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Tin-nickel-carbon alloy composite material for lithium ion battery and preparation method thereof

A technology of lithium-ion batteries and composite materials, which is applied in the field of tin-nickel-carbon alloy composite materials for lithium-ion batteries and its preparation, can solve the problems of powdered electrode performance of electrode materials, poor battery cycle performance, and deterioration, so as to improve the overall capacity , Improve the effect of cycle stability and life

Active Publication Date: 2011-05-11
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large volume change of the alloy negative electrode in the process of lithium intercalation and deintercalation can easily lead to the pulverization of the electrode material and the deterioration of the electrode performance, and the cycle performance of the battery is poor.

Method used

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  • Tin-nickel-carbon alloy composite material for lithium ion battery and preparation method thereof
  • Tin-nickel-carbon alloy composite material for lithium ion battery and preparation method thereof
  • Tin-nickel-carbon alloy composite material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0047] The tin-nickel-carbon alloy composite material for lithium-ion batteries is composed of 15% nickel powder, 20% tin powder, 58% graphite and 7% pitch, and the above percentages are all mass percentages.

[0048] The preparation method of the tin-nickel-carbon alloy composite material for lithium-ion batteries of the present embodiment is as follows:

[0049] (1) First mix 15% tin powder and 20% nickel powder according to the mass ratio and add appropriate amount of alcohol for high-energy mechanical ball milling for 10 hours;

[0050] (2) Then the alloy powder obtained by the above-mentioned mechanical ball milling was mixed with 58% graphite and alcohol was added to continue high-energy mechanical ball milling for 8 hours, and the particle size value of the added graphite was 15 μmm;

[0051] (3) Take out the above-mentioned tin-nickel alloy-carbon composite material to remove alcohol by suction filtration, then put it into an oven for vacuum drying for 8 hours, then ca...

no. 2 approach

[0055] The tin-nickel-carbon alloy composite material for lithium-ion batteries is composed of 20% nickel powder, 25% tin powder, 45% graphite and 10% pitch, and the above percentages are all mass percentages.

[0056] The preparation method of the tin-nickel-carbon alloy composite material for lithium-ion batteries of the present embodiment is as follows:

[0057] (1) First, mix 20% tin powder and 25% nickel powder according to the mass ratio and add an appropriate amount of alcohol for high-energy mechanical ball milling for 12 hours;

[0058](2) Then the alloy powder obtained by above-mentioned mechanical ball milling was mixed with 45% graphite and alcohol was added to continue high-energy mechanical ball milling for 10 hours, and the particle size value of the added graphite was 17 μm;

[0059] (3) Take out the above-mentioned tin-nickel alloy carbon composite material to remove alcohol by suction filtration, then put it into an oven for vacuum drying for 12 hours, then p...

no. 3 approach

[0063] The tin-nickel-carbon alloy composite material for lithium-ion batteries is composed of 25% nickel powder, 30% tin powder, 35% graphite and 10% pitch, and the above percentages are all mass percentages.

[0064] The preparation method of the tin-nickel-carbon alloy composite material for lithium-ion batteries of the present embodiment is as follows:

[0065] (1) First mix 25% tin powder and 30% nickel powder according to the mass ratio and add appropriate amount of alcohol for high-energy mechanical ball milling for 15 hours;

[0066] (2) Then the alloy powder obtained by the above-mentioned mechanical ball milling was mixed with 35% graphite and alcohol was added to continue the high-energy mechanical ball milling for 15 hours, and the particle diameter value of the added graphite was 18 μmm;

[0067] (3) Take out the above-mentioned tin-nickel alloy carbon composite material to remove alcohol by suction filtration, then put it into an oven for vacuum drying for 16 hou...

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Abstract

The invention discloses a tin-nickel-carbon alloy composite material for a lithium ion battery and a preparation method thereof. The method comprises the following steps of: combing tin powder and nickel powder in a mass ratio, adding a proper amount of alcohol, and performing high-energy mechanical ball milling; mixing the alloy powder obtained by the mechanical ball milling and graphite, addingalcohol, and continuously performing high-energy mechanical ball milling mixing; performing suction filtration on the tin-nickel alloy carbon composite material to remove the alcohol, then putting the composite material into an oven, performing vacuum drying, performing high-temperature thermal treatment under the protection of nitrogen, and then naturally cooling to normal temperature; and finally, taking out the prepared tin-nickel-carbon alloy composite material after cooling, adding asphalt, then adding alcohol and continuously performing high-energy mechanical ball milling, taking out the material, performing suction filtration, performing vacuum drying, performing high-temperature thermal treatment under the protection of nitrogen, and naturally cooling to normal temperature after the thermal treatment to obtain the prepared tin-nickel-carbon alloy composite material. The material has high specific discharge capacity, high coulombic efficiency and long cycle life.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to a tin-nickel-carbon alloy composite material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Compared with other secondary batteries, lithium-ion batteries have the advantages of high voltage, high energy density, light weight, and environmental friendliness. At present, they have been widely used in portable electronic products and power tools, and are expected to become the future of hybrid vehicles and pure power vehicles. One of the energy supplies of the car. The negative electrode material is one of the key factors that determine the overall performance of lithium-ion batteries. Although graphite-based carbon negative electrode materials have good cycle performance, due to the low mass specific capacity (theoretical value is 372mAh / g, the actual performance The capacity is 330-360...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/38H01M4/1395B22F1/00C22C30/04C22C1/05
CPCY02E60/10
Inventor 岳敏侯贤华梁奇贺雪琴
Owner BTR NEW MATERIAL GRP CO LTD
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