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Silicon-based composite negative electrode material for lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of nano-silicon material agglomeration and volume change fragmentation, and achieve good electrochemical stability and stable material structure.

Active Publication Date: 2014-12-24
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to realize the high cycle performance stability of silicon-based negative electrode materials by solving the problem of fragmentation caused by the agglomeration and volume change of nano-silicon materials in silicon-based negative electrode composite materials; on top of this goal, the present invention proposes a A kind of silicon-based composite negative electrode material used in lithium-ion battery with novel structure and preparation method thereof

Method used

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  • Silicon-based composite negative electrode material for lithium ion battery
  • Silicon-based composite negative electrode material for lithium ion battery
  • Silicon-based composite negative electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Get 0.84g of silicon nanoparticles (particle diameter D50 is 30nm) and disperse in 8g of liquid vinyl tris (2-methoxyethoxy) silane monomer compound and stir for 6h. Add 1 mL of deionized water with a pH of 6.8, and keep stirring for 24 hours, add 12.32 g of phenolic resin ethanol solution with a mass fraction of 50%, continue stirring for 48 hours, and heat it to 80 ° C for 48 hours to remove the solvent while stirring The mixed solution is allowed to solidify.

[0040] The obtained cured precursor was treated at 750°C for 1h in a protective atmosphere, and then calcined at 1050°C for 1.5h to obtain a theoretical stoichiometric ratio of 1.86Si-SiO 1.5 C 8.7 Si-based composite bulk material.

[0041] The obtained silicon-oxygen-carbon composite material was magnetically crushed for 1 min, and processed under a planetary ball mill at 500 rpm for 12 h to obtain a negative electrode material for a lithium-ion battery with a particle size D90 of less than 30 μm. The scann...

Embodiment 2

[0044] Get 1.78g of silicon nanoparticles (particle diameter D50 is 30nm) and disperse in 8g of liquid vinyl tris (2-methoxyethoxy) silane monomer compound and stir for 12h. Add 2 mL of deionized water with a pH of 6.8, and keep stirring for 48 hours, add 12.32 g of phenolic resin ethanol solution with a mass fraction of 50%, continue stirring for 48 hours, and heat to 80 ° C for 48 hours to remove the solvent while stirring The mixed solution is allowed to solidify.

[0045] The obtained cured precursor was treated at 750 °C for 1 h in a protective atmosphere, and then calcined at 1050 °C for 1.5 h to obtain a theoretical stoichiometric ratio of 3.31 Si-SiO 1.5 C 8.7 Si-based composite bulk material. The obtained composite material was crushed by magnetic force for 1min, and processed under a planetary ball mill at 500rpm for 12h to obtain a lithium-ion battery negative electrode material with a particle size D90 lower than 30 μm. The X-ray diffraction pattern of the materi...

Embodiment 3

[0048] Get 0.422g of silicon nanoparticles (particle diameter D50 is 30nm) and disperse in 8g of liquid vinyl tris (2-methoxyethoxy) silane monomer compound and stir for 3h. Add 1 mL of deionized water with a pH of 6.8, and keep stirring for 12 hours, add 12.32 g of phenolic resin ethanol solution with a mass fraction of 50%, and continue stirring for 24 hours. While stirring, heat at 150°C for 0.5 hours to remove The solvent solidifies the mixed solution.

[0049] The obtained cured precursor was treated at 750 °C for 1 h in a protective atmosphere, and then calcined at 1050 °C for 1.5 h to obtain a theoretical stoichiometric ratio of 0.93 Si-SiO 1.5 C 8.7 Si-based composite bulk material. The obtained composite material was crushed by magnetic force for 1 min, and processed under a planetary ball mill at 500 rpm for 12 h to obtain a silicon-based lithium-ion battery negative electrode material with a particle size D90 of less than 30 μm.

[0050] The preparation method of...

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Abstract

The invention relates to a silicon-based composite negative electrode material for a lithium ion battery, wherein a silicon-containing material with the size of less than 0.3 [mu]m is dispersed uniformly in a porous silicon oxygen carbon skeleton. The invention also provides a method for preparing the composite negative electrode material, wherein the method includes the steps: dispersing the silicon-containing material in a liquid organo-siloxane monomer, successively adding an ethanol-water acidic solution, a curing agent and an amorphous carbon source precursor solution into the dispersion liquid, and carrying out heat preservation to make the mixed solution cured; carrying out high temperature calcination on the precursor after curing in a protective atmosphere, to obtain a bulk silicon-based composite material; and crushing the bulk silicon-based composite material by ball milling to obtain the silicon-based lithium ion battery negative electrode material having various different particle sizes. The silicon-containing material in the silicon-based composite negative electrode material is firmly and evenly distributed in the porous silicon oxygen carbon skeleton, and the structure can effectively bear a volume effect brought by embedding and stripping of lithium and has the characteristics of adjustable charge / discharge specific capacity and high electrochemical cycle stability.

Description

technical field [0001] The invention relates to a highly dispersed silicon-based composite negative electrode material for lithium ion batteries and a preparation method thereof. technical background: [0002] Due to its performance advantages, lithium-ion batteries have been used in portable computers, mobile phones, cameras and other fields that require mobile power. With the development of lithium-ion batteries, high specific energy, long-life, and low-cost lithium-ion batteries that can be used in the field of electric vehicles will become the focus of research. At present, cathode materials such as lithium manganese oxide (LiMn 2 o 4 ), lithium cobaltate (LiCoO 2 ), lithium iron phosphate (LiFePO 4 ) and ternary materials have laid the foundation for this type of battery; however, the specific capacity of commercial negative electrode material carbon is close to the theoretical value of 372mAh / g, and it is difficult to increase it. Searching for high specific capac...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/362H01M4/483H01M4/62H01M10/0525Y02E60/10
Inventor 卢世刚王建涛杨娟玉王耀黄斌闫坤
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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