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High voltage batteries refer to batteries with a higher voltage compared to regular batteries. It can be divided into two types based on battery cells and battery packs. From the perspective of the voltage of the battery cells, high-voltage batteries are important, especially for lithium-ion batteries. Currently, there are two important types of lithium-ion battery cells: high-voltage lithium-ion battery cells and low-voltage lithium-ion battery cells.

At present, lithium cobalt oxide has been widely studied and applied as a high-voltage anode material. This structure is non nafeo2 type, which is more suitable for the insertion and ejection of lithium ions. The theoretical energy density of Lithium cobalt oxide is 274mAh/g, the production process is simple, the electrochemical performance is stable, and the market share is high. In practical applications, only a portion of lithium ions can be reversibly embedded and ejected, with an actual energy density of approximately 167mAh/g (operating voltage of 4.35v). Increasing the working voltage can significantly increase energy density. For example, increasing the working voltage from 4.2v to 4.35v can increase the energy density by about 16%.

High voltage lithium-ion battery cell has high energy density and lower safety performance than low-voltage battery, but its discharge platform is relatively high. Under the same capacity, high-voltage battery is lighter than low-voltage battery in terms of volume and weight.

With the increase of voltage, certain safety performance of high-voltage lithium-ion batteries may decrease during use, so they have not been widely used in power vehicles. At present, ternary materials and Lithium iron phosphate are the main cathode materials for batteries used in power vehicles. In order to improve energy density and meet demand, high nickel positive electrode materials such as 811NCM and NCA, high capacity silicon carbon negative electrode materials, or improving the utilization rate of battery space are generally chosen to enhance their energy density and endurance

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