Lithium-sulfur battery electrolyte additive, electrolyte and lithium-sulfur battery

An electrolyte additive and lithium-sulfur battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems affecting battery cycle performance, cycle stability decline, active material extraction, etc. Discharge phenomenon, polysulfide ion elution reduction, effect of promoting conversion

Inactive Publication Date: 2021-06-22
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, polysulfide ions shuttle to the negative electrode through the electrolyte, causing rapid capacity fading and decreased cycle stability.
Especially in the static procedure of the formation process of the soft pack full battery, a large amount of polysulfide ion dissolution will cause the active material to be extracted during the pumping and sealing process, resulting in a decrease in capacity; and the corrosion of the lithium negative electrode by the polysulfide ion dissolution during this process affects the battery Subsequent cycle performance

Method used

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  • Lithium-sulfur battery electrolyte additive, electrolyte and lithium-sulfur battery
  • Lithium-sulfur battery electrolyte additive, electrolyte and lithium-sulfur battery
  • Lithium-sulfur battery electrolyte additive, electrolyte and lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of lithium-sulfur battery:

[0023] Use elemental sulfur as the positive electrode active material, add conductive agent, binder and solvent, stir and mix evenly, coat on aluminum foil, dry, roll, and cut to make the positive electrode sheet respectively; use metal lithium as the negative electrode active material The materials are cut by lithium strips and copper foils and then rolled to obtain negative electrode sheets. The positive and negative pole pieces and the polypropylene separator are assembled into a square lithium-sulfur battery by lamination. The battery is injected with liquid, and after being sealed, the lithium-sulfur battery is obtained by chemical formation, air extraction and sealing.

[0024] (2) Preparation of electrolyte

[0025] In a glove box filled with argon (moisture content <0.1ppm, oxygen content <0.1ppm), mix ethylene glycol dimethyl ether and 1,3-dioxolane at a volume ratio of 1:1 and keep Stir, slowly add 1.0mol / L lithi...

Embodiment 2

[0027] (1) Preparation of lithium-sulfur battery according to the method described in Example 1

[0028] (2) Preparation of electrolyte

[0029] In a glove box filled with argon (moisture content <0.1ppm, oxygen content <0.1ppm), mix ethylene glycol dimethyl ether and 1,3-dioxolane at a volume ratio of 1:1 and keep Stir, slowly add 1.0mol / L lithium bistrifluoromethanesulfonimide to the mixed solvent, then add lithium nitrate and 0.5% lithium difluorophosphate with a mass fraction of 2.0%, stir until completely dissolved, and obtain the present Example electrolyte.

Embodiment 3

[0031] (1) Preparation of lithium-sulfur battery according to the method described in Example 1

[0032] (2) Preparation of electrolyte

[0033] In a glove box filled with argon (moisture content <0.1ppm, oxygen content <0.1ppm), mix ethylene glycol dimethyl ether and 1,3-dioxolane at a volume ratio of 1:1 and keep Stir, slowly add 1.0mol / L lithium bistrifluoromethanesulfonimide to the mixed solvent, then add lithium nitrate and 1.0% lithium difluorophosphate with a mass fraction of 2.0%, stir until completely dissolved, and obtain the present Example electrolyte.

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Abstract

The invention discloses a lithium-sulfur battery electrolyte additive, an electrolyte and a lithium-sulfur battery. The lithium-sulfur battery electrolyte additive consists of an additive a and an additive b, wherein the additive a is one or more of LiPO2F2, LiBOB and LiPF6; the additive b is one or more of lithium nitrate, potassium nitrate and cesium nitrate. According to the invention, the electrolyte additive is added into the electrolyte, so that the lithium-sulfur battery can effectively inhibit dissolution of polysulfide ions in the formation and circulation processes, and the self-discharge phenomenon is weakened. Therefore, the performance of the lithium-sulfur battery is improved in a high-efficiency, low-cost and convenient-to-operate manner.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to an electrolyte additive for a lithium-sulfur battery, an electrolyte and a lithium-sulfur battery. Background technique [0002] The currently dominant lithium-ion battery has disadvantages such as low energy density and high production cost. To cope with the increasing demands of electric vehicles and energy storage systems, it is imperative to develop batteries with high energy density and low production cost. Among them, lithium-sulfur battery is one of the most promising alternatives, with ultra-high theoretical specific capacity and specific energy density. [0003] However, the actual lithium-sulfur full battery still has a large technical barrier hindering its commercialization process, and the energy density is far from the cycle stability and theoretical value. Among them, the dissolution of polysulfide ions in liquid electrolyte has a pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 孟跃中林乙龙王拴紧肖敏韩东梅
Owner SUN YAT SEN UNIV
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