Lithium ion battery electrolyte additive, lithium ion battery electrolyte and lithium ion battery

Abstract

The invention relates to a lithium ion battery electrolyte additive, a lithium ion battery electrolyte and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion electrolyte additive disclosed by the invention comprises vinyl phosphate and vinyl sulfonyl fluoride. The lithium ion electrolyte comprises a non-aqueous organic solvent, a lithium salt and anadditive, wherein the additive comprises vinyl phosphate and vinyl sulfonyl fluoride. The lithium ion electrolyte disclosed by the invention has relatively good flame retardance. When the lithium ionbattery adopting the electrolyte works at a high voltage, the lithium ion battery not only has good cycling stability, but also has good safety performance at a high temperature.

Description

technical field [0001] The invention relates to a lithium-ion battery electrolyte additive, a lithium-ion battery electrolyte and a lithium-ion battery, belonging to the technical field of lithium-ion batteries. Background technique [0002] Due to the advantages of high specific energy, long cycle life, and no memory effect, lithium-ion batteries are widely used in many fields such as mobile phones, computers, cameras, and electric vehicles. However, with the continuous development of science and technology, various application fields have put forward higher requirements on the performance of lithium-ion batteries. Among them, the most urgent thing is to improve the energy density of lithium-ion batteries under the premise of ensuring safety. At present, the commonly used method to increase the energy density of lithium-ion batteries is to use high-voltage cathode materials, such as LiCoPO 4 、LiNi 0.5 mn 1.5 o 4 、 LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 and other materials. Ho...

AI Technical Summary

Problems solved by technology

However, the safety performance of the non-aqueous electrolyte is poor