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Preparation method of SnOx/carbon nano-tube composite material for lithium ion battery

A lithium-ion battery, carbon nanotube technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of capacity decay, large size of tin-based materials, etc., and achieve low cost, controllable material structure, and excellent electrochemical performance. performance effect

Active Publication Date: 2015-09-30
XI AN JIAOTONG UNIV
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  • Description
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Problems solved by technology

And the first inventor of this patent also successfully prepared SnO with nanostructure units 2 and SnO hierarchical structure, Sn(II) doped or SnO co-doped with Ti(IV) 2 The flower-like or linear hierarchical structure assembled by nanosheets was discovered by constructing a three-dimensional hierarchical structure or doping modified SnO 2 Nanomaterials can improve their electrochemical performance to a certain extent, but their capacity decays rapidly with the increase of cycle times.
The reason is that the size of the prepared tin-based material is still very large (tens or even hundreds of nanometers), and the volume expansion caused by Li-Sn alloying is as high as 300%.

Method used

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  • Preparation method of SnOx/carbon nano-tube composite material for lithium ion battery
  • Preparation method of SnOx/carbon nano-tube composite material for lithium ion battery

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preparation example Construction

[0022] The invention provides a kind of SnO for lithium ion battery x / The preparation method of carbon nanotube composite material, take tin-based organometallic compound as tin source, mix carbon nanotube and tin source evenly, heat and evaporate until viscous mixture is obtained, the viscous mixture obtained is heat-treated and sintered to obtain SnO x , Carbon nanotube composites.

[0023] The specific technical scheme is as follows:

[0024] 1), first mix the carbon nanotubes and the tin source uniformly to obtain mixture 1; the method for uniformly mixing the carbon nanotubes and the tin source specifically includes: directly mix the tin source and the carbon nanotubes at a mass ratio of 10:1 to 1:1, and Mix evenly by grinding and ball milling.

[0025] 2), heating the mixture 1 in the range of 60-150°C to obtain a viscous product;

[0026] 3) heat-treat the viscous product obtained above at 350-650°C for 1-5h to obtain mixture 2;

[0027] 4), naturally cool the mixt...

Embodiment 1

[0039] Disperse 20mg of multi-walled carbon nanotubes in 5ml of isopropanol, then add 200mg of stannous octoate, stir to mix evenly, and dry at about 100°C, then sinter in a muffle furnace at 350°C for 1 hour in an air atmosphere. Cool naturally to room temperature to get SnO 2 - Multi-walled carbon nanotube composites. with SnO 2 - Carbon nanotube composite material is used as the negative electrode material, mixed with acetylene black and polyacrylic acid (PAA) at a mass ratio of 8:1:1, prepared by adding water to a uniform slurry, coated on copper foil, and dried at 120°C for more than 12 hours , wherein the amount of active material is above 1mg (diameter of the electrode disc is 14mm). The lithium sheet is used as the counter electrode, the American celgard2400 is used as the lithium battery separator, and the electrolyte is 1MLiPF 6 , the solvent is EC+DEC (volume ratio 1:1), assembled into a 2025 button battery. The battery charge and discharge test is carried out o...

Embodiment 2

[0041] Disperse 20mg of multi-walled carbon nanotubes in 5ml of isopropanol, then add 200mg of stannous octoate, stir to make it evenly mixed, and dry it at about 100°C, then transfer it to a tube furnace, and at the same time under the protection of nitrogen at 450 Sintering at ℃ for 1h. Cool naturally to room temperature to get SnO-SnO 2 - Multi-walled carbon nanotube composites. Part of the generated SnO can be removed by dissolving with hydrochloric acid. In the present invention, SnO is not further processed, and the tin oxide-carbon nanotube composite material is directly used as the negative electrode material, mixed with acetylene black and polyacrylic acid (PAA) in a mass ratio of 8:1:1, and water is added to prepare a uniform slurry. Coated on copper foil and dried at 120°C for more than 12 hours, wherein the amount of active material is 0.2-1mg (diameter of electrode disc is 14mm). The lithium sheet is used as the counter electrode, the American celgard2400 is us...

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Abstract

The invention discloses a preparation method of a SnOx / carbon nano-tube composite material for a lithium ion battery. The preparation method comprises the following steps: by taking organic metal stannous compound such as stannous octoate as a tin source and taking organic solvent such as isopropanol as a dispersing agent of the tin source and a carbon nanotube, uniformly mixing the tin source and carbon nanotube in an ultrasonic stirring manner, removing the solvent in an evaporating way, thereby obtaining a viscose mixture; or directly uniformly mixing oily stannous octoate and carbon nanotube in a way such as grinding / ball milling, further carrying out heat treatment under nitrogen or air, regulating the temperature and atmosphere, thereby obtaining the SnOx / carbon nanotube composite material. The prepared lithium ion battery composite electrode material is simple in preparation method, low in cost, controllable in material structure and excellent in electrochemical performance.

Description

technical field [0001] The invention belongs to the field of preparation and application of lithium ion battery electrode materials, in particular to a kind of SnO x / Preparation method of carbon nanotube composite material. Background technique [0002] As a typical representative of electrochemical energy storage devices, lithium-ion batteries, compared with chemical power sources such as lead-acid and nickel-cadmium, have high specific energy, high specific power, long life, small memory effect and self-discharge, high cost performance and green Environmental protection and other advantages, since entering the market in the early 1990s, quickly became the power supply choice for portable electronic products, promoted the miniaturization of these products, and greatly promoted the information revolution process dominated by the Internet and wireless communications in the past two decades. At present, lithium-ion batteries have become an irreplaceable power source for smar...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62H01M4/131H01M4/133H01M10/0525
CPCH01M4/131H01M4/133H01M4/48H01M4/62H01M10/0525Y02E60/10
Inventor 王红康牛春明李雨东谢冲
Owner XI AN JIAOTONG UNIV
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