Application of siloxane-containing nitrile compounds in battery electrolyte

Abstract

The application of nitrile compound containing siloxane group in battery electrolyte belongs to the technical field of battery electrolyte. The nitrile compound containing siloxane group is added intobattery electrolyte as additive, and the addition amount is 0.1% of battery electrolyte mass. 10%, and that chemical structural formula of the siloxane group-containing nitrile compound is as described in the descriptionwherein n>=1, R is selected from methyl, vinyl or tert-butyl. By adding nitrile compounds containing siloxane groups into the electrolyte of lithium battery, the low temperature discharge characteristics and life cycle characteristics of the battery are excellent. The decomposition reaction of carbonate-based organic solvents is suppressed even if the battery is stored at a high temperature in a fully charged state or is undergoing a charge / discharge process, thereby solving the expansion problem and improving the high temperature life cycle characteristics of the battery.

Description

technical field [0001] The invention belongs to the technical field of battery electrolytes, relates to an additive for battery electrolytes, and in particular relates to applying siloxane group-containing nitrile compounds to battery electrolytes. By adding a siloxane group-containing nitrile compound to the lithium battery electrolyte, the low-temperature discharge characteristics and life cycle characteristics of the battery are excellent; The decomposition reaction of organic solvents is also suppressed, thereby solving the problem of swelling, and the high-temperature life cycle characteristics of the battery are also improved. Background technique [0002] Recently, there has been increasing interest in energy storage technologies. As energy storage technology extends to devices such as cellular phones, camcorders, notebook computers, personal computers, and electric vehicles, the demand for high energy density batteries used as energy sources for such electronic devi...

AI Technical Summary

Problems solved by technology

However, the solvent structure of these positive electrode materials changes under high voltage, and the transition metal is easy to dissolve and deposit on the negative electrode. In addition, the commonly used electrolyte usually decomposes at a voltage higher than 4V, producing gas, thereby will lead to a decrease in battery performance

In order to solve the above problems, researchers usually carry out surface protection coating or doping on the positive electrode material to improve the cycle performance under high voltage, but these methods are often accompanied by the loss of battery capacity, and the manufacturing process is cumbersome and the manufacturing cost increases.

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