(1) The positive material should have a high oxidation and restore potential, so that the battery has a high output voltage

　　(2) Lithium ions can be embedded and detached in a large amount of positive electrode materials, which makes the battery have a high capacity

　　(3) In the process of lithium ion insertion, the structure of the cathode material should not be changed or changed as little as possible to ensure the good circulation performance of the battery

　　(4) During the insertion of the lithium ion, the oxidation and reduction potential of the positive electrode should be changed as little as possible so that the voltage of the battery will not change significantly.

　　(5) The positive material should be high -conductive, so that the battery can be charged at large currents

　　(6) The positive electrode does not react with the electrolyte

　　(7) Lithium ions should have a large diffusion coefficient in the electrode material.

　　(8) The price is cheap and there is no pollution to the environment.

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