Preparation method of silicon carbon composite anode material

A negative electrode material, silicon-carbon composite technology, applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor material consistency, low capacity and low first effect, and achieve high compaction density, simple preparation process, The effect of no pollution to the environment

Inactive Publication Date: 2015-09-09
田东
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the capacity and first effect of the existing silicon-carbon anode materials are generally low, and the consistency of the prepared materials is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Fe powder with a median particle size of 10 μm and silicon powder with a median particle size of 3 μm are proportioned according to the weight ratio Fe:Si=1:2, and the total weight of Fe powder and silicon powder: carbon Source precursor=0.1:1 ratio weighs phenolic resin, ball mills for 50 hours until mixed evenly;

[0032] (2) Put the powder obtained in step (1) in a box-type furnace, pass in argon gas, raise the temperature to 1050°C at a heating rate of 10°C / min, keep it warm for 10h, and cool naturally to room temperature;

[0033] (3) Pulverize, sieve and demagnetize the powder obtained in step (2) to obtain a silicon-carbon composite negative electrode material with a particle size D50 of 1.0-10 μm.

Embodiment 2

[0035] (1) Proportion Cu powder with a median particle size of 10 μm and silicon powder with a median particle size of 0.05 μm according to the weight ratio Cu:Si=2:1, and at the same time according to the total weight of Cu powder and silicon powder: carbon Source precursor=0.5:1 ratio takes epoxy resin, ball mills for 40h until mixed evenly;

[0036] (2) Put the powder obtained in step (1) in a box-type furnace, pass in argon gas, raise the temperature to 900°C at a heating rate of 10°C / min, keep it warm for 10h, and cool naturally to room temperature;

[0037] (3) Pulverize, sieve and demagnetize the powder obtained in step (2) to obtain a silicon-carbon composite negative electrode material with a particle size D50 of 1.0-10 μm.

Embodiment 3

[0039] (1) Proportion the silicon-titanium alloy powder with a median particle size of 0.1 μm and the silicon powder with a median particle size of 30 μm according to the weight ratio Ti-Si:Si=2:1, and simultaneously press the silicon-titanium alloy powder Body and silicon powder total weight: the ratio of carbon source precursor = 0.5:1 weighs phenolic resin, disperses in ethanol solvent, and then puts the slurry into a sand mill for ball milling, wherein the balls are 0.1mm zirconium balls, The rotational speed of the ball mill is 1500r / min, the mass ratio of balls and powder is 10:1, and after ball milling for 5 hours, silicon-titanium alloy slurry is obtained;

[0040] (2) Put the powder obtained in step (1) in a box-type furnace, pass in argon gas, raise the temperature to 800°C at a heating rate of 10°C / min, keep it warm for 2h, and naturally cool to room temperature;

[0041] (3) Pulverize, sieve and demagnetize the powder obtained in step (2) to obtain a silicon-carbon...

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Abstract

The invention discloses a preparation method of a silicon carbon composite anode material. According to the anode material, a multiphase composite system is formed through combination of silicon, metal and carbon, the high capacity of the material is guaranteed, and the volume expansion and shrinkage effect in the charge-discharge process can be relieved; silicon and metal are dispersed in a carbon cracking system, metal can improve the conductivity, silicon has a high-capacity characteristic, the cracking carbon provides mechanical support, and accordingly, the material structure is stabilized. The silicon carbon composite anode material has high compaction density, good processing performance, high conductivity, high initial efficiency and excellent cycling stability. The preparation process of the anode material is simple, the cost of raw materials is low, and the anode material is environment-friendly, pollution-free and suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of a silicon-carbon composite 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 human society is facing severe challenges. The development of clean and energy-saving new energy vehicles is highly valued by countries all over the world. The key to the development of new energy vehicles lies in their power sources. Lithium-ion batteries have the advantages of high energy density, small self-discharge, no memory effect, wide operating voltage range, long service life, and no environmental pollution. They are currently the main power source for new energy vehicles. The key electrode material of lithium-ion battery is the final decisive factor of battery performance, and the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/587H01M4/38H01M10/0525
CPCH01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/38H01M4/587H01M10/0525H01M2220/20Y02E60/10
Inventor 田东
Owner 田东
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