SHINHOP Laser: What categories of lithium-ion battery cathode materials are there?
2021-05-21
Power batteries (lithium-ion batteries) are the heart of new energy vehicles. Generally speaking, the cost of power batteries accounts for about 40% of new energy vehicles. The cathode material is the core of the power battery, and its cost in the power battery can also reach about 40%.
The choice of cathode material directly determines the performance of the battery. Since the cathode material has a significant impact on battery performance, many researchers are committed to developing higher-performance cathode materials, such as lithium nickel oxide, lithium cobalt oxide, lithium titanate, etc.
1. Lithium cobalt oxide. The main representative of lithium cobalt oxide is lithium cobalt oxide, which has the characteristics of five highs: high energy density, high price, high power, high degree of commercialization, and high cycle life. However, the shortcomings are also very obvious; there is a serious shortage of cobalt salts in our country, and cobalt salts need to be imported.
2. Lithium nickel oxide. The main representative of lithium nickel oxide is lithium nickel oxide, which has product characteristics similar to nickel cobalt oxide but is priced lower than nickel cobalt oxide. Due to its large energy density, it can reach 274mAh/g, making it a relatively ideal high energy density lithium-ion battery cathode material. However, its safety performance is too poor, and the number of cycles is relatively low, so currently, there are not many manufacturers using lithium nickel oxide as the cathode material for lithium-ion batteries.
3. Nickel cobalt multi-oxide. This is what we commonly refer to as multi-oxide. The most common ones currently are lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide. Among them, lithium nickel cobalt manganese oxide is further divided into lithium nickel cobalt manganese oxide 111, lithium nickel cobalt manganese oxide 523, lithium nickel cobalt manganese oxide 622, and lithium nickel cobalt manganese oxide 811. However, lithium nickel cobalt aluminum oxide is not as widely used. This technical route is mostly provided by Panasonic for Tesla, with a ratio of 0.8 to 0.15 to 0.05.
4. Lithium titanate. The typical representative of lithium titanate is lithium titanate, in which Zhuhai Yinlong occupies a dominant position. The advantages of lithium titanate are fast charging, while the disadvantages are low energy density, requiring charging after a period of use. Another advantage is safety, and the third advantage is that the number of cycles can reach 20,000.
5. Lithium iron phosphate. The main representative of lithium iron phosphate is lithium iron phosphate, which has balanced performance in all aspects, is non-toxic and pollution-free, and has a cycle life of no less than 2000 times. When used as a power source for passenger vehicles, its safety performance is at a high level.
6. Lithium manganese oxide. The main representative of lithium manganese oxide is lithium manganese oxide, with resources being relatively abundant in our country, and the product is currently a research hotspot. Among them, LiMn2O4 has a high energy density, but its stability is greatly reduced, especially under high-temperature conditions, where LiMn2O4 is unstable. However, its main advantages are quite obvious: the product is pollution-free and has good safety performance.
Since power batteries generally adopt cell structures with tabs, the welding quality of the cell electrode tabs for power battery PACK is also very high. Currently, feedback from various channels in the market welding industry indicates that due to the small weld spots, graphical welding trajectories, high power, and energy density of lasers, they can weld dissimilar metal materials, making their welding process more capable of meeting the needs of power battery PACK tab welding. Of course, professional welding requires more specialized welding equipment and manufacturing processes. If you have some difficulties regarding power batteries and cell welding, you can consult SHINHOP, a manufacturer of laser welding equipment for power batteries, which may help solve the welding problems that have troubled you for many years.
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Shenzhen SHINHOP Laser Equipment Co., Ltd. It is a scientific and technological enterprise specializing in the research and development, production and sales of industrial laser processing equipment. It has been deeply engaged in the new energy industry for 20 years, focusing on the non-standard customization of automatic lithium battery cell assembly line and module PACK production line. It has successively obtained the national high-tech and specialized new enterprise certification.
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