Lithium ion battery silicon-carbon anode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of difficult dispersion of nano-silica powder, low initial efficiency of materials, and low initial efficiency

Active Publication Date: 2013-10-23
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN102683649A uses resorcinol and formaldehyde to form a carbon airgel coating layer with a porous structure on the surface of nano silicon powder and ultrafine graphite. Although the surface structure and cycle performance of silicon carbon materials have been improved, the specific surface area of ​​the material is large. The low efficiency for the first time limits its application in lithium batteries
CN101244814A Mix and carbonize asphalt solution, nano-silicon powder and spherical natural graphite to prepare silicon-carbon negative electrode material. This method is difficult to uniformly disperse nano-silicon powder, and the first-time efficiency of the prepared material is low

Method used

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  • Lithium ion battery silicon-carbon anode material and preparation method thereof
  • Lithium ion battery silicon-carbon anode material and preparation method thereof
  • Lithium ion battery silicon-carbon anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Put D 50 10g of silicon powder with a particle size of 130nm, add it to a mixed solution of ethanol and acetone with a mass ratio of 8:2, the mass of the mixed solution is 100g, and then add 0.3g of cetyltrimethylammonium bromide to mix In solution; then at a frequency of 30kHz and a power density of 1.2W / cm 2 In the ultrasonic equipment, ultrasonic stirring is performed for 15 minutes to form a uniform nano-silicon suspension.

[0063] (2) Dissolve 17.5 g of lauric acid in 175 g of methanol, and slowly drop the lauric acid solution into the nano-silicon suspension, stir in a disperser at 1500 rpm for 1 h; then add 80 g of D 50 Artificial graphite with a particle size of 1 μm is added to it, and stirring is continued for 3 hours to obtain a uniformly mixed slurry. The slurry is dried to obtain a nano silicon / graphite polymer.

[0064] (3) Dissolve 25 grams of phenolic resin in 500g of ethanol to form a phenolic resin solution, and slowly add the nano silicon / graphite pol...

Embodiment 2

[0077] (1) Put D 50 10 grams of nano silicon powder with a particle size of 30nm is added to 1000 grams of ethanol solution, and then 0.5g of polyoxyethylene sorbitan monooleate is added to the solution, the frequency is 40kHz, the power density is 1.2W / cm 2 In the ultrasonic equipment, ultrasonic for 30 minutes to form a uniform nano-silicon suspension.

[0078] (2) Dissolve 30 grams of tetradecanoic acid in 150g ethanol, slowly drip the tetradecanoic acid solution into the nano-silicon suspension, and stir for 2h in a disperser with a rotating speed of 500rpm; then, the 100g D50 particle size is 0.5μm artificial graphite was added to it, and stirring was continued for 5 hours to obtain a uniformly mixed slurry. The slurry is dried to obtain a nano silicon / graphite polymer.

[0079] (3) Dissolve 50 g of pitch in 300 g of tetrahydrofuran to form a pitch suspension, and slowly add the nano-silicon / graphite polymer to the pitch suspension, stir at 2000 rpm for 1 hour to obtain a unif...

Embodiment 3

[0088] (1) Put D 50 10 grams of nano silicon powder with a particle size of 200nm is added to the mixed solution of isopropanol and methanol with a mass ratio of 9:1. The mass of the mixed solution is 50 grams, and then 0.03g of polyethylene glycol is added to the mixed solution. Isooctyl phenyl ether, the frequency is 10kHz, the power density is 1.2W / cm 2 In the ultrasonic equipment, ultrasonic stirring is performed for 10 minutes to form a uniform nano-silicon suspension.

[0089] (2) Dissolve 5 grams of arachidic acid in 100g of a mixed solution of ethanol and acetone with a mass ratio of 9:1, and slowly drop the arachidic acid solution into the nano-silicon suspension, in a disperser with a rotation speed of 2000 rpm Stir for 0.5h; then add 50g D 50 Natural graphite with a particle size of 10 μm is added, and stirring is continued for 1 hour to obtain a uniformly mixed slurry. The slurry is dried to obtain a nano silicon / graphite polymer.

[0090] (3) Dissolve 15 grams of poly...

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Abstract

The invention relates to a lithium ion battery silicon-carbon anode material which comprises nanometer silicon, graphite polymer and organic matter pyrolysis carbon, wherein the graphite polymer is formed by granular graphite; the nanometer silicon is embedded and clamped among gaps of the granular graphite or attached on the surface of the granular graphite; nanometer silicon/graphite polymer is covered by the organic matter pyrolysis carbon. A preparation method of the lithium ion battery silicon-carbon anode material comprises the steps of: mixing the nanometer silicon, a dispersing agent, a bonding agent and the granular graphite in an organic solvent, and drying to obtain composite nanometer silicon/graphite polymer; adding the obtained composite nanometer silicon/ graphite polymer into the dispersion liquid of a carbon source precursor, mixing and drying; and carrying out heat treatment on material to obtain the lithium ion battery silicon-carbon anode material. The prepared silicon-carbon material has high specific capacity, high first time efficiency and excellent cycle performance, the capacity is larger than 450mAh/g, the first time efficiency is more than 85%, and the capacity retention ratio is more than 97% after circulation is carried out for 60 times.

Description

Technical field [0001] The present invention relates to the field of lithium ion batteries, in particular, the present invention relates to a silicon carbon anode material for lithium ion batteries and a preparation method thereof. Background technique [0002] With the rapid economic development, the global energy situation is becoming increasingly severe. The demand for traditional disposable energy such as coal and oil continues to increase, and the damage to the global ecological environment is also increasing. Therefore, the development and application of clean, low-carbon, environmentally friendly, and renewable energy has become an urgent task for mankind to explore together. With the development of energy storage technology, the application of renewable energy such as wind energy and solar energy has been greatly improved. At present, research on hotter energy storage lithium-ion batteries has been widely used in portable electronic devices such as notebooks and smart ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/62H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 岳敏何鹏李胜任建国黄友元
Owner BTR NEW MATERIAL GRP CO LTD
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