Application of fluorosulfonic acid ester compound in battery electrolyte

Abstract

The invention discloses application of a fluorosulfonic acid ester compound in a battery electrolyte and belongs to the technical field of battery electrolytes. The fluorosulfonic acid ester compoundis added in the battery electrolyte as an additive with the addition quantity being 0.1-10 percent of the mass of the battery electrolyte and is one or combination of more of a formula I, a formula II, a formula III and a formula IV, and the formulas are described in the description. According to the application, by adding the fluorosulfonic acid ester compound in a lithium battery electrolyte, sothat the low temperature discharge characteristic and the life cycle characteristic of a battery are outstanding.

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 fluorosulfonate compounds to battery electrolytes. By adding fluorosulfonate-based compounds to the lithium battery electrolyte, the battery has excellent low-temperature discharge characteristics and life cycle characteristics; even when the battery is stored at high temperature in a fully charged state or is undergoing charge / discharge, organic solvent based on carbonate The decomposition reaction of the battery is also suppressed, thereby solving the swelling problem, 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 v...

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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