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Lithium ion battery cathode material and manufacturing method thereof and lithium ion battery

A lithium ion battery and a manufacturing method technology are applied in the field of lithium ion battery negative electrode materials and the manufacturing thereof, which can solve the problems of limited volume effect, difficult capacity maintenance and the like, achieve a simple manufacturing method, eliminate shell pulverization and fall off, and achieve good cycle performance Effect

Inactive Publication Date: 2011-10-05
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above two anode materials, carbon and silicon are simply physically composited or carbon is tightly coated with silicon, which is very limited in alleviating the volume effect during charging and discharging. When the volume of the anode material expands, the electroactive material will pulverize and fall off. still serious
Therefore, after dozens of cycles of general silicon-based negative electrode materials, it is difficult to maintain a capacity above 200mAh / g.

Method used

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  • Lithium ion battery cathode material and manufacturing method thereof and lithium ion battery
  • Lithium ion battery cathode material and manufacturing method thereof and lithium ion battery
  • Lithium ion battery cathode material and manufacturing method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] a. Obtain the central particle. In this embodiment, silicon powder is used as the central particle, and the particle size of the silicon powder is 0.05 μm.

[0109] b. Making a carbon coating layer on the surface of the silicon powder to form a carbon-coated silicon composite material.

[0110] Weigh 0.2 g of phenolic resin and dissolve it in 30 mL of ethanol, add 4 g of silicon powder, and ultrasonically disperse for 100 min; then stir, evaporate, and dry to obtain a viscous compound; transfer it to a porcelain boat, and heat it up to 1200 °C under nitrogen protection ℃, and keep it warm for 0.1 hour, take it out after cooling, and obtain a carbon-coated silicon composite material.

[0111] c. Add the composite material of carbon-coated silicon to 100mL of the mixed solution of hydrofluoric acid and hydrogen peroxide, wherein the mass fraction of hydrofluoric acid is 3%, and the mass fraction of hydrogen peroxide is 1%, and continuously stir for 100h; then the obtained...

Embodiment 2

[0113] a. Obtain the central particle. In this embodiment, silicon powder is used as the central particle, and the particle size of the silicon powder is 0.5 μm.

[0114] b. Making a carbon coating layer on the surface of the silicon powder to form a carbon-coated silicon composite material.

[0115] Weigh 0.2g of styrene-butadiene rubber emulsion and dissolve it in 30mL of ethanol, add 2g of silicon powder, and ultrasonically disperse for 80 minutes; then stir, evaporate, and dry to obtain a viscous compound; transfer it to a porcelain boat, and heat up under nitrogen protection to 1000° C., and keep it warm for 5 hours, take it out after cooling, and obtain a composite material of carbon-coated silicon.

[0116] c. Add the composite material of carbon-coated silicon to 50mL of the mixed solution of hydrofluoric acid and hydrogen peroxide, wherein the mass fraction of hydrofluoric acid is 5%, and the mass fraction of hydrogen peroxide is 3%, and continuously stir for 10h; the...

Embodiment 3

[0118] a. Obtain the central particle. In this embodiment, silicon powder is used as the central particle, and the particle size of the silicon powder is 1 μm.

[0119] b. Making a carbon coating layer on the surface of the silicon powder to form a carbon-coated silicon composite material.

[0120] Weigh 0.3 g of methacrylic acid and dissolve it in 40 mL of ethanol, add 0.2 g of silicon powder, and disperse it ultrasonically for 20 minutes; then stir, evaporate, and dry to obtain a viscous compound; transfer it to a porcelain boat, and heat it up to 700°C, and keep it warm for 1 hour, take it out after cooling, and obtain a carbon-coated silicon composite material.

[0121] c. Add the composite material of carbon-coated silicon to 100mL of the mixed solution of hydrofluoric acid and hydrogen peroxide, wherein the mass fraction of hydrofluoric acid is 15%, and the mass fraction of hydrogen peroxide is 10%, and continuously stir for 5h; then the obtained suspension filtering, f...

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Abstract

The invention provides a lithium ion battery cathode material and a manufacturing method thereof and a lithium ion battery. The lithium ion battery cathode material comprises central particles and shells for coating the central particles, wherein the outside diameter of the central particles is smaller than the inside diameter of the shells. Because the outside diameter of the central particles is smaller than the inside diameter of the shells and the central particles are limited in the shells in the lithium ion battery cathode material, pulverization fall of the central particles can be relieved and even eliminated, the capacity attenuation of the lithium ion battery can be relieved, and the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery negative electrode material, a manufacturing method thereof, and a lithium-ion battery. Background technique [0002] As a rechargeable battery, lithium-ion batteries work by intercalating or deintercalating lithium ions between the positive and negative electrodes. Lithium-ion batteries are widely used in portable electronic devices because they can be reused. [0003] At present, lithium-ion batteries use graphitized carbon as the negative electrode and lithium-containing compounds as the positive electrode. The layered structure of the graphitized carbon negative electrode material provides a place for lithium storage, but its theoretical specific capacity is about 372mAh / g, therefore, the lithium storage capacity of graphitized carbon is low, and it is difficult to meet the large capacity and high power requirements of lithium ion batteri...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/134H01M4/1395H01M10/0525
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 朱广燕曾绍忠陈效华
Owner CHERY AUTOMOBILE CO LTD