The performance of lithium-ion battery cathode materials directly affects the performance of lithium-ion batteries, and their cost also directly determines the cost of batteries. The industrial production process of cathode material is more complicated, and the synthesis route is more complicated, and the control of temperature, environment and impurity content is also more strict. The industrial production process of cathode materials is more, the synthesis route is also relatively complex, and the control of temperature, environment and impurity content is also relatively strict.
Calcination technology, the use of new microwave drying technology to dry lithium-ion battery cathode materials, to solve the conventional lithium-ion battery cathode materials drying technology takes a long time, so that the slow turnover of funds, and uneven drying, as well as the lack of depth of drying, specific features are.
1, the use of lithium-ion battery cathode material microwave drying equipment, fast and rapid, a few minutes to complete the depth of drying, can make the final moisture content of more than one thousandth.
2, uniform drying, good quality of product drying.
3、The lithium-ion battery cathode material is energy efficient, safe and environmentally friendly.
4、It has no thermal inertia, and the immediacy of heating is easy to control. Microwave sintering of lithium-ion battery cathode materials has the characteristics of fast temperature rise, high energy utilization, high heating efficiency and safety, health and pollution-free, and can improve the uniformity and yield of the product and improve the microstructure and performance of the sintered material.
General preparation methods for lithium-ion battery cathode materials
1. Solid phase method
Lithium salts such as lithium carbonate and cobalt compounds or nickel compounds are generally ground and mixed, and then sintered. The advantage of this method is the process is simple, easy to obtain raw materials, belonging to the early development of lithium-ion battery is widely researched and developed production methods, foreign technology is more mature; disadvantage is that the cathode material made by the limited capacity, poor mixing uniformity of raw materials, the performance of the prepared material stability is not good, batch to batch quality consistency is poor.
2. Complex method
The complex method uses organic complexes to prepare a complex precursor containing lithium ions and cobalt or vanadium ions, and then sintered to prepare. The advantages of this method is the molecular scale mixing, material homogeneity and performance stability, cathode material capacity is higher than the solid-phase method, has been tested abroad as an industrial method for lithium-ion batteries, the technology is not mature, there are still few reports in China.
3. Sol-gel method
Using the method of preparing ultra-micro particles developed in the 1970s, the preparation of cathode materials, the method has the advantages of the complex method, and the prepared electrode materials have a greater increase in capacity, belongs to a method that is rapidly developing at home and abroad. The disadvantage is that the cost is high and the technology is still in the development stage.
4. Ion exchange method
LiMnO2 prepared by ion exchange method, reversible discharge capacity of 270mAh/g high value, this method has become a new hot spot for research, it has the characteristics of stable performance of the electrode made, high electric capacity. However, the process involves energy and time consuming steps such as solution recrystallization and evaporation, which is still quite far from practicalization.
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