Electrolyte and secondary battery

Abstract

The invention provides an electrolytic solution and a secondary battery. The electrolytic solution includes an electrolyte salt, an organic solvent and additives, and the additives include a first additive and a second additive. The combined use of the first additive and the second additive can significantly suppress the high-temperature storage gas production of the secondary battery, and significantly improve the high-temperature storage residual capacity retention rate of the secondary battery.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to an electrolyte and a secondary battery. Background technique [0002] As the most commonly used secondary battery, lithium-ion batteries are widely used in consumer electronics products, energy storage and power batteries due to their advantages such as high specific energy, long cycle life, and small self-discharge. With the widespread application of lithium-ion batteries, their use environments have long tended to be diverse, and the performance requirements for lithium-ion batteries are getting higher and higher. At present, the charging window of lithium-ion batteries is narrow, the life is short, and lithium is easy to decompose under the condition of high-current charging. When lithium decomposition is serious, lithium dendrites are easy to form and puncture the isolation film, resulting in a high safety risk of lithium-ion batteries. At the same time, due to th...

AI Technical Summary

Problems solved by technology

At present, the charging window of lithium-ion batteries is narrow, the service life is short, and it is easy to decompose lithium under the condition of high-current charging. When lithium decomposition is serious, lithium dendrites are easy to form and puncture the isolation film, resulting in a high safety risk of lithium-ion batteries.

At the same time, due to the large polarization, the electrolyte consumption of lithium-ion batteries increases when they work at high voltage for a long time, which seriously shortens the life of lithium-ion batteries.

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