Manufacturing method of film layer-structure pre-lithiation silicon carbon negative electrode

A technology of pre-lithiated silicon carbon and film layer structure, which is applied to negative electrodes, structural parts, battery electrodes, etc., can solve the problems of unstable electrode structure and low first coulomb efficiency of silicon carbon negative electrodes, and achieves convenient processing and economic benefits. Significant and improved Coulombic efficiency

Active Publication Date: 2019-07-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of the prior art, the present invention proposes a method for manufacturing a pre-lithiated film-structured silicon-carbon negative electrode to solve the problems of low initial Coulombic efficiency and unstable electrode structure of the silicon-carbon negative electrode

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  • Manufacturing method of film layer-structure pre-lithiation silicon carbon negative electrode
  • Manufacturing method of film layer-structure pre-lithiation silicon carbon negative electrode
  • Manufacturing method of film layer-structure pre-lithiation silicon carbon negative electrode

Examples

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Embodiment 1

[0024] A method for preparing a film-structured pre-lithiated silicon-carbon material electrode, comprising the following steps:

[0025] (1) Add 50 mg of silicon carbon material, 20 mg of graphene, 20 mg of carbon nanotube, 10 mg of carbon nanofiber, and 10 mg of sodium dodecylbenzenesulfonate into 50 mL of anhydrous acetonitrile, mechanically stir for 2 h, and ultrasonically disperse for 0.5 h to obtain stable , Uniform dispersion a, the concentration of the dispersion is 2mg / mL;

[0026] (2) Add 5 mg of lithium phosphide, 5 mg of carbon nanotubes, 10 mg of carbon nanofibers, 10 mg of graphene, and 10 mg of polyvinylpyrrolidone into 20 mL of anhydrous toluene, mechanically stir for 2 h, and ultrasonically disperse for 0.5 h to obtain a stable and uniform dispersion b, the concentration of the dispersion is 1.5mg / mL;

[0027] (3) Suction-filter the dispersions a and b in sequence, each time the volume of the dispersion is 20mL, to obtain a pre-lithiated silicon carbon negati...

Embodiment 2

[0030] A method for preparing a film-structured pre-lithiated silicon-carbon material electrode, comprising the following steps:

[0031] (1) Add 4g of silicon-carbon material, 0.5g of carbon nanotubes, 0.5g of carbon nanofibers, and 0.2g of stearic acid into 100mL of absolute ethanol, mechanically stir for 12 hours, and ultrasonically disperse for 3 hours to obtain a stable and uniform dispersion a. The concentration of the dispersion is 50mg / mL;

[0032] (2) Add 0.4g of lithium phosphide, 0.05g of carbon nanotubes, 0.05g of carbon nanofibers, and 0.3g of sodium octadecyl sulfate into 50mL of anhydrous acetonitrile, mechanically stir for 6 hours, and ultrasonically disperse for 3 hours to obtain a stable and uniform Dispersion b, the concentration of the dispersion is 10mg / mL;

[0033] (3) Sequentially cross suction filter the dispersion liquid a and b twice each, and finally suction filter the dispersion liquid a once again. The volume of the dispersion liquid taken by each...

Embodiment 3

[0037] A method for preparing a film-structured pre-lithiated silicon-carbon material electrode, comprising the following steps:

[0038] (1) Add 4g of silicon carbon material, 0.5g of carbon nanotubes, 0.5g of graphene, and 0.1g of polyvinylpyrrolidone into 50mL of anhydrous acetonitrile, mechanically stir for 5 hours, and ultrasonically disperse for 1 hour to obtain a stable and uniform dispersion a. Liquid concentration is 100mg / mL;

[0039] (2) Add 10 mg of lithium phosphide, 20 mg of carbon nanotubes, 20 mg of graphene, and 2 mg of hexadecyltrimethylammonium bromide into 100 mL of anhydrous toluene, magnetically stir for 0.5 h, and ultrasonically disperse for 0.1 h to obtain stable and uniform Dispersion b, the concentration of the dispersion is 0.5mg / mL;

[0040] (3) Cross suction and filter the dispersion liquids a and b three times in sequence, and the volume of the dispersion liquid taken by each suction filtration is 10mL to obtain a pre-lithiated silicon carbon neg...

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Abstract

The invention provides a manufacturing method of a film layer-structure pre-lithiation silicon carbon negative electrode. The pre-lithiation silicon carbon negative electrode is manufactured by the steps of dispersing a silicon carbon material in a non-aqueous organic solvent, filtering to fabricate a silicon carbon negative electrode with a self-support structure, filtering a lithium phosphate dispersion liquid on a surface of the silicon carbon negative electrode to fabricate a pre-lithiation layer and performing lamination and assembly. Lithium ions consumed by formation of an SEI film during initial circulation of the silicon carbon material can be complemented by lithium phosphate contained in the pre-lithiation layer, the initial coulombic efficiency is remarkably improved, and the electrochemical performance of the battery is improved; and moreover, the lamination and assembly electrode is obtained by a filtering method, the process is simple, is convenient to operate and is safe and efficient, and actual application of the silicon carbon material is facilitated.

Description

technical field [0001] The invention relates to a method for manufacturing a pre-lithiated silicon-carbon negative electrode with a film layer structure, and belongs to the technical field of lithium-ion battery electrode manufacturing. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronic products, electric vehicles and other fields, traditional graphite anode materials have been difficult to meet people's demand for high-energy-density lithium-ion batteries. Silicon-based anode materials have the advantages of abundant reserves and high capacity, and are considered to be one of the most promising anode materials for next-generation lithium-ion batteries. However, silicon will produce a huge volume change during the intercalation / delithiation process, resulting in the destruction of the electrode structure and the continuous formation of the solid electrolyte film (SEI), resulting in poor cycle stability and low initia...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/1397H01M4/36H01M4/38H01M4/58H01M4/62H01M10/0525
CPCH01M4/1395H01M4/1397H01M4/366H01M4/386H01M4/5805H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 夏阳卢成炜方如意张文魁梁初黄辉甘永平张俊贺馨平
Owner ZHEJIANG UNIV OF TECH
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