Electrolyte capable of improving security property of lithium ion battery

Abstract

The invention discloses an electrolyte capable of improving the security property of a lithium ion battery. The electrolyte is prepared by mixing of electrolyte salt, organic solvents and additives, wherein the electrolyte salt is solid solvent LiBOB; the organic solvents are ethylene carbonate EC, propylene carbonate PC and ethyl methyl carbonate EMC; the additives are vinylene carbonate VC, vinyl ethylene carbonate VEC, trimethylene sulfite PS and tributyl phosphate TBP. By using the novel electrolyte salt and the functional additives, the thermal stability of the lithium ion battery is improved, on premise of ensuring the battery circulation property, the security property of the battery is effectively improved, and the problems that the battery is combusted and exploded under an overheating condition are avoided. By applying the electrolyte, the reliability and the security of the lithium ion battery are improved, the quality of the lithium ion battery is greatly improved, and the market application prospect of products of battery production factories is improved, so that the successful development of the novel electrolyte has great production practice significance.

Description

technical field [0001] The invention relates to lithium-ion battery technology, in particular to an electrolyte capable of improving the safety performance of the lithium-ion battery. Background technique [0002] At present, lithium-ion batteries have the advantages of high specific energy, high voltage, many cycle times, and long storage time. They are not only widely used in portable electronic devices, such as mobile phones, digital cameras and laptop computers, but also widely used in electric Large and medium-sized electric equipment such as automobiles, energy storage, electric bicycles, and electric tools. [0003] With the continuous expansion of the lithium-ion battery market, safety issues are an important prerequisite for innovation in the lithium-ion battery market. Organic electrolyte is the carrier of ion movement in lithium-ion batteries, mainly for lithium-ion secondary batteries, which release a lot of heat under the conditions of high-temperature heat...

AI Technical Summary

Problems solved by technology

Organic electrolyte is the carrier of ion movement in lithium-ion batteries, mainly for lithium-ion secondary batteries, which release a lot of heat under the conditions of high-temperature heating, over-charging and discharging, short-circuit and high-current working for a long time, and these heat become flammable The safety hazard of the electrolyte may cause catastrophic thermal breakdown (thermal collapse) and combustion of the battery, and even cause the battery to explode

At present, lithium-ion batteries usually use an electrolyte mixed with an electrolyte lithium salt LiPF6 (lithium hexafluorophosphate) and an organic solvent. The application of this electrolyte may cause the above-mentioned potential safety hazards. Thermal stability, to avoid the burning and explosion of batteries under overheating conditions, effectively improve the safety performance of batteries, and improve the use of safe electrolytes for batteries

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