A modified silicon carbon negative electrode material and its preparation method and application

A carbon negative electrode material and negative electrode material technology, applied in the direction of negative electrode, active material electrode, silicon, etc., can solve the problems of complex process and high cost, achieve low cost and improve the effect of initial coulombic efficiency

Active Publication Date: 2022-02-18
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has high cost, complex process, and certain dangers, so there are many difficulties in its actual implementation.

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  • A modified silicon carbon negative electrode material and its preparation method and application
  • A modified silicon carbon negative electrode material and its preparation method and application
  • A modified silicon carbon negative electrode material and its preparation method and application

Examples

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Embodiment 1

[0043] This embodiment provides a method for preparing a modified silicon-carbon negative electrode material, the preparation method comprising the following steps:

[0044] (1) Mix silicon-carbon negative electrode material and lithium alkoxide solution at a solid-to-liquid ratio of 0.2:1, and perform a solvothermal reaction at 180° C. for 12 hours, and the unit of the solid-to-liquid ratio is g / mL;

[0045] (2) Alcohol washing step (1) The solid powder obtained after the solvothermal reaction was vacuum-dried at 60° C. for 24 hours to obtain a modified silicon-carbon negative electrode material;

[0046] The lithium alkoxide solution is mixed by metal lithium and alcohol solvent, the solid-liquid ratio of metal lithium and alcohol solvent is 1:1, and the unit of the solid-liquid ratio is mg / mL; the alcohol solvent is 2,2, 2-Trifluoroethanol.

[0047] The alcohol solvent used for the alcohol washing described in step (2) is the same as that used for configuring the lithium a...

Embodiment 2

[0050] This embodiment provides a method for preparing a modified silicon-carbon negative electrode material, the preparation method comprising the following steps:

[0051] (1) Mix silicon-carbon negative electrode material and lithium alkoxide solution at a solid-to-liquid ratio of 0.01:1, and perform a solvothermal reaction at 120° C. for 48 hours, and the unit of the solid-to-liquid ratio is g / mL;

[0052] (2) Alcohol washing step (1) The solid powder obtained after the solvothermal reaction was vacuum-dried at 70° C. for 20 hours to obtain a modified silicon-carbon negative electrode material;

[0053] The lithium alkoxide solution is mixed by metal lithium and alcohol solvent, the solid-liquid ratio of metal lithium and alcohol solvent is 0.1:1, and the unit of the solid-liquid ratio is mg / mL; the alcohol solvent is 2,2, 2-Trifluoroethanol.

[0054] The alcohol solvent used for the alcohol washing described in step (2) is the same as that used for configuring the lithiu...

Embodiment 3

[0057] This embodiment provides a method for preparing a modified silicon-carbon negative electrode material, the preparation method comprising the following steps:

[0058] (1) Mix silicon-carbon negative electrode material and lithium alkoxide solution at a solid-to-liquid ratio of 0.5:1, and perform a solvothermal reaction at 260° C. for 0.5 h, and the unit of the solid-to-liquid ratio is g / mL;

[0059] (2) Alcohol washing step (1) The solid powder obtained after the solvothermal reaction was vacuum-dried at 100° C. for 10 hours to obtain a modified silicon-carbon negative electrode material;

[0060] The lithium alkoxide solution is mixed by metal lithium and alcohol solvent, the solid-liquid ratio of metal lithium and alcohol solvent is 2:1, and the unit of the solid-liquid ratio is mg / mL; the alcohol solvent is 2,2, 2-Trifluoroethanol.

[0061] The alcohol solvent used for the alcohol washing described in step (2) is the same as that used for configuring the lithium alk...

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Abstract

The invention provides a modified silicon-carbon negative electrode material and its preparation method and application. The preparation method includes the following steps: (1) mixing the silicon-carbon negative electrode material and lithium alkoxide solution, and performing solvothermal reaction; (2) alcohol washing Step (1) The solid powder obtained after the solvothermal reaction is dried to obtain a modified silicon-carbon negative electrode material; the lithium alkoxide solution is formed by mixing metal lithium and an alcohol solvent. The preparation method provided by the invention has a simple process, and the pre-lithiation of the surface of the silicon-carbon negative electrode material can be realized through a simple solvothermal reaction, which reduces the irreversible capacity in the first charge and discharge process, and improves the first Coulombic efficiency to more than 92%.

Description

technical field [0001] The invention belongs to the technical field of batteries and relates to a negative electrode material, in particular to a modified silicon-carbon negative electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in daily life because of their high energy density, long cycle life, and low cost. However, the traditional graphite anode cannot meet the development requirements of the new energy field due to its low specific capacity. Therefore, the development of high specific capacity The negative electrode material is very important. [0003] At present, graphite is the most widely used anode material for lithium batteries, but its theoretical capacity is only 372mAh / g, which is difficult to meet the demand for high energy density. Silicon-based anode materials are considered to be one of the most potential anode materials for lithium-ion batteries due to their theoretical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/40H01M4/62H01M10/0525H01M10/42
CPCH01M4/386H01M4/625H01M4/405H01M10/0525H01M10/4235Y02E60/10C01B33/02H01M4/364H01M4/587H01M10/052H01M2004/027C01P2004/80
Inventor 任海亮王国光韩熠垚夏阳徐君
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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