Lithium-sulfur battery electrolyte capable of improving battery capacity and preparation method thereof

A lithium-sulfur battery and battery capacity technology, which is applied to secondary batteries, circuits, electrical components, etc., can solve the problems that the capacity of lithium-sulfur batteries does not play a substantial role, and the long-term cycle of lithium-sulfur batteries is poor, so as to improve the long-term cycle Performance, good commercialization prospects, simple preparation effect

Active Publication Date: 2017-06-23
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

However, despite accounting for 90% of the total electrolyte mass, the organic solvent of the traditional lithium-sulfur electrolyte only maintains lithium ion transport, and does not play a substantial role in further improving the capacity of lithium-sulfur batteries.
At the same time, in the cycle process of lithium-sulfur batteries with traditional electrolytes, soluble polysulfides "shuttle" between the positive and negative electrodes, so the basic problem of poor long-term cycle of lithium-sulfur batteries cannot be well solved.

Method used

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  • Lithium-sulfur battery electrolyte capable of improving battery capacity and preparation method thereof
  • Lithium-sulfur battery electrolyte capable of improving battery capacity and preparation method thereof
  • Lithium-sulfur battery electrolyte capable of improving battery capacity and preparation method thereof

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Embodiment 1

[0027] This embodiment provides a lithium-sulfur battery electrolyte and its configuration method for improving battery capacity, specifically:

[0028] (a) Under argon protection, measure 0.9 mL of 1,3-dioxolane (DOL, the first solvent) and 0.9 mL of ethylene glycol dimethyl ether (DME, the second solvent) in the glove box ) and mix, then add 0.2 mL of dimethyl trisulfide (DMTS, the third solvent), and mix well;

[0029] (b) Add 22.3 mg of anhydrous lithium nitrate additive (LiNO 3 ) and 558mg of lithium bistrifluoromethanesulfonylimide (LiTFSI); after fully mixing uniformly, the lithium-sulfur electrolyte is obtained; in the electrolyte, the concentration of LiTFSI is 1.0M, and LiNO 3 The mass percentage of DMTS is 1wt%, and the volume ratio of DMTS in the mixed solvent (also about the volume ratio of the total electrolyte) is 10vol%.

Embodiment 2

[0031] This embodiment provides a lithium-sulfur battery electrolyte and its configuration method for improving battery capacity, specifically:

[0032] (a) Under argon protection, measure and mix 0.8 mL of 1,3-dioxolane (DOL) and 0.8 mL of ethylene glycol dimethyl ether (DME) in a glove box, and then add 0.4 mL dimethyl trisulfide (DMTS), mix well;

[0033] (b) Add 22.3 mg of anhydrous lithium nitrate additive (LiNO 3 ) and 558 mg of lithium bistrifluoromethanesulfonylimide (LiTFSI); after mixing well, the lithium-sulfur electrolyte is obtained; in the electrolyte, the concentration of LiTFSI is 1.0 M, LiNO 3 The mass percentage of DMTS is 1 wt%, and the volume ratio of DMTS in the mixed solvent (also about the volume ratio of the total electrolyte) is 20 vol%.

Embodiment 3

[0035] This embodiment provides a lithium-sulfur battery electrolyte and its configuration method for improving battery capacity, specifically:

[0036] (a) Under argon protection, measure and mix 0.7 mL of 1,3-dioxolane (DOL) and 0.7 mL of ethylene glycol dimethyl ether (DME) in a glove box, and then add 0.6 mL dimethyl trisulfide (DMTS), mix well;

[0037] (b) After mixing well, add 22.3 mg of anhydrous lithium nitrate additive (LiNO 3) and 558 mg of lithium bistrifluoromethanesulfonylimide (LiTFSI); after mixing well, the lithium-sulfur electrolyte was obtained. In the electrolyte, the concentration of LiTFSI is 1.0 M, LiNO 3 The mass percentage of DMTS is 1 wt%, and the volume ratio of DMTS in the total electrolyte (also about the volume ratio in the total electrolyte) is 30 vol%.

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Abstract

The invention relates to lithium-sulfur battery electrolyte capable of improving battery capacity and a preparation method thereof. The electrolyte is prepared from organic solvents, a lithium salt and an additive and is characterized in that the organic solvents include a first solvent, a second solvent and a third solvent; the first solvent is one or more of 1,3-dioxolane, 1,4-dioxane and 1,1-dimethoxyethane; the second solvent is one or more of glycol dimethyl ether and diglyme; the third solvent is one or more of dimethyl sulfide organics; the volume ratio of the first solvent to the second solvent is (0.5 to 2) : 1, and the volume fraction of the third solvent in the organic solvents is 10 to 40%. Dimethyl ether organics are reduced into methyl lithium sulfur and can contribute capacity except positive active materials. By means of the unique work principle, lithium sulfur batteries prepared from the electrolyte have the characteristics of achieving and even exceeding the theoretical capacity of the lithium sulfur batteries.

Description

technical field [0001] The invention belongs to the field of battery electrolyte materials, and relates to a lithium-sulfur battery electrolyte, in particular to a lithium-sulfur battery electrolyte with improved battery capacity and a preparation method thereof. Background technique [0002] Since the third industrial revolution in the 1940s, the scientific and technological civilization of human society has made rapid progress. Especially since the rapid development of pure electric and hybrid vehicles in the 1990s, the demand for energy has continued to increase, followed by energy and environmental problems caused by excessive dependence on natural resources. Therefore, it is imminent to continuously improve lithium-sulfur battery technology, which has important practical significance for alleviating and even solving energy and environmental problems that endanger the world. [0003] A lithium-sulfur battery is a type of lithium battery in which elemental sulfur or sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0569H01M10/36H01M10/38
CPCH01M10/0567H01M10/0569H01M10/36H01M10/38Y02E60/10Y02P70/50
Inventor 晏成林刘杰钱涛
Owner 苏州德加能源科技有限公司
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