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A kind of preparation method of lithium battery modified silicon-based negative electrode material

A technology of negative electrode material and modified silicon, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problem that silicon-based negative electrodes are difficult to adapt to fast charging, so as to improve tolerance, charge and discharge speed, and improve compound speed. Effect

Active Publication Date: 2020-12-01
东营市东凯新材料技术研发有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the shortcomings of existing silicon-based negative electrodes that are difficult to adapt to fast charging and the lithium ion transmission problem brought about by the fast charging process, the present invention provides a method for preparing a modified silicon-based negative electrode material for lithium batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of a lithium battery modified silicon-based negative electrode material of the present invention comprises the following steps:

[0027] (1) Dissolve magnesium nitrate, aluminum nitrate, sodium silicate and sodium lauryl sulfate in distilled water, add citric acid to adjust the pH value to 4, then add acrylonitrile monomer and initiator dibenzoyl peroxide , stir rapidly until the solution is completely emulsified to obtain an emulsion, then raise the temperature to 80°C and slowly add dropwise a mixed solution of sodium hydroxide and sodium silicate with a mass ratio of 15:6, the sodium hydroxide and sodium silicate The dripping amount of the mixed solution is 6% of the volume of the emulsion; the pH is controlled to be 8, and the precipitate is filtered for 5 hours to obtain the hydrotalcite with the organic phase tightly compounded; the magnesium nitrate, aluminum nitrate, sodium silicate, dodecane The solid-to-liquid ratio of sodium bisulphate an...

Embodiment 2

[0031] A preparation method of a lithium battery modified silicon-based negative electrode material of the present invention comprises the following steps:

[0032](1) Dissolve magnesium nitrate, aluminum nitrate, sodium silicate and sodium lauryl sulfate in distilled water, add citric acid to adjust the pH value to 4, then add acrylonitrile monomer and initiator dibenzoyl peroxide , stir rapidly until the solution is completely emulsified to obtain an emulsion, then heat up to 80°C and slowly add a mixed solution of sodium hydroxide and sodium silicate with a mass ratio of 10:3, the sodium hydroxide and sodium silicate The dripping amount of the mixed solution is 3% of the volume of the emulsion; the pH is controlled to be 9, and the precipitate is filtered for 6 hours to obtain a hydrotalcite with an organic phase tightly compounded; the magnesium nitrate, aluminum nitrate, sodium silicate, dodecane The solid-to-liquid ratio of sodium sulfate and water is 15:12:7:17:80; the ...

Embodiment 3

[0036] A preparation method of a lithium battery modified silicon-based negative electrode material of the present invention comprises the following steps:

[0037] (1) Dissolve magnesium nitrate, aluminum nitrate, sodium silicate and sodium lauryl sulfate in distilled water, add citric acid to adjust the pH value to 4, then add acrylonitrile monomer and initiator dibenzoyl peroxide , stirring rapidly until the solution is completely emulsified to obtain an emulsion, then warming up to 80°C and slowly adding a mixed solution of sodium hydroxide and sodium silicate with a mass ratio of 12:7, the sodium hydroxide and sodium silicate The dripping amount of the mixed solution is 10% of the volume of the emulsion; the pH is controlled to be 8.5, and the precipitate is filtered for 6 hours to obtain the hydrotalcite with the organic phase tightly compounded; the magnesium nitrate, aluminum nitrate, sodium silicate, dodecane The solid-to-liquid ratio of sodium sulfate and water is 14...

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Abstract

The invention belongs to the technical field of lithium ion battery negative electrodes, and specifically relates to a preparation method of a lithium battery modified silicon-based negative electrodematerial. The preparation method of the lithium battery modified silicon-based negative electrode material comprises the steps of (1) dissolving magnesium nitrate, aluminum nitrate, sodium silicate and sodium lauryl sulfate in distilled water, adding citric acid to adjust the pH value to 4, adding an acrylonitrile monomer and an initiator, and dropwise adding a mixed solution of sodium hydroxideand sodium silicate to obtain organic phase closely-compounded hydrotalcite; and (2) blending and pressing the organic phase closely-compounded hydrotalcite and graphene into a sheet, forming a carbonfiber with a graphite phase after pre-oxidation and high-temperature carbonization, spraying a layer of magnesium powder on the surface of the sheet, carrying out heating treatment for 30 minutes, and then cooling and washing to obtain the required negative electrode material. The negative electrode material prepared by the invention has a relatively wide interlayer spacing, and nano silicon witha relatively large specific surface area is embedded between graphite-phase carbon layers, so that the endurance capacity and the charging and discharging speed of the negative electrode under a fastcharging condition are improved.

Description

technical field [0001] The invention belongs to the technical field of negative poles of lithium ion batteries, and in particular relates to a preparation method of modified silicon-based negative pole materials for lithium batteries. Background technique [0002] Lithium-ion battery is a high-energy secondary battery that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. With the rapid development of electronic portable devices and electric vehicles, it is particularly critical to research and develop high-performance lithium-ion batteries. Lithium-ion batteries are mainly composed of four parts: positive electrode materials, negative electrode materials, separators, and electrolytes. Among them, positive electrode materials are the key to determining battery performance and cost in commercial lithium-ion batteries. At present, the mainstream anode materials are carbon-based and silicon-based. The silicon anode for lithium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525
CPCH01M4/362H01M4/386H01M4/587H01M10/0525H01M2004/027Y02E60/10
Inventor 陈庆廖健淞
Owner 东营市东凯新材料技术研发有限责任公司
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