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Lithium cobalt oxide is a material that is prone to structural collapse after more than half of the lithium is removed, The theoretical specific capacity is 2754.2V, which is generally between 140 and 145. Someone has done lithium cobalt oxide before, and the capacity is about 155-160mAh/g at 4.35V. From these values, it can be seen that although the capacity of lithium cobalt oxide increases at high voltage, it also exceeds the lithium removal amount required for its structural stability. Therefore, from the perspective of this material itself, it is not suitable for high voltage. Currently, high voltage lithium cobalt oxide is modified, and the cost is very high It is also difficult to ensure the stability of modified lithium cobalt oxide under long-term cycling at 4.4V. However, in order to address your problem, by the way, the advantages of lithium cobalt oxide at high voltage are also mentioned. Due to the longest development time of lithium cobalt oxide, its matching with the electrolyte is the most mature. High temperature gas production is also the best control

The structure of ternary materials and lithium cobalt oxide is very stable at 4.5V, and the higher the voltage, the higher the lithium ion removal efficiency, which is the first time efficiency. At 4.35V, the capacity is approximately 160-165mAh/g4.5V, which can reach or even exceed 200mAh/g and does not require modification (Of course, the premise is that high-performance ternary materials that are sold without much technical content after purchasing precursor burning in the market are not within this range)

The only drawback of ternary materials under high voltage is that they are opposite to lithium cobalt oxide. As a relatively new type of material, it is difficult to match the electrolyte, mainly manifested in the production of gas at high temperatures. However, ATL in Japan, South Korea, and China can already solve this problem well in soft pack batteries. The solution to this problem mainly lies in controlling the surface properties of ternary materials, controlling pH, and matching the electrolyte

The theoretical capacity of lithium cobalt oxide is over 270 grams, but currently it can only reach around 145 because it can only transfer 0.5mol of electrons

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