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A kind of negative electrode material of lithium ion battery and preparation method thereof

A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low ion transfer rate, poor conductivity, material breakage and falling off, etc., to improve cycle stability, reduce vacancy formation energy, Effect of large internal cavity

Active Publication Date: 2021-07-13
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a lithium ion battery negative electrode material and a preparation method thereof for the existing metal sulfide materials as lithium battery negative electrode materials, such as poor conductivity, low ion transfer rate, material fragmentation and falling off, etc. Using high-vacancy nitrogen-doped zinc sulfide nanotubes as the negative electrode active material, it has high specific capacity

Method used

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  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof
  • A kind of negative electrode material of lithium ion battery and preparation method thereof

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Embodiment 1

[0034] In the negative electrode material of the lithium ion battery, the negative electrode active material is nitrogen-doped zinc sulfide nanotube. The nitrogen doped

[0035] The heterozinc sulfide nanotubes utilize ammonia gas as a nitrogen source.

[0036] The preparation method of described lithium-ion battery negative electrode material, comprises the following steps:

[0037] (1) Preparation of zinc sulfide nanotubes:

[0038] Take 150mL of deionized water, add 1.5g of zinc chloride and 1.5g of hexamethylenetetramine and stir evenly, heat in a water bath at 80°C for 8 hours, then add 8g of sodium sulfide and 0.8mL of thioglycolic acid, stir evenly, and again Heat in a water bath at 80°C for 8 hours, collect the product by centrifugation, soak in acetic acid solution with a mass fraction of 10% to 30% for 20 minutes, after the reaction is completed, collect the product by centrifugation, wash with deionized water three times, and dry at 60°C for 12 hours ZnS nanotube...

Embodiment 2

[0045] The preparation method of described lithium-ion battery negative electrode material, comprises the following steps:

[0046] (1) Preparation of ZnS nanotubes:

[0047] Take 100mL of deionized water, add 1g of zinc chloride and 1g of hexamethylenetetramine and stir evenly, heat in a water bath at 60°C for 6 hours, then add 5g of sodium sulfide and 0.5mL of thioglycolic acid, stir evenly, and heat again at 60°C Heat in a water bath for 6 hours, collect the product by centrifugation, soak in acetic acid solution with a mass fraction of 10% to 30% for 10 minutes, after the reaction is completed, collect the product by centrifugation, wash with deionized water three times, and dry at 60°C for 12 hours. Zinc sulfide nanotubes were obtained.

[0048] (2) Preparation of high-vacancy nitrogen-doped ZnS nanotubes:

[0049] Take 1 g of zinc sulfide nanotubes prepared in step (1), place them in a tube furnace, and feed nitrogen and ammonia at the same time, wherein the nitrogen g...

Embodiment 3

[0051] The preparation method of described lithium-ion battery negative electrode material, comprises the following steps:

[0052] (1) Preparation of ZnS nanotubes:

[0053] Take 200mL of deionized water, add 2g of zinc chloride and 2g of hexamethylenetetramine and stir evenly, add 10g of sodium sulfide and 1mL of thioglycolic acid in a water bath at 90°C for 12 hours, then add 10g of sodium sulfide and 1mL of thioglycolic acid, stir evenly, and again in a 90°C water bath Heating for 12 hours, collecting the product by centrifugation, soaking in acetic acid solution with a mass fraction of 10% to 30% for 30 minutes, after the reaction is completed, collecting the product by centrifugation, washing with deionized water three times, and drying at 60°C for 12 hours to obtain ZnS nanotubes.

[0054] (2) Preparation of high-vacancy nitrogen-doped ZnS nanotubes:

[0055] Take 2 g of zinc sulfide nanotubes prepared in step (1), place them in a tube furnace, and feed nitrogen and a...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. The negative electrode material uses high-vacancy nitrogen-doped zinc sulfide nanotubes as the negative electrode active material, and has high specific capacity. The preparation method prepares nitrogen-doped zinc sulfide nanotubes by a hydrothermal method, and then enhances surface defect sites by water vapor etching, thereby obtaining electrode materials with higher charge-discharge specific capacity and better cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery negative electrode material and a preparation method thereof. Background technique [0002] Today's electric vehicles, portable electronic devices, and large power grids demand the energy density of lithium batteries [0003] Beyond the technical level of existing lithium-ion batteries, in order to further research and develop high-performance lithium-ion batteries, it is particularly critical to manufacture electrode materials with high capacity, long life, and high rate performance. At present, most of the anode materials of commercial lithium-ion batteries are graphite, but its theoretical specific capacity is only 372mAh / g. After nearly 20 years of development, its actual energy density is close to its theoretical capacity, and the probability of increasing the capacity of graphite electrodes is very small. , unable to meet the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62
CPCH01M4/364H01M4/38H01M4/5815H01M4/624Y02E60/10
Inventor 张永光王加义
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
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