Nanometer silicon composite negative electrode material used 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 conductive network collapse, aggravated silicon corrosion and capacity attenuation, difficult surface analysis of lithium, etc., to alleviate the effect of volume expansion and contraction , High initial charge and discharge efficiency, environmentally friendly and pollution-free effect

Inactive Publication Date: 2018-09-28
HUNAN SHINZOOM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silicon has an ultra-high theoretical specific capacity (4200mAh/g) and a low delithiation potential (<0.5V), and the voltage platform of silicon is slightly higher than that of graphite. It is difficult to cause lithium precipitation on the surface during charging, and the safety performance is better. Silicon has become one of the potential choices for the replacement of carbon-based anodes in lithium-ion batteries, but silicon also has disadvantages as an anode material for lithium-ion batteries: (1) Silicon materials are prone to volume expansion during charging and discharging, resulting in the collapse of the conductive network and affecting the battery life. Cycle performance; (2) Silicon is a semiconductor material with low electrical conductivity. During the charge-discharge cycle, the dei

Method used

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  • Nanometer silicon composite negative electrode material used for lithium ion battery
  • Nanometer silicon composite negative electrode material used for lithium ion battery
  • Nanometer silicon composite negative electrode material used for lithium ion battery

Examples

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Embodiment 1

[0065] A preparation method of nano-silicon composite negative electrode material for lithium ion battery, comprising the steps of:

[0066] A1. Add aminopropyltrimethoxysilane to a flask of nano-silica powder with a medium particle size of 100nm dispersed in an ethanol solvent and mix it. The mixing mass ratio is 1:20, and then put it into an ultrasonic cleaner for 4 hours of ultrasonication. The frequency is adjusted to 40kHZ, and the modified nano-silicon slurry is obtained.

[0067] A2. Add artificial graphite powder with a medium particle size of 10 μm to the modified nano-silicon slurry and mix it with a mixing mass ratio of 1:1. After mixing, put it into a planetary ball mill in a 5L stainless steel tank, and feed it with argon protective gas. High-energy ball milling under the condition of 200r / min for 10h, and then spray-dried to obtain a nano-silicon / graphite precursor.

[0068] A3. Stir and disperse the nano-silicon / graphite in an ethanol solvent for 1 h, add graph...

Embodiment 2

[0072] A preparation method of nano-silicon composite negative electrode material for lithium ion battery, comprising the steps of:

[0073] A1, add the silane coupling agent to the nano-silica powder flask with a medium particle size of 100nm dispersed in ethanol solvent and mix, the mixing mass ratio is 1:15, then put it into an ultrasonic cleaner for ultrasonic 6h, and the ultrasonic frequency is adjusted to 40kHZ, the modified nano-silicon slurry is obtained.

[0074] A2. Add artificial graphite powder with a medium particle size of 10 μm to the modified nano-silicon slurry and mix it with a mixing mass ratio of 2:1. After mixing, put it into a planetary ball mill in a 5L stainless steel tank, and feed it with argon protective gas. High-energy ball milling at 200 r / min for 20 hours, and then spray drying to obtain nano-silicon / graphite.

[0075] A3. Stir and disperse the nano-silicon / graphite in an ethanol solvent for 1 h, add graphene oxide with 100 layers into the nano-...

Embodiment 3

[0078] A preparation method of nano-silicon composite negative electrode material for lithium ion battery, comprising the steps of:

[0079] A1. Add the silane coupling agent to the nano-silica powder flask with a medium particle size of 200nm dispersed in the ethylene-propanol solvent and mix it. The mixing mass ratio is 1:20, and then put it into an ultrasonic cleaner for 8h ultrasonic cleaning. Adjust to 40kHZ to obtain the modified nano-silicon slurry.

[0080] A2. Add artificial graphite powder with a medium particle size of 15 μm to the modified nano-silicon slurry and mix it with a mixing mass ratio of 3:1. After mixing, put it into a planetary ball mill in a 5L stainless steel tank, and feed it with argon protective gas. High-energy ball milling at 500 r / min for 10 h, and then spray drying to obtain nano silicon / graphite.

[0081] A3. Stir and disperse the nano-silicon / graphite in an ethanol solvent for 3 hours, add graphene oxide with 200 layers into the nano-silicon...

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Abstract

The invention relates to a nanometer silicon composite negative electrode material used for a lithium ion battery. The composite negative electrode material adopts an ''egg'' model structure, whereinthe egg yolk comprises a graphite substrate and a nanometer silicon material uniformly dispersed in the interior and on the surface of the graphite substrate; the egg white is graphene uniformly dispersed on the surfaces of the graphite substrate and the nanometer silicon; and the egg shell is a conductive carbon coating layer. By combination of nanometer compounding, surface medication and surface coating technologies, the silicon alloy negative electrode material with the ''egg'' model structure is prepared, and the negative electrode material has high specific capacity, high initial charging-discharging efficiency and excellent cycle stability; and the preparation process is simple, environment friendly and free of pollution.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a nano-silicon composite negative electrode material for lithium ion batteries, a preparation method thereof, and a lithium ion battery prepared by using the negative electrode material. Background technique [0002] At present, with the shortage of global oil resources and the continuous deterioration of the climate environment, the development of clean and energy-saving new energy vehicles has been highly valued by countries all over the world. The key to the development of new energy vehicles lies in their power sources. At present, commercial lithium-ion batteries mainly use graphite-based negative electrode materials, but its theoretical specific capacity is only 372mAh / g, which cannot meet the demand for high energy density of lithium-ion batteries in the future. Therefore, the development of new high-performance electrode materials has become a r...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 李能皮涛黄越华王志勇肖志平李钰邵浩明
Owner HUNAN SHINZOOM TECH
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