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Lithium ion battery tin-carbon nanometer tube negative pole material and preparation method thereof

A technology of lithium-ion batteries and carbon nanotubes, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve the problems of large irreversible capacity loss, reduce specific energy, weaken Sn lithium intercalation capacity, etc., and achieve significant practical value And economic benefits, reduce the degree of broken, easy to operate

Inactive Publication Date: 2009-09-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduction of inert materials (such as Li 2 O) reduces the total specific energy, resulting in a large irreversible capacity loss, which weakens the advantage of high lithium intercalation capacity of Sn

Method used

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  • Lithium ion battery tin-carbon nanometer tube negative pole material and preparation method thereof
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  • Lithium ion battery tin-carbon nanometer tube negative pole material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 100ml of concentrated sulfuric acid (concentration: 98%) into about 800ml of deionized water under stirring, stir continuously, add 30g of stannous sulfate while it is hot, stir to make it completely dissolve, after the stannous sulfate is completely dissolved and cooled, add 10ml of additive SS-820 and 0.5ml of SS-821, stir evenly, add 1g of carbon nanotubes, add deionized water to a solution of 1000ml, and finally ultrasonically disperse for 30 minutes. A tin block with a purity of 99.9% is used as the anode, and a 10-micron thick copper foil is used as the cathode. 2 Under the condition of current density and ultrasonic stirring, the constant current electroplating is performed for 25 minutes, and the surface of the composite coating is rinsed with distilled water to obtain a tin-carbon nanotube negative electrode material containing a large amount of carbon nanotube network structure.

Embodiment 2

[0025] The current density in embodiment 1 is controlled to be 0.375A / dm 2 , other preparation processes are the same as in Example 1.

Embodiment 3

[0027] The current density in embodiment 1 is controlled to be 0.5A / dm 2 , other preparation processes are the same as in Example 1.

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Abstract

The invention discloses tin-carbon nanotube negative pole material used for a lithium ion battery and the preparation method thereof; wherein, tin is adopted as active substance, and carbon nanotube of network structure is embedded in the tin layer in a network structure. In the tin-carbon nanotube negative pole material, because a great amount of the carbon nanotube is embedded in the tin coating layer, during the charging and discharging cyclical process of the working electrode made of negative pole material, an embedding and disengaging channel for the lithium ion is provided through the network structure established by the carbon nanotube in the tin active substance; simultaneously, the carbon nanotube plays the strengthening and toughening effect, the breaking degree of the electrode because the volume changing is reduced, and the circulation performance of the electrode is improved. The process of the invention is simple, the operation is simple and convenient, the invention provides conditions for industrial production, and has remarkable practical value and economic benefit.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery tin-carbon nanotube negative electrode material and a preparation method thereof. Background technique [0002] Since the 1990s, lithium-ion batteries have been used as mobile batteries for mobile phones, notebook computers, camcorders, cameras, etc. It can also be used as a power battery for electric vehicles. In order to further improve the performance of lithium-ion batteries, people continue to research and develop tin-based negative electrode materials, aiming to obtain new lithium-ion battery electrode materials with high specific capacity, high stability, high safety and low cost. [0003] In 1997, Yoshio Idota et al. reported an amorphous tin oxide lithium storage material in Science (Science, 1997, 276: 1395-1397), its reversible discharge capacity can reach more than 600mAh / g, and the lithium extraction potential is low , the electrode struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/04B01J19/00
CPCY02E60/10
Inventor 谭春林李伟善李昌明赵灵智
Owner SOUTH CHINA NORMAL UNIVERSITY
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