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A kind of silicon alloy composite negative electrode material, preparation method and lithium ion battery

A negative electrode material, silicon alloy technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor material consistency, low capacity and low first efficiency

Active Publication Date: 2018-03-13
DINGYUAN NEW ENERGY TECH CO LTD
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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 alloy anode materials are generally low, and the consistency of the prepared materials is poor.

Method used

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  • A kind of silicon alloy composite negative electrode material, preparation method and lithium ion battery
  • A kind of silicon alloy composite negative electrode material, preparation method and lithium ion battery
  • A kind of silicon alloy composite negative electrode material, preparation method and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] (1) Mix Fe powder with a median particle size of 10 μm and silicon powder with a median particle size of 3 μm at a molar ratio of Fe:Si=1:2, mix them, and then place the mixed powder in a stainless steel tank , select the quenched steel ball 5mm, pass into the argon gas. Ball milling was carried out on a planetary ball mill, wherein the rotational speed of the ball mill was 500r / min, the mass ratio of the balls to the mixed powder was 50:1, and the ferrosilicon alloy was obtained after ball milling for 50 hours.

[0073] (2) Proportion the ferrosilicon alloy powder obtained in step (1) and spherical natural graphite with a particle size of 5-20 μm in a mass ratio of 10:80, mix them and place them in mechanical fusion, and adjust the rotating speed to 3000.0r / min , the tool gap width is 0.01cm, the fusion is 1.0h, and the precursor is obtained.

[0074] (3) Proportion the precursor powder obtained in step (2) and pitch with a particle size of 5-10 μm (the final cracked ...

Embodiment 2

[0077] (1) Mix Cu powder with a median particle size of 100 μm and silicon powder with a median particle size of 0.05 μm at a molar ratio of Cu:Si=2:1, mix them, and then place the mixed powder in a stainless steel tank , select the quenched steel ball 20mm, pass into the argon to. Ball milling was carried out on a planetary high-energy ball mill, wherein the speed of the ball mill was 1000r / min, the mass ratio of the balls to the powder was 200:1, and the silicon-copper alloy was obtained after ball milling for 40 hours.

[0078] (2) the silicon-copper alloy powder obtained in the step (1) and particle diameter are 5-20 μ m spherical artificial graphite to carry out proportioning by mass ratio 50:10, place in the stainless steel tank after mixing, select hardened steel ball 3mm for use, Bubble argon. Mixing was carried out on a planetary high-energy ball mill, wherein the speed of the ball mill was 100r / min, the mass ratio of the balls to the powder was 10:1, and the ball mi...

Embodiment 3

[0081] (1) 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 are dispersed in an acetone solvent at a molar ratio of Ti-Si:Si=2:1, and then Put the slurry into a sand mill for ball milling, wherein the balls are 0.1mm zirconium balls, the speed of the ball mill is 1500r / min, the mass ratio of the balls to the powder is 10:1, and after 5 hours of ball milling, silicon-titanium alloy slurry is obtained .

[0082](2) Mix the silicon-titanium alloy slurry obtained in step (1) with spherical natural graphite with a particle size of 5-20 μm in a mass ratio of 20:50, and then spray dry to obtain a precursor.

[0083] (3) Place the precursor powder obtained in step (2) in a rotary furnace, adjust the rotation speed to 0.5r / min, feed nitrogen gas, raise the temperature to 800°C at a heating rate of 10.0°C / min, and then feed acetylene gas , control the acetylene gas flow rate to 1.0L / min, keep warm for 2h...

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Abstract

The invention discloses a silicon alloy composite anode material and a preparation method thereof as well as a lithium ion battery employing the anode material. An inner core of the anode material comprises graphite and silicon alloy applied to the surface of the graphite, and a shell is a pyrolytic carbon layer. The silicon alloy anode material with a core-shell structure is prepared in combination with nanocomposite, surface modification and coating modification technologies. The silicon alloy composite anode material is high in compaction density, good in processing performance, high in conductivity, high in first efficiency (more than 90%) and excellent in cyclic stability (400-time cyclic capacity retention rate is more than 92%); the preparation process of the anode material provided by the invention is simple, environment-friendly and pollution-free, and raw materials are low in cost.

Description

technical field [0001] The invention belongs to the field of negative electrode materials of lithium ion batteries, and in particular relates to a silicon alloy composite negative electrode material, 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 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 o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 何鹏李胜岳敏胡亮任建国
Owner DINGYUAN NEW ENERGY TECH CO LTD
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