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A kind of silicon carbon negative electrode material and preparation method

A negative electrode material, silicon carbon technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of large volume change and silicon-based material volume change, and achieve strong oxidation resistance, good stability, and enhanced electrical conductivity. sexual effect

Active Publication Date: 2021-01-05
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem of large volume changes of silicon-based materials in the lithium ion intercalation process in the prior art, one of the purposes of the embodiments of the present invention is to provide a silicon-carbon negative electrode material, the silicon-carbon material includes a catalytic graphite layer, and The three-dimensional expanded graphite coated inside the catalytic graphite layer, the three-dimensional expanded graphite is embedded with nano-silicon, which provides a buffer space for the volume expansion of silicon, and solves the problem of lithium-ion deintercalation of silicon-based materials in the prior art. volume change problem

Method used

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  • A kind of silicon carbon negative electrode material and preparation method
  • A kind of silicon carbon negative electrode material and preparation method
  • A kind of silicon carbon negative electrode material and preparation method

Examples

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Embodiment 1

[0053]This example provides a silicon-carbon negative electrode material, which includes a catalytic graphite layer and three-dimensional expanded graphite wrapped inside the catalytic graphite layer, and nano-silicon is embedded in the three-dimensional expanded graphite.

[0054] Wherein, the catalytic graphite layer refers to the catalytic graphite layer formed after metal catalysis.

Embodiment 2

[0056] This example provides the preparation method of expanded graphite, specifically:

[0057] The commercial material mesophase carbon microspheres are prepared into graphite oxide by the classic Hummer’s method, and then the graphite oxide is sintered in a tube furnace at 950°C for 10 to 30 minutes to obtain expanded graphite.

[0058] Wherein, the preparation method of graphite oxide is:

[0059] (1) Put mesocarbon microspheres and 2.5 g of sodium nitrate in a 1000 mL three-necked flask, add sulfuric acid, and stir for 15 min;

[0060] (2) Lower the reaction temperature to 4°C, slowly add 16gKMnO 4 , stirring at low temperature for 3h;

[0061] (3) Raise the reaction temperature to 35°C, stir at medium temperature for 3h, and add 200mL of deionized water;

[0062] (4) The reaction temperature was raised to 98°C, and 15 mL of 30% H 2 o 2 , stirring at high temperature for 5h;

[0063] (5) cooling to room temperature, centrifuging and washing and separating the reacti...

Embodiment 3

[0065] This example provides the preparation method of silicon carbon negative electrode material, and the steps include:

[0066] S1: After mixing the expanded graphite, nano-silicon, carbon source and catalyst precursor, heating and evaporating to dryness to obtain the precursor;

[0067] S2: sintering the precursor in step S1 under an inert atmosphere and then washing and drying to obtain a silicon-carbon negative electrode material.

[0068] In step S1, during the mixing process of the nano-silicon and the expanded graphite, the nano-silicon enters into the three-dimensional layered structure of the expanded graphite.

[0069] In step S2, the carbon source is sintered under the action of the metal catalyst to generate catalytic graphite, which is evenly coated on the surface of the three-dimensional expanded graphite.

[0070] Wherein, the average particle size D50 of nano-silicon is less than 100nm.

[0071] Carbon sources include glucose, sucrose, starch, citric acid, ...

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Abstract

The embodiment of the invention provides a silicon-carbon negative electrode material and a preparation method thereof. The silicon-carbon negative electrode material comprises a catalytic graphite layer and three-dimensional expanded graphite coating the inner part of the catalytic graphite layer, wherein nanometer silicon is embedded in the three-dimensional expanded graphite. Catalytic graphiteis adopted to coat the three-dimensional expanded graphite and the silicon, a three-dimensional structure with the expanded graphite as the structure matrix is constructed, buffer space is provided for volume expansion of the silicon, the problem of volume change of the silicon-based material in a lithium ion deintercalation process in the prior art is solved, and the material is good in stability and high in oxidation resistance. The preparation method for the silicon-carbon negative electrode material is low in equipment requirement, low in energy consumption, simple in steps, high in controllability and easy for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a silicon-carbon negative electrode material and a preparation method. Background technique [0002] Lithium-ion batteries are currently the most promising secondary batteries due to their high performance, high safety and environmental friendliness. The energy density of the battery mainly depends on the electrode material. Graphite, as the anode material of commercial lithium-ion batteries, has safety problems caused by its low theoretical specific capacity (372mAh / g) and very low working voltage (close to Li / Li+). Traditional graphite anodes can no longer meet the energy density requirements of next-generation lithium-ion batteries. [0003] Silicon-based materials are considered to be the most potential substitute for graphite because of their high theoretical specific capacity (3579mAh / g), low delithiation potential (0.02-0.6Vvs.Li+ / Li), envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 尹周澜马兴月丁治英童汇张东材喻帅李由
Owner CENT SOUTH UNIV
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