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Methods to improve the performance of lithium-ion batteries

The actual capacity of graphite negative electrodes used in commercial lithium-ion batteries is relatively low under low temperature conditions. Hard carbon has good low-temperature lithium storage capacity, which can effectively improve the low-temperature performance of batteries. However, during the formation of the battery, the solid electrode/electrolyte interface facial mask formed at the hard carbon anode interface will irreversibly consume Li+, thus reducing the actual capacity and specific energy of the battery.

Introducing halogen conversion intercalation chemistry into graphite, innovating the development of composite electrodes, and combining this cathode with a passivated graphite anode to create a lithium-ion aqueous full battery capable of reaching 4V, with an energy density of 460Wh/kg and a Coulombic efficiency of approximately 100%. The battery is based on the negative ion conversion intercalation mechanism, combined with high energy density conversion reactions, which has excellent reversibility of intercalation and improves the safety of water-based batteries.

A solvent mixture in the electrolyte of lithium-ion batteries, including a dissolved lithium salt and organic additives. The surface and overall stability of silicon negative electrodes can be added to improve long-term cycling and service life. This new type of chemical substance has a simple structure, scalability, and is fully compatible with existing battery technology.

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