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Method for preparing silicon carbide composite particles and application thereof as cathode material of lithium ion battery

A silicon-carbon composite and particle technology, used in battery electrodes, circuits, electrical components, etc., can solve problems such as poor material uniformity, poor silicon dispersion, and poor silicon-carbon interface contact, and achieve poor cyclability and practicality. high effect

Active Publication Date: 2010-12-29
BEIJING IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in silicon-carbon composite materials. The pyrolysis method, ball milling method, vapor deposition method and polymerization-pyrolysis method are usually used in the preparation. The material uniformity obtained by these methods is poor, and the silicon is dispersed in the carbon matrix. No, poor silicon-carbon interfacial contact

Method used

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  • Method for preparing silicon carbide composite particles and application thereof as cathode material of lithium ion battery
  • Method for preparing silicon carbide composite particles and application thereof as cathode material of lithium ion battery
  • Method for preparing silicon carbide composite particles and application thereof as cathode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1. Preparation of silicon-carbon composite particles and its electrochemical performance test

[0033] Press chitosan (weight-average molecular weight is 89000): the mass ratio of silicon quantum dots=50: 0.1 mixes, with water as solvent, stirs at room temperature more than 24h, obtains the mass concentration sum of chitosan and silicon quantum dots as 1% solution. Inject the polymer solution into the syringe of the electrostatic jet device, the nozzle is 20cm away from the collecting plate, and the voltage is 150kV, carry out electrostatic spraying, and the obtained particles are raised from room temperature to 800°C at a rate of 10°C / min under the protection of nitrogen, and the temperature is constant After 6 hours, it was naturally cooled to room temperature to obtain silicon-carbon composite particles.

[0034] Characterization of Silicon Carbon Composite Particles:

[0035] The particle size and particle size distribution of the silicon-carbon composite ...

Embodiment 2

[0040] Example 2. Preparation of silicon-carbon composite particles and its electrochemical performance test

[0041] Mix by mass ratio of chitosan (weight average molecular weight is 89000): silicon powder=20: 0.1, take water as solvent, stir at room temperature more than 24h, the mass concentration sum that obtains chitosan and silicon powder is 5% The solution. Inject the polymer solution into the syringe of the electrostatic jet device, the nozzle is 20cm away from the collecting plate, the high voltage is 150kV, and the electrostatic spray is carried out. After 6 hours, the temperature was lowered to room temperature at a rate of 10°C / min to obtain silicon-carbon composite particles.

[0042] The positive electrode, negative electrode, electrolyte and battery assembly of the simulated battery are the same as in Example 1. The composition of the obtained silicon-carbon composite particles and the test results in the simulated battery are listed in Table 1.

Embodiment 3

[0043] Example 3, Preparation of Silicon Carbon Composite Particles and Testing of Their Electrochemical Properties

[0044] Mix by sodium carboxymethyl cellulose (weight average molecular weight is 250000): the ratio (mass ratio) of silicon monoxide=1: 0.1, take water as solvent, stir at room temperature more than 24h, obtain sodium carboxymethyl cellulose and The sum of the mass concentrations of silicon monoxide is 50% solution. Inject the polymer solution into the syringe of the electrostatic jet device, the nozzle is 20cm away from the collecting plate, the high voltage is 150kV, and the electrostatic spray is carried out. After 6 hours, it was naturally cooled to room temperature to obtain silicon-carbon composite particles.

[0045] The positive electrode, negative electrode, electrolyte and battery assembly of the simulated battery are the same as in Example 1. The composition of the obtained silicon-carbon composite particles and the test results in the simulated bat...

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Abstract

The invention discloses a method for preparing silicon carbide composite particles and application thereof as a cathode material of a lithium ion battery. The method for preparing silicon carbide composite particles comprises the following steps: 1) performing electrostatic spraying on solution containing a silicon source and a carbon source so as to obtain spherical particles, wherein the carbon source is a carbon-containing high-molecular polymer; and 2) sintering the spherical particles in a non-oxidizing atmosphere to obtain the silicon carbide particles. The method enables one-step forming without needing a template and has high practicality; and moreover, the obtained silicon carbide composite particle integrates the advantages of the silicon carbide composite material with the advantages of a porous material, and improves the problems of weak cyclicity and low coulombic efficiency of using silicon-based material as the cathode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a preparation method of silicon-carbon composite particles and its application as a lithium ion battery negative electrode material. Background technique [0002] Lithium-ion batteries are ideal for portable electronic devices such as mobile phones and notebook computers because of their outstanding advantages such as high working voltage, high specific energy, large capacity, small self-discharge, good cycle performance, long service life, light weight, and small size. power supply. In order to meet the requirements of use, high-capacity and long-life lithium-ion batteries have become an important research direction for the development of lithium-ion batteries. Since the specific capacity of the positive electrode material is relatively low, there is not much room for capacity improvement, so the development of high-capacity lithium-ion batteries is mainly concentrated on the negative electrode material. The existing commerc...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/38
CPCY02E60/122Y02E60/10
Inventor 郭玉国殷雅侠万立骏
Owner BEIJING IAMETAL NEW ENERGY TECH CO LTD
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