Composite non-electrolyte additive for improving high-temperature safety performance of battery

Abstract

The invention discloses a composite nonaqueous electrolyte additive for improving the high-temperature safety performance of a battery. The safety and flame retardancy of the battery in a high-temperature state can be effectively improved, and the electrolyte is prevented from combusting and exploding due to battery overheating. The non-electrolyte additive for improving the high-temperature safety performance of the battery consists of fluorinated carbonic ester and alkyl phosphate. The non-electrolyte additive is an additive capable of effectively improving the safety of the battery in the high-temperature state; and the safety of the battery in the high-temperature state is effectively guaranteed, the electrical property of the battery is not influenced, and a requirement of customers on the high safety of the battery can be well met. The non-electrolyte additive can be applied to the conventional lithium ion batteries and lithium battery systems.

Description

technical field [0001] The invention relates to a nonaqueous electrolyte composite additive, in particular to a composite nonaqueous electrolyte additive which can effectively improve the safety performance of batteries under high temperature conditions. Background technique [0002] As an important component of ion conduction in lithium batteries, non-aqueous electrolytes are basically stable in composition, mainly including EC, DMC, PC, EMC, DEC, etc. With the continuous expansion of the lithium-ion battery market, safety issues have become constraints for lithium-ion batteries. An important factor in the development of batteries, especially in the fields of electric vehicles and large-scale energy storage, puts forward higher and newer requirements for the safety of batteries. However, the electrolyte commonly used in lithium-ion batteries has a low flash point and is flammable, which has become a safety hazard during the use of lithium-ion batteries. Lithium-ion seconda...

AI Technical Summary

Problems solved by technology

However, the electrolyte commonly used in lithium-ion batteries has a low flash point and is flammable, which has become a safety hazard during the use of lithium-ion batteries.

Lithium-ion secondary batteries emit a lot of heat when they are overcharged and discharged, short-circuited, and high-current for a long time. These heats become a safety hazard for flammable electrolytes, which can cause catastrophic thermal breakdown (thermal runaway) or even battery explosion.

Images