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Silicon-carbon composite negative electrode material, and preparation method and application thereof

A silicon-carbon composite and anode material technology, applied in battery electrodes, recycling technology, structural parts, etc., can solve the problems of high cost, inability to realize large-scale application, high production cost, etc., and achieve low cost, good industrialization prospects, The effect of low dependence

Active Publication Date: 2021-12-21
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is expensive and cannot be applied on a large scale; at present, commercial graphite materials are usually used to prepare and produce silicon carbon anode materials, and the production cost is relatively high

Method used

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  • Silicon-carbon composite negative electrode material, and preparation method and application thereof
  • Silicon-carbon composite negative electrode material, and preparation method and application thereof
  • Silicon-carbon composite negative electrode material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The silicon-carbon composite material prepared in this embodiment specifically includes the following steps:

[0042]S1. Remove the shell of the waste lithium-ion battery, separate the positive and negative electrodes, collect the negative electrodes of multiple batteries, about 500g to be processed, and crush the recycled negative electrodes at a speed of 34000r / min. The time is 15 minutes, and then the crushed negative electrode sheet is sieved through a 300-mesh sieve, and the copper foil and graphite negative electrode powder are separated to obtain about 380 g of graphite negative electrode powder.

[0043] S2. 380g of graphite negative electrode powder is dissolved in 5mol / L sulfuric acid solution and stirred for 6h, the resulting solution is subjected to solid-liquid separation to remove residual metal ions, collect the solid precipitate, and repeatedly wash the solid precipitate with deionized water and absolute ethanol, Until the filtrate is neutral (pH=7), aft...

Embodiment 2

[0048] The silicon-carbon composite material prepared in this embodiment specifically includes the following steps:

[0049] S1. Remove the shell of the waste lithium-ion battery, separate the positive and negative electrodes, collect the negative electrodes of multiple batteries, about 500g to be processed, and crush the recycled negative electrodes at a speed of 34000r / min. The time is 15 minutes, and then the crushed negative electrode sheet is sieved through a 300-mesh sieve, and the copper foil and graphite negative electrode powder are separated to obtain about 380 g of graphite negative electrode powder.

[0050] S2. 380g of graphite negative electrode powder was dissolved in 5mol / L sulfuric acid solution and stirred for 4h, and the resulting solution was subjected to solid-liquid separation to remove residual metal ions, collect the solid precipitate, and repeatedly wash the solid precipitate with deionized water and absolute ethanol, Until the filtrate is neutral (pH=...

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PUM

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Abstract

The invention belongs to the technical field of battery materials, and discloses a silicon-carbon composite negative electrode material, and a preparation method and application thereof. The preparation method comprises the following steps: dissolving graphite negative electrode powder in an acid solution, carrying out solid-liquid separation, taking a precipitate, washing, drying, adding a reducing agent, and carrying out heat treatment to obtain a purified graphite material; and adding modified silicon powder into the graphite material, mixing, adding into a dimethyl formamide solution containing polyimide, stirring, distilling, and carbonizing to obtain the silicon-carbon composite negative electrode material. The recovered graphite negative electrode powder is purified by adopting an acid leaching mode, and the recovered graphite negative electrode powder is further purified by adding the reducing agent in the chlorine atmosphere for heat treatment, so that the purity of the recovered graphite powder is improved.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a silicon-carbon composite negative electrode material and a preparation method and application thereof. Background technique [0002] Due to the advantages of high voltage, high specific capacity, superior cycle performance, and light weight, lithium-ion battery materials are widely used and have broad application prospects. The market share is increasing, which also changes the resource demand. The shift from fossil fuels to lithium battery fuels and the increasing scarcity of this resource. [0003] With the rapid industrialization and rapid development of new energy vehicles, power lithium-ion batteries, one of the important components, are widely used. However, as the lithium-ion battery is continuously charged and discharged during use, the performance of the battery will gradually decay, and when the decay reaches a certain level, the battery will be...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M10/54
CPCH01M4/362H01M4/583H01M10/54Y02E60/10Y02W30/84H01M4/364H01M4/386H01M4/587H01M10/0525H01M4/0471H01M4/133H01M4/134H01M4/1393H01M4/1395B09B3/70B09B2101/16B09B3/35H01M2004/021H01M2004/027
Inventor 范霞李长东张振华毛林林阮丁山蔡勇
Owner GUANGDONG BRUNP RECYCLING TECH
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