Analysis of processing technology and preparation methods of lithium battery cathode materials

Lithium battery cathode material processing technology Lithium battery cathode material.jpg The performance of lithium battery cathode material directly affects the performance of lithium battery, and its cost directly determines the cost of the battery. There are many industrialized processing procedures for cathode materials, the synthesis route is relatively complicated, and the control of temperature, environment, and impurity content is relatively strict. There are many industrial processing procedures for cathode materials, and the synthesis route is relatively complicated. The control of temperature, environment and impurity content is also strict. The cathode materials mainly include lithium cobalt oxide, lithium manganate, lithium iron phosphate, ternary materials, etc. . The calcination technology adopts microwave drying technology to dry the cathode material of lithium battery, which has dealt with the long time of conventional lithium battery cathode material drying technology, which makes the capital turnover slower, and the drying is uneven, and the drying depth is not enough. The detailed features are: 1. The use of microwave drying equipment for lithium battery cathode materials is fast and rapid, and deep drying can be completed in a few minutes, which can make the final moisture content reach more than one thousandth; 2. The drying is average, and the product drying quality is good; 3. The lithium battery cathode material is highly efficient and energy-saving , Safety and environmental protection; 4. It has no thermal inertia, and the immediate heating is easy to control. Microwave sintered lithium battery cathode materials have the characteristics of fast heating speed, high energy utilization, high heating efficiency, safety and health and no pollution, and can improve the average and yield of products, and improve the microstructure and performance of the sintered material. General preparation methods of lithium battery cathode materials 1. The solid-phase method generally selects lithium salt such as lithium carbonate and cobalt compound or nickel compound to grind and mix, and then carry out sintering reaction. The advantage of this method is that the process flow is simple and the raw materials are easily available. It belongs to the method that has been extensively researched, developed and processed in the early stage of lithium battery development. Foreign technology is relatively mature; the disadvantage is that the prepared cathode material has limited capacitance, poor mixing of raw materials, and performance of the prepared material. The stability is not good, and the quality consistency between batches is poor. 2. Complex method The complex method uses organic complexes to first prepare complex precursors containing lithium ions and cobalt or vanadium ions, and then sinter to prepare them. The advantages of this method are molecular-scale mixing, material averageness and performance stability, and the positive electrode material has a higher capacitance than the solid phase method. It has been experimentally used as an industrial method for lithium batteries in foreign countries. The technology is not mature, and there are few reports in China. . 3. The sol-gel method uses the method of preparing ultrafine particles developed in the 1970s to prepare cathode materials. This method has the advantages of the complex method, and the capacitance of the prepared electrode materials is greatly improved. 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. The LiMnO2 prepared by the ion exchange method has a reversible discharge capacity of 270mAh/g. This method has become a new hot spot for research. It has the characteristics of stable electrode performance and high capacitance. However, the process involves energy-consuming and time-consuming steps such as solution recrystallization and evaporation, which is far from practical. In the field of lithium battery cathode materials, any small technological innovation may set off a new round of market expansion. Chinese companies should strengthen the research and development of key technologies of cathode materials, gain an international leading position, strengthen core competitiveness, and compete in international competition. Gain advantages. The structure of the lithium battery, the structure of the lithium battery is divided into five parts, namely, the positive electrode, the negative electrode, the separator, the electrolyte and the shell. (1) Lithium battery positive electrode contains active material, conductive agent, solvent, binder, matrix and other materials. (2) The negative electrode of lithium battery contains active material, binder, solvent, matrix and other materials. (3) Lithium battery diaphragm (4) Lithium battery electrolyte (5) Lithium battery shell contains steel shell, aluminum shell, cover plate, tabs, insulating tape and other hardware. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How does the charger judge that the lithium battery is overflowing?