How important is lithium battery positive material?

At present, the performance and price of lithium-ion cathode materials are bottlenecks that restrict their further development to high energy, long life, and low cost. One of the key technologies for the development of high-energy lithium ions is the development of cathode materials. In theory, materials with layered structures and spinel structures can be used as cathode materials for lithium-ion batteries. Compared with the negative electrode batteries, the development of positive electrode materials is slightly slower. The reason is that it is not easy to prepare for practical materials. Small changes in the preparation process can lead to great differences in material structure and even performance. In general, in the composition of lithium-ion battery products, positive electrode materials occupy the most important position, and the quality of positive electrode materials directly determines the performance of the final lithium ion battery products. Positive materials account for about 40 % of battery costs. Lithium-ion battery cathode material has become a bottleneck that restricts the development of high-performance lithium-ion batteries in China. In addition, the progress made in the research of positive electrode materials also shows the broad prospects for the development of lithium ion battery positive electrode materials.

Therefore, our requirements for positive materials are as follows

1, the battery reaction should have a large Gibbs free energy to ensure that high battery voltage can be provided;

2, Gibbs free energy change during the discharge process to ensure that the output voltage is close to a constant;

3, positive and material should have a low oxidation potential, that is, a higher voltage than metal lithium;

4, as light as possible, but there is a large amount of lithium storage to ensure a large capacity;

5, has a good electron conductivity;

6, the structure is stable in all operating voltages, ensuring a long cycle life;

7, materials cheap and low poison.

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