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A kind of high coulombic efficiency lithium-sulfur battery electrolyte and preparation method thereof

A lithium-sulfur battery and electrolyte technology, applied in the field of lithium-sulfur battery electrolyte, high coulombic efficiency lithium-sulfur battery electrolyte and preparation thereof, can solve problems such as increasing battery cost, complicated preparation process, etc. Coulombic efficiency, the effect of suppressing the shuttle effect

Active Publication Date: 2020-05-22
苏州德加能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These solutions focus on the negative electrode material of the battery, and the improvement of the negative electrode material often brings complicated preparation processes and increases the cost of the battery

Method used

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  • A kind of high coulombic efficiency lithium-sulfur battery electrolyte and preparation method thereof
  • A kind of high coulombic efficiency lithium-sulfur battery electrolyte and preparation method thereof
  • A kind of high coulombic efficiency lithium-sulfur battery electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a high coulombic efficiency lithium-sulfur battery electrolyte, and its preparation method is as follows:

[0030] (a) Put lithium bis(trifluoromethylsulfonyl)imide into a glove box for sufficient drying; after sufficient drying, add ethylene glycol dimethyl ether and 1,3 dioxolane at a volume ratio of 1:1 In the mixed organic solvent of cyclic ethers, carry out sufficient stirring until completely dissolved;

[0031] (b) Add additive bis(4-nitrophenyl) carbonate (CAS number: 5070-13-3, the mass ratio of additive in the mixed solution that forms is 0.5wt%) in the mixture that step (a) obtains, fully Stir and let stand for 24 hours after the additives are completely dissolved.

Embodiment 2

[0033] This example provides an electrolyte solution for a lithium-sulfur battery with high Coulombic efficiency. The preparation process is basically the same as that in Example 1, except that the mass ratio of additives in the formed mixed solution is 1 wt%.

Embodiment 3

[0035] This embodiment provides an electrolyte solution for a lithium-sulfur battery with high Coulombic efficiency, the preparation process of which is basically the same as that in Embodiment 1, except that the mass ratio of additives in the formed mixed solution is 2 wt%.

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Abstract

A lithium-sulfur battery electrolyte and a preparation method therefor. The lithium-sulfur battery electrolyte comprises an ether organic solvent, a lithium salt, and an ester additive, and the ester additive is one selected from carbonic ester and sulfite ester or a mixture thereof. The specific additive is mixed with the ether organic solvent and the lithium salt so that reaction with polysulfide produced in a charging / discharging process of a lithium-sulfur battery is enabled in the charging / discharging process, so as to inhibit shuttle of the polysulfide. The shuttle effect of the lithium-sulfur battery is effectively inhibited, and the cycle life and the coulombic efficiency of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the field of lithium-sulfur batteries, and relates to a lithium-sulfur battery electrolyte, in particular to a high coulombic efficiency lithium-sulfur battery electrolyte and a preparation method thereof. Background technique [0002] With the development of modern society, fossil energy consumption accounts for an increasing proportion of energy consumption, and the development of sustainable and clean energy is imminent. How to solve the problem of environmental pollution and the continuous consumption of fossil energy, high-efficiency energy storage devices, as the most popular research and development direction at present, are the core pillars of the sustainable renewable energy industry, consumer electronics industry, and transportation industry. [0003] Among many energy storage methods, lithium-ion batteries occupy a core position in today's energy storage devices due to their advantages such as small self-discharge, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/052H01M10/42
CPCH01M10/052H01M10/0567H01M10/0568H01M10/4235Y02E60/10
Inventor 晏成林杨庭舟钱涛
Owner 苏州德加能源科技有限公司
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