Positive electrode materials for lithium-ion batteries.lithium deep cycle marine battery

　　At present, LiCoO2 is mainly used as the positive electrode material for lithium battery products in the market. Due to its simple manufacturing process, good material stability, and over a thousand cycles. However, LiCoO2 has many drawbacks: high price, environmental pollution, poor safety performance, low specific energy, about 140mAh • g-1. Replacing Co with Ni or Mn can not only reduce costs and reduce pollution, but also improve the reversible capacity and cycling stability of the material.

　　1 LiNiO2LiNiO2 also has a layered structure, with a reversible capacity of up to 200mAh • g-1. However, during the preparation process, it is easy to produce nickel rich and non stoichiometric materials. Lithium nickel is prone to dislocations, which affect the capacity and cycle stability of the material, especially its high Oxidation state and thermal stability.

　　The resources of manganese containing compounds are very abundant, and manganese containing materials have low prices and no environmental pollution, making them ideal as positive electrode materials.

　　3 Iron compounds are rich in iron resources without pollution, so Iron compounds as cathode materials have also attracted people's attention. The actual capacity of LiFePO4 can reach 90% of the theoretical capacity of 170mAh · g-1, but its conductivity is poor, the preparation process is complex, and the iron valence state is difficult to control, often requiring synthesis in an argon atmosphere.

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