Application of fluorosulfonic acid ester compound in battery electrolyte

A technology of fluorosulfonate and compound, which is applied in the field of battery electrolyte, can solve the problems of battery capacity loss, increased manufacturing cost, and reduced battery performance, and achieve the effects of improving high-temperature cycle performance, increasing storage performance, and long cycle life

Active Publication Date: 2018-05-29
SHIJIAZHUANG SAN TAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 performanc...

Method used

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  • Application of fluorosulfonic acid ester compound in battery electrolyte
  • Application of fluorosulfonic acid ester compound in battery electrolyte
  • Application of fluorosulfonic acid ester compound in battery electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The battery electrolyte includes lithium salts, organic solvents and fluorosulfonate compounds at a mass ratio of 15:84.9:0.1. The organic solvent is ethylene carbonate and methyl trifluoroacetate in a volume ratio of 40:60. The lithium salt is LiPF 6 , concentration 1mol / L. The additive is fluorosulfonyloxybenzene (Formula I).

Embodiment 2

[0018] The battery electrolyte includes lithium salts, organic solvents and fluorosulfonate compounds in a mass ratio of 16:74:10. The organic solvent is propylene carbonate, methyl propionate, and butyl trifluoroacetate in a volume ratio of 30:40:30. Described lithium salt is LiBF 4 , concentration 1mol / L. The additive is fluorosulfonyloxyethane (formula II).

Embodiment 3

[0020] The battery electrolyte includes lithium salts, organic solvents and fluorosulfonate compounds in a mass ratio of 17:81:2. The organic solvent is gamma-butyrolactone and diethyl carbonate with a volume ratio of 50:50. The lithium salt is LiPF 6 , concentration 1mol / L. The additive is fluorosulfonyloxypropene (formula III).

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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...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 张民刘鹏王军
Owner SHIJIAZHUANG SAN TAI CHEM CO LTD
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