Sn-Co/C alloy cathode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and alloy negative electrodes, applied in the field of electrochemistry, can solve problems such as unfavorable environmental protection, atmospheric pollution, and difficult reduction by thermal carbon reduction, and achieve the effects of convenient operation, prevention of pulverization, and increase of electrode capacity.

Inactive Publication Date: 2014-12-10
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent application 200710176459.7 discloses a preparation method of a tin-cobalt-carbon composite negative electrode material for a lithium ion battery. The application uses a carbothermal reduction method, using tin and cobalt compounds as raw materials, and using excess carbon powder to reduce the formed tin-cobalt alloy to prepare tin Cobalt-carbon composite negative electrode material, but a large amount of CO is produced during the preparation process, which is easy to cause air pollution and is not conducive to environmental protection. At the same time, thermal carbon reduction is difficult to restore completely and introduces other by-product impurities

Method used

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  • Sn-Co/C alloy cathode material of lithium ion battery and preparation method thereof
  • Sn-Co/C alloy cathode material of lithium ion battery and preparation method thereof
  • Sn-Co/C alloy cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0051](1) Mix 5.94g of 10μm Sn powder and 0.06g of Co powder evenly, put it into a melting furnace (Guangdong Hengyang Electric Furnace Manufacturing Co., Ltd., GW-30T; the same below.) and vacuumize, melt at 700°C for 1.5h and then transfer Enter the spray tower (Keyi Split Materials Co., Ltd., Gedian Development Zone, Hubei Province, one-way throwing centrifugal spray powder mill; the same below.) for centrifugal spraying, the centrifugal speed is 2000r / min, and finally cool at the discharge port Collect and cool at 53°C to obtain a Sn-Co composite material;

[0052] (2) Add 6g of the Sn-Co composite material in step (1) into 66.6ml, 1mol / L nitric acid solution for acid treatment for 5 hours to obtain the acid-treated Sn-Co material;

[0053] (3) Pour 9.3g of citric acid into 30ml of absolute ethanol for full dissolution, then add 4.2g of the Sn-Co material in step (2), stir evenly, dry in a blast oven at 60°C for 2 hours, then vacuum dry at 50°C 24h, obtain dry material A;...

Embodiment example 2

[0060] (1) Mix 5.88g of 20μm Sn powder and 0.12g of Co powder evenly, put it into the melting furnace and vacuumize it, melt it at 1000℃ for 0.5h, then transfer it to the spray tower for centrifugal spraying, the centrifugal speed is 1000r / min, and finally The feed port is cooled and collected, and the cooling temperature is 10°C to obtain the Sn-Co composite material;

[0061] (2) Add 6g of the Sn-Co composite material in step (1) into 33.3ml, 2mol / L nitric acid solution for acid treatment for 3 hours to obtain the acid-treated Sn-Co material;

[0062] (3) Pour 14.82g of citric acid into 30ml of absolute ethanol for full dissolution, then add 4.2g of the Sn-Co material in step (2), stir evenly, dry in a blast oven at 60°C for 2 hours, then vacuum dry at 90°C 10h, obtain dry material A;

[0063] (4) Place the dried material A in step (3) in a tube furnace, raise the temperature at 2°C / min under the protection of nitrogen, and sinter at 400°C for 5 hours to complete a carbon c...

Embodiment example 3

[0068] (1) Mix 5.88g of 100μm Sn powder and 0.12g of Co powder evenly, put it into the melting furnace and vacuumize it, melt it at 800°C for 2 hours, then transfer it to the spray tower for centrifugal spraying, the centrifugal speed is 2000r / min, and finally discharge The mouth is cooled and collected, and the cooling temperature is 100 ° C to obtain a Sn-Co composite material;

[0069] (2) Add 6g of the Sn-Co composite material in step (1) into 22.2ml, 3mol / L hydrochloric acid solution for acid treatment for 2 hours to obtain the acid-treated Sn-Co material;

[0070] (3) Pour 9.3g of citric acid into 30ml of absolute ethanol for full dissolution, then add 4.2g of the Sn-Co material in step (2), stir evenly, dry in a blast oven at 60°C for 2 hours, and then vacuum dry at 60°C 20h, obtain dry material A;

[0071] (4) Place the dried material A in step (3) in a tube furnace, heat up at 4°C / min under the protection of nitrogen, and sinter at 400°C for 5h to complete a carbon c...

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Abstract

The invention discloses a Sn-Co / C alloy cathode material of a lithium ion battery and a preparation method thereof. The preparation method comprises the steps: uniformly mixing Sn powder and Co powder according to the mass ratio of (99:1) to (97:3), melting the mixture of the Sn powder and the Co powder, and carrying out spraying cooling to obtain a Sn-Co composite material; then adding an acid solution with the concentration being 1-3mol / L into a Sn-Co composite material for acid treatment to obtain a Sn-Co material subjected to the acid treatment; and mixing and sintering the Sn-Co material with an organic carbon source and asphalt in sequence to obtain an Sn-Co / C alloy cathode material. According to the invention, by adoption of acid etching, primary carbon coating based on the organic carbon source and secondary carbon coating based on the asphalt, the electrode is limited in expansion while being endowed with an expansion space, so that the material is prevented from being pulverized in a discharge / charge process. The prepared Sn-Co / C alloy cathode material is a solid solution alloy, has excellent mechanical strength, is free from the problem of electrode capacity reduction caused by the material itself, is improved in cyclic performance and electrode capacity at the same time, and has the advantages of high charge / discharge capacity and good cyclic performance.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a Sn-Co / C alloy negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have attracted much attention due to their advantages such as high voltage, high specific energy, wide operating temperature range, environmental friendliness, and no memory effect, and have been used in various portable electronic products such as mobile phones, digital cameras, notebook computers, and power tools and other fields, and gradually become one of the energy supplies for hybrid and pure electric vehicles in the future. The progress of batteries depends largely on the progress of new electrode materials. At present, the negative electrode materials of lithium-ion batteries are basically graphite and various carbon materials. Although commercial graphite-based carbon anode materials have good c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/1395H01M4/134
CPCY02E60/122Y02E60/10
Inventor 侯贤华成志博胡社军岳敏贺雪琴
Owner SOUTH CHINA NORMAL UNIVERSITY
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