the specific energy of lithium iron phosphate, it is necessary to solve the problem of low cycle coulombic efficiency of silicon negative electrode and voltage decay of lithium-rich manganese group, and it is expected to develop an advanced lithium ion power battery with a specific energy exceeding 400Wh/kg; In the long run, innovative lithium-ion batteries are more realistic than lithium sulphur and lithium. He proposed to develop a high-capacity lithium-rich oxide anode (≥350mAh/g) based on an anion charge compensation mechanism to develop a power battery with a specific energy greater than 500Wh/kg.

Safety determines the prospects for high-energy battery-loading applications. The development of self-heating control technology and all-solid-state batteries is a viable solution, so it is necessary to step up the research. The high-capacity electrode is the basis for realizing the high specific energy of the battery. According to the polarization model, the development of the gradient porosity electrode has an important role and significance for the development of high-energy batteries.

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