The advantages and disadvantages of LiCoO2 cobalt cathode material and its improvement methods

The advantages, disadvantages and improvement methods of the cobalt cathode material LiCoO2 are mainly composed of LiCoO2 cobalt anode material.In 1980, scientists proposed LiCoO2 as a cathode material. It belongs to the type of αNaFeO2 layered structure, which is suitable for Li⁺ mobile and embedded. The layer structure is relatively stable and shows good electrochemical performance. Due to its simple preparation process, it is applied in advance. When combined with LiCoO2 lithium ion battery cathode, the battery's working voltage generally exceeds 3.6V. The theoretical capacity of LiCoO2 can reach 273mAh/g. LiCoO2 as a cathode, of course, also has some defects, such as being affected by its own structure, it does not guarantee that all Li⁺ can reversibly undergo/intercalation reaction, especially in repeated charging and discharging, certain changes in the crystal structure and its capacity will be reduced , Resulting in a decrease in cycle performance and cobalt reserves, because the earth is small, and the thermal stability is not very good. In the case of unstable charging and polluting the environment, the production cost is high and the price is expensive. People are constantly looking for alternatives to it, and at the same time constantly improving its performance. At present, the performance improvement method of LiCoO2 is mainly doped with some metal elements. For example, people will choose some transition metals, such as zinc, iron, chromium, nickel, manganese, titanium, etc., and some transition metals magnesium, aluminum, calcium, strontium, etc., in a specific way is LiCoO2 These are based on the appropriate metal ion The doping ratio occupies a part of the cobalt ion lattice position. After that, some metal ions can rise to the original structure, which is more stable under the influence of lithium cobalt oxide. The cell reaction process of Li can not be completely reversible. The intercalation phenomenon can not be improved. , Improve the cycle performance of lithium-ion batteries; In addition, there are some metal ions that can be more efficient, use the activity of the battery's positive electrode as much as possible, so that the capacity of the battery can be improved to a certain extent; In addition, some metal ions can improve the material's Conductivity. Of course, although these metal element doping can improve the performance of some aspects of the material, it may also reduce some other aspects of the performance. Fish and bear's paws do not have it. In addition, at present, this type of technology may have some difficulties, so it is important Or the LiCoO2 material itself and the production process work harder to make it function better and further reduce production costs. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the precautions for daily use of ternary lithium-ion batteries?