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A kind of negative electrode aqueous lithium supplement additive and preparation method thereof

An additive, water-based technology, applied in battery electrodes, secondary battery repair/maintenance, structural parts, etc., can solve problems such as cost increase, efficiency reduction, and inability to use negative electrode lithium supplementation additives, achieving easy operation, improving first efficiency, Improve the effect of gram capacity

Active Publication Date: 2020-08-18
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the negative electrode lithium supplement additives prepared by the existing method can not be used in the aqueous environment, therefore cannot meet the requirements of the aqueous homogenate environment in the actual production process, leading to the problems of increased cost and reduced efficiency, the present invention provides a simple and efficient negative electrode Preparation method of water-based lithium supplement additive

Method used

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  • A kind of negative electrode aqueous lithium supplement additive and preparation method thereof
  • A kind of negative electrode aqueous lithium supplement additive and preparation method thereof
  • A kind of negative electrode aqueous lithium supplement additive and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] Mix 1.0g of polytetrafluoroethylene with 100.0g of deionized water, and stir thoroughly for 30 minutes to form a stable glue. Then, add 5.0 g of silicon powder to the glue, stir it ultrasonically to completely immerse it, let it stand for 2 minutes, filter it, and dry it in a vacuum oven at 45°C to obtain product A. In an environment with a dew point of -40°C, the above-mentioned product A was mixed with 25.0 g of pure lithium liquid under an argon atmosphere, and kept reacting at 185°C for 20 minutes, then cooled and left for 30 minutes to form product B. Then add product B and 0.1g graphite oxide to the mixed solution of ethanol and deionized water (V:V=5:5), and transfer to the microwave reactor, adjust the microwave power to 360W, and heat the mixed solution to the reflux state , slowly add 0.3g ascorbic acid to it, keep the reaction for 15min after the dropwise addition, cool at room temperature, centrifuge, collect the precipitate, wash, and vacuum-dry to obtain t...

Embodiment 2

[0035] Mix 2.0g polyvinylidene fluoride with 100.0g deionized water, stir well for 30min to form a stable glue. Then add 10.0g of silicon powder to the glue, stir it ultrasonically to completely immerse it, let it stand for 8 minutes, filter it, and dry it in a vacuum oven at 45°C to obtain product A. In an environment with a dew point of -45°C, the above-mentioned product A was mixed with 48.0 g of pure lithium liquid under an argon atmosphere, and kept reacting at 190°C for 25 minutes, then cooled and left for 30 minutes to form product B. Then add product B and 0.2g graphite oxide to the mixed solution of ethanol and deionized water (V:V=6:4), and transfer to the microwave reactor, adjust the microwave power to 400W, and heat the mixed solution to the reflux state , slowly add 0.7g of hydrazine hydrate to it, keep the reaction for 20min after the dropwise addition, cool at room temperature, centrifuge, collect the precipitate, wash, and vacuum dry to obtain the product.

Embodiment 3

[0037]Mix 3.0g of FEP with 100.0g of deionized water, stir well for 25min to form a stable glue. Then add 5.0g of silicon powder to the glue, stir it ultrasonically to completely immerse it, let it stand for 5 minutes, filter it, and dry it in a vacuum oven at 45°C to obtain product A. In an environment with a dew point of -40°C, the above product A was mixed with 30.0 g of pure lithium liquid under an argon atmosphere, and kept reacting at 180°C for 20 minutes, then cooled and left for 30 minutes to form product B. Then add product B and 0.1g graphite oxide to the mixed solution of ethanol and deionized water (V:V=8:2), and transfer to the microwave reactor, adjust the microwave power to 300W, and heat the mixed solution to reflux , slowly add 0.2g of ammonia water and 0.4g of hydrazine hydrate to it, keep the reaction for 15min after the dropwise addition, cool at room temperature, centrifuge, collect the precipitate, wash, and vacuum-dry to obtain the product.

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Abstract

The invention relates to a negative electrode aqueous lithium supplement additive and a preparation method thereof. The lithium supplement additive has a core-shell structure, and the chemical formulais LixSi@Liy[M]@graphene, wherein x is more than or equal to 0.1 and less than or equal to 4.4, M is more than or equal to 1 and less than or equal to 2, M is F<-> ions or F<-> and CO3<2-> ions, andgraphene is a layer of film with 20 carbon atoms or less. The negative electrode lithium supplement additive is more stable, can stably and safely exists in an aqueous solvent, and better adapts to the current water-based homogenate environment of a negative electrode. Furthermore, the lithium supplement additive has excellent conductivity and high gram capacity exertion, and greatly compensates for part of positive electrode lithium ions lost due to the formation of a solid electrolyte interface (SEI) film in a first charging process. Therefore, the lithium supplement additive can improve thefirst charge-discharge efficiency, discharge capacity and cycle performance, and is especially suitable for a negative electrode system with a lower initial charge and discharge efficiency.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a negative electrode water-based lithium supplement additive and a preparation method thereof. Background technique [0002] During the first charging process of a lithium-ion battery, part of the electrolyte undergoes a reduction reaction on the surface of the negative electrode with a lower potential, and at the same time combines with the lithium ions released from the positive electrode to form a solid electrolyte membrane (SEI) with a thickness of about 100nm. The formation of SEI leads to a reduction in the first efficiency of the lithium-ion battery, usually 10-20%, resulting in a decrease in the discharge capacity of the lithium-ion battery. In order to improve the optimized capacity, the current effective method to solve the low first effect is mainly to use lithium supplement additives. Lithium-supplementing additive is a lithium-co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/42H01M10/0525
CPCH01M4/62H01M4/624H01M10/0525H01M10/4235Y02E60/10
Inventor 严涛翟传鑫徐子福张明慧
Owner 安普瑞斯(无锡)有限公司
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