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9. High voltage electrolyte

Improving battery energy density is one of the trends in lithium-ion batteries, and there are currently two important methods to improve energy density:

One way is to increase the charging cutoff voltage of traditional positive electrode materials, such as increasing the charging voltage of lithium cobalt oxide to 4.35V and 4.4V. However, the method of increasing the charging cutoff voltage is limited, and further increasing the voltage will lead to the collapse of the lithium cobalt oxide structure and unstable properties;

Another approach is to develop new cathode materials with higher charging and discharging platforms, such as lithium rich manganese based and nickel cobalt lithium.

After the voltage of the positive electrode material is increased, it needs to be matched with a high-voltage electrolyte, and additives play a crucial role in the high-voltage performance of the electrolyte, which has become a research and development focus in recent years.

10. Water-based binder

At present, PVDF is widely used as a binder for positive electrode materials, and organic solvents are used for dissolution. The adhesive system for the negative electrode includes SBR, CMC, fluoroolefin polymers, and organic solvents. During the production process of electrode plates, organic solvents need to be dried and evaporated, which not only pollutes the environment but also endangers employee health. The solvent for drying and evaporation needs to be collected and processed using special refrigeration equipment, and fluoropolymers and their solvents are expensive, which increases the production cost of lithium-ion batteries.

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