Stable electrolyte for reducing battery expansion

Abstract

The invention relates to the field of researches of battery electrolyte, in particular to a stable electrolyte for reducing battery expansion. The stable electrolyte for reducing battery expansion comprises the following components in parts by weight: 0.5-20 parts of fipronil desulfinyl, 0.1-15 parts of electrolyte lithium salt, 60-90 parts of organic solvents and 0.1-5 parts of a functional additive, wherein the functional additive is at least one of biphenyl, vinylene carbonate, fluoro vinylene carbonate and 1,3-(1-propylene) sultone. The stable electrolyte for reducing battery expansion has the advantages and positive effects that the operation and exchange, between the anodes and cathodes of batteries, of ions in the electrolyte are too fast under high temperature or high pressure, the lithium ions collide with the carbonic ester and ether organic solvents, the fipronil desulfinyl microcosmically act with the carbonic ester and ether organic solvents under high temperature or high pressure so as to form a mini barrier film to prevent the electrolyte from further decomposition, so that further expansion of the lithium ion batteries is avoided and the service life of the batteries is prolonged.

Description

technical field [0001] The invention relates to the field of chemical industry, to the field of battery electrolyte research, in particular to a stable electrolyte that reduces battery expansion. Background technique [0002] With the development and wide application of lithium-ion batteries, the requirements for the performance of lithium-ion battery electrolytes are also increasing. High voltage, high specific energy, and long cycle life are the main goals pursued by people. As the number of battery cycles increases, especially when the battery is exposed to harsh conditions such as high temperature or high pressure, the heat of the electrolyte will cause the battery to expand, resulting in a decrease in the service life of the battery. Lithium-ion batteries are suitable for a narrow temperature range. Generally, when the temperature is higher than 60°C, the lithium hexafluorophosphate system electrolyte will decompose, causing the battery cell to expand, causing the batte...

AI Technical Summary

Problems solved by technology

As the number of battery cycles increases, especially when the battery is exposed to harsh conditions such as high temperature or high pressure, the electrolyte heat will cause the battery to expand, resulting in a decrease in battery life

The applicable temperature range of lithium-ion batteries is narrow. Generally, when the temperature is higher than 60°C, the electrolyte of the lithium hexafluorophosphate system will decompose, causing the cell to expand, causing the battery capacity to decay rapidly, and may even cause combustion or explosion, which seriously limits its wide application.

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