General preparation method of lithium ion battery cathode material

1. Solid phase method

Generally, a lithium salt such as lithium carbonate is mixed with a cobalt compound or a nickel compound, and then subjected to a sintering reaction. The advantage of this method is that the process flow is simple and the raw materials are easy to obtain. It belongs to the method of extensive research and development in the early stage of lithium battery development, and the foreign technology is relatively mature; the disadvantage is that the prepared positive electrode material has limited capacitance, poor uniformity of raw material mixing, and performance of prepared materials. Poor stability and poor quality consistency between batch and batch.

2. Complex method

The complex method first prepares a complex precursor containing a lithium ion and a cobalt or vanadium ion with an organic complex, followed by sintering. The method has the advantages of molecular scale mixing, good material uniformity and performance stability, and the positive electrode material has higher capacitance than the solid phase method. It has been experimentally used as an industrial method for lithium batteries in foreign countries, and the technology is not mature. .

3. Sol-gel method

The positive electrode material was prepared by the method for preparing ultrafine particles developed in the 1970s. The method has the advantages of the complex method, and the prepared electrode material has a large capacitance, which is rapidly developing at home and abroad. a way. The disadvantage is that the cost is higher and the technology is still in the development stage.