Battery electrolyte containing amine iodide additive and preparation method of battery electrolyte

An electrolyte and additive technology, which is applied in the field of battery electrolytes containing iodide amine additives and their preparation, can solve the problems of increasing the electrolyte preparation process and cost, and achieves improved long-cycle performance, decreased Coulombic efficiency, and increased lithium deposition size. Effect

Active Publication Date: 2021-05-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many reports on electrolyte additives, and each additive has its own characteristics and mechanism of action, but the use of multiple additives will increase the preparation process and cost of the electrolyte

Method used

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  • Battery electrolyte containing amine iodide additive and preparation method of battery electrolyte
  • Battery electrolyte containing amine iodide additive and preparation method of battery electrolyte
  • Battery electrolyte containing amine iodide additive and preparation method of battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Purify the organic solvent dioxolane and 1,2-dimethoxyethane with molecular sieves to remove water;

[0051] (2) In an argon atmosphere (H 2 O2 <0.1ppm), mix the purified 5mL dioxolane and 5mL 1,2-dimethoxyethane evenly to obtain the organic solvent of the electrolyte;

[0052] (3) At room temperature, dissolve 1.435 g of lithium bis(trifluoromethylsulfonyl)imide in an organic solvent, stir well until completely dissolved, and the lithium bis(trifluoromethylsulfonyl)imide The molar concentration is 0.5mol / L;

[0053] (4) Add 0.226g lithium nitrate to the solution obtained in step (3), stir until completely dissolved, and the addition ratio of lithium nitrate is 2wt%, to obtain a blank electrolyte;

[0054] (5) Add 0.0113g of methyl ammonium iodide to the blank electrolyte, stir evenly until completely dissolved, the addition ratio of methyl ammonium iodide is 0.1wt%, and obtain a battery electrolyte containing the ammonium iodide additive.

[0055] Two sets of li...

Embodiment 2

[0059] (1) organic solvent dioxolane and triglyme are purified with molecular sieves to remove water;

[0060] (2) In an argon atmosphere (H 2 O2 <0.1ppm), the purified 5mL dioxolane and 5mL triglyme were uniformly mixed to obtain the organic solvent of the electrolyte;

[0061] (3) At room temperature, dissolve 1.435 g of lithium bis(trifluoromethylsulfonyl)imide in an organic solvent, stir well until completely dissolved, and the lithium bis(trifluoromethylsulfonyl)imide The molar concentration is 0.5mol / L;

[0062] (4) Add 0.238g lithium nitrate to the solution obtained in step (3), stir until completely dissolved, and the addition ratio of lithium nitrate is 2wt%, to obtain a blank electrolyte;

[0063] (5) Add 0.0119g of tetramethylammonium iodide to the blank electrolyte, stir until it is completely dissolved, and the addition ratio of the tetramethylammonium iodide additive is 0.1wt%, to obtain a battery electrolyte containing the ammonium iodide additive.

[0064] T...

Embodiment 3

[0068] (1) organic solvent dioxolane and triglyme are purified with molecular sieves to remove water;

[0069] (2) In an argon atmosphere (H 2 O2 <0.1ppm), the purified 5mL dioxolane and 5mL triglyme were uniformly mixed to obtain the organic solvent of the electrolyte;

[0070] (3) At room temperature, dissolve 2.87g of lithium bis(trifluoromethylsulfonyl)imide in an organic solvent, stir well until completely dissolved, the lithium bis(trifluoromethylsulfonyl)imide The molar concentration is 1mol / L;

[0071] (4) Add 0.1785g lithium nitrate to the solution obtained in step (3), stir until completely dissolved, and the addition ratio of lithium nitrate is 1.5wt%, to obtain a blank electrolyte;

[0072] (5) Add 0.0179g of tetramethylammonium iodide to the blank electrolyte, stir until completely dissolved, and the addition ratio of tetramethylammonium iodide additive is 0.15wt%, and obtain the battery electrolyte containing the ammonium iodide additive.

[0073] Two sets of li...

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Abstract

The invention discloses a battery electrolyte containing an amine iodide additive and a preparation method of the battery electrolyte, and belongs to the technical field of battery materials. The electrolyte provided by the invention comprises an organic solvent, a lithium salt and an additive, wherein the additive comprises amine iodide. The anion I<-> of the amine iodide additive can form a solid electrolyte interface film containing LiI on the surface of metal lithium, hydrogen-bond interaction exists between amido cations and Li2S, an energy barrier of Li2S conversion can be reduced, and the utilization rate of an active substance sulfur is increased. According to the additive used in the invention, both anions and cations can act, and the acting angles are different, so that the efficiency of the electrolyte can be greatly improved, and the usage amount of the electrolyte can be reduced.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a battery electrolyte containing an ammonium iodide additive and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries have become a research hotspot for high-energy-density lithium metal batteries because of their advantages such as high energy density, low price, and environmental friendliness. Sulfur has a theoretical specific capacity of up to 1675mAh / g, matching with lithium metal anodes, and the theoretical energy density of lithium-sulfur batteries can reach 2600Wh / kg, which has good application prospects. However, there are still many deficiencies in lithium-sulfur batteries, including low Coulombic efficiency, fast capacity fading, and severe self-discharge, many of which are related to the use of metallic lithium anodes. During the discharge process, the elemental sulfur is first reduced to form long-chain polysulfides, which ar...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058H01M10/052H01M10/42
CPCH01M10/0567H01M10/058H01M10/052H01M10/4235Y02P70/50Y02E60/10
Inventor 陈人杰徐赛男赵腾赵圆圆叶玉胜吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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