Lithium squarate and preparation method and application thereof

A technology of lithium squaraine and squaraine, applied in the field of energy storage, can solve the problems of low electrochemical performance, prone to agglomeration, cumbersome preparation process of lithium squaraine, etc., and achieves a simple preparation process, low cost, and improved electrochemical activity. Effect

Active Publication Date: 2021-09-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a lithium squarylate and lithium squarylate in order to overcome the cumbersome preparation process of lithium squarylate in the prior art and the size of the lithium squarylate prepared is mostly micron-scale, easy to agglomerate, and have low electrochemical performance. Its preparation method and application

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  • Lithium squarate and preparation method and application thereof
  • Lithium squarate and preparation method and application thereof
  • Lithium squarate and preparation method and application thereof

Examples

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Effect test

Synthetic example 1

[0059] Synthesis Example 1 prepared lithium squarylium by freezing in a refrigerator. The specific steps were as follows: 0.5800 g of squarylium and 0.3695 g of lithium carbonate were respectively dissolved in 50 ml of deionized water, and the aqueous solution of lithium carbonate was slowly added into the aqueous solution of squarylium in a water bath at 60 ° C. Stirring was maintained for 2 h after the addition was complete.

[0060] The solution was rotary evaporated at 60° C. until all the water was evaporated to obtain a white powder. Then the white powder was washed 3 times with absolute ethanol to remove excess squarylium therein to obtain a pure phase of lithium squarylium.

[0061] The pure phase of the above-mentioned lithium squarylate was dissolved in 20 ml of deionized water, quick-frozen in a freezer for 6 hours, and the quick-frozen solution was freeze-dried at -40° C. for 48 hours to obtain lithium squarylate.

Synthetic example 2

[0063] Synthesis Example 2: Lithium squarylium was prepared by quick-freezing with liquid nitrogen. The specific steps were as follows: 0.5800 g of squarylium and 0.3695 g of lithium carbonate were dissolved in 50 ml of deionized water respectively, and the aqueous solution of lithium carbonate was slowly added into the aqueous solution of squarylium in a water bath at 60 ° C. Stirring was maintained for 2 h after the addition was complete.

[0064] The solution was rotary evaporated at 60° C. until all the water was evaporated to obtain a white powder. Then the white powder was washed 3 times with absolute ethanol to remove excess squarylium therein to obtain a pure phase of lithium squarylium.

[0065] The pure phase of the above lithium squarylate was dissolved in 20 ml of deionized water, quick-frozen in liquid nitrogen for 2 minutes, and the quick-frozen solution was freeze-dried at -40° C. for 48 hours to obtain lithium squarylate.

[0066] The lithium squarylate materi...

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Abstract

The invention discloses lithium squarate and a preparation method and application thereof, and is characterized in that the preparation method comprises the following steps: mixing a lithium source aqueous solution and a squaric acid aqueous solution for reaction, further preparing a reaction product into powder, and sequentially dissolving with water, quick-freezing and freeze-drying. The lithium squarate is prepared by adopting the preparation method, and the thickness of the lithium squarate is 50-100nm. The preparation method is simple in process, and the uniform nanosheet with the thickness of 50-100nm is obtained only through simple freeze-drying treatment. The decomposition voltage of the prepared lithium squarate is greatly reduced, meanwhile, the electrochemical activity is greatly improved, in addition, the lithium squarate can also be used as a lithium supplementing agent to be applied to a lithium-sulfur battery and / or a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a lithium squarylate and its preparation method and application. Background technique [0002] When the lithium-ion battery is activated during the first cycle of charging, lithium ions will be extracted from the positive electrode material and embedded in the negative electrode material. In this process, the battery will consume a part of lithium ions to form a solid electrolyte film (SEI film) on the surface of the negative electrode. This part of the consumed lithium ions will undoubtedly directly cause the loss of battery capacity. At present, most commercial batteries on the market use graphite as the negative electrode. The irreversible capacity loss of graphite is generally about 10%, which is acceptable, but for silicon-based and tin-based negative electrodes with high specific capacity, the irreversible capacity loss is generally above 30%. , which un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/61C07C49/707H01M4/62H01M10/052H01M10/0525B82Y40/00B82Y30/00
CPCC07C45/61C07C49/707H01M4/62H01M10/052H01M10/0525B82Y40/00B82Y30/00C07C2601/04Y02P70/50
Inventor 胡彦杰江浩李春忠沈博磊朱承贤
Owner EAST CHINA UNIV OF SCI & TECH
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