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Silicon monoxide composite cathode material for lithium ion battery, and preparation method thereof

A lithium-ion battery, silicon oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of limited preparation methods, waste of resources, and high cost of nano-silicon powder

Active Publication Date: 2012-01-04
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the above methods directly use the active material nano-silicon powder as raw material to prepare silicon composite negative electrode materials. The cost of nano-silicon powder is high, and nano-materials are easy to agglomerate. After several cycles, the agglomeration of active materials still cannot fundamentally solve the material cycle. Stability issues; some use silicon powder and organic matter to be dispersed in an organic solvent, evaporated to dryness by heating, and then sintered at a high temperature to obtain a silicon composite material with a core-shell structure, evaporating the organic solvent, and wasting resources
Although these have improved its cycle stability to a certain extent, they have not fundamentally solved the problem. After many charge-discharge cycles, the specific capacity begins to decay rapidly.
Moreover, the preparation method is limited to the laboratory, and it is difficult to achieve large-scale production

Method used

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  • Silicon monoxide composite cathode material for lithium ion battery, and preparation method thereof
  • Silicon monoxide composite cathode material for lithium ion battery, and preparation method thereof
  • Silicon monoxide composite cathode material for lithium ion battery, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Silicon oxide was sintered at high temperature under an inert atmosphere, and the temperature was raised to 900°C at a rate of 3°C / min, and then kept for 4 hours, and then cooled down to room temperature naturally. Accurately weigh 2g of silicon oxide, 0.6g of graphite, and 1.4g of expanded graphite, add them to a planetary ball mill, evacuate into a vacuum or in an inert atmosphere, ball mill at a speed of 400 r / min for 5 hours, and mix evenly to obtain a silicon oxide composite Negative material.

[0020] Mix the composite material, conductive agent acetylene black, and binder PVDF (polyvinylidene fluoride) according to the mass ratio of 8:1:1, and use NMP (1-methyl-2-pyrrolidone) to prepare the mixture into a slurry. Coat evenly on copper foil, put it in an oven, dry at 80-120°C for 1 hour, take it out and punch it into a pole piece, dry it in vacuum at 85°C for 12 hours, press it, and dry it in vacuum at 85°C for 12 hours to prepare the test battery pole piece. Wi...

Embodiment 2

[0022] Silicon oxide is sintered at high temperature under an inert atmosphere, and the temperature is raised to 1000°C at a rate of 5°C / min, and then kept for 4 hours, and then naturally cooled to room temperature. Accurately weigh 0.9g of silicon oxide and 2.1g of carbon black, add them to a planetary ball mill, evacuate into a vacuum or in an inert atmosphere, ball mill at a speed of 500 r / min for 4.5 hours, and mix evenly to obtain a silicon oxide composite negative electrode material . The test method of the assembled battery is the same as that in Example 1, and the first discharge specific capacity is measured to be 745.95mAh / g, which remains at 430mAh / g after 100 cycles.

Embodiment 3

[0024] The silicon oxide was sintered at high temperature under an inert atmosphere, and the temperature was raised to 800°C at a rate of 3°C / min, and then kept for 5 hours, and then cooled down to room temperature naturally. Accurately weigh 2g of silicon oxide and 1g of expanded graphite, add them to a planetary ball mill, evacuate into a vacuum or in an inert atmosphere, ball mill at a speed of 400 r / min for 6 hours, and mix evenly to obtain a silicon oxide composite negative electrode material. The test method of the assembled battery is the same as that of Example 1, and the first discharge specific capacity is measured to be 1215.284mAh / g, which remains at 542mAh / g after 100 cycles.

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Abstract

The invention discloses a silicon monoxide composite cathode material for a lithium ion battery, and a preparation method thereof. The method comprises steps that: (1) silicon monoxide is sintered under a high temperature in an inert atmosphere, such that nano-sized silicon particles and amorphous silicon dioxide are produced; (2) a certain amount of sintered silicon monoxide and a certain amount of a conductive agent are accurately weighed, the materials are added into a planetary ball mill, and composite ball-milling is carried out upon the materials, such that the silicon monoxide composite cathode material is obtained, wherein silicon monoxide takes 30% to 90% of a total mass of the silicon monoxide composite cathode material. The silicon monoxide composite cathode material provided by the invention has advantages of high capacity, good cycling performance, and good conductivity. The preparation method has advantages of low raw material cost, simple preparation technology, and suitability for industrialized productions.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery composite negative electrode material, in particular to a lithium ion battery high-capacity, good cycle stability silicon oxide composite negative electrode material and a preparation method thereof. Background technique [0002] From the micro-battery required by small electronic devices to the power source of large electric vehicles, lithium-ion batteries are being used more and more widely, and have become a new type of chemical power source with great development potential in the 21st century. At present, most commercial lithium-ion batteries use the lithium cobaltate / graphite system. Due to the low theoretical lithium storage capacity limit of the electrode itself (such as the theoretical specific capacity of graphite is 372mAh / g), it is already possible to improve battery performance by improving the battery prepa...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 刘三兵朱广燕
Owner CHERY AUTOMOBILE CO LTD
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