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A kind of preparation method of carbon nanotube doped tin oxide negative electrode material for lithium ion battery

A lithium-ion battery, carbon nanotube technology, applied in battery electrodes, secondary batteries, electrochemical generators, etc., can solve the problems of high cost, poor cycle performance, serious environmental pollution, etc., and achieve controllable cost and specific capacity. Effects of reduced attenuation and lower heat treatment temperature

Active Publication Date: 2015-10-07
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of the above-mentioned existing tin oxide negative electrode materials such as high cost, poor cycle performance, and serious environmental pollution, the present invention provides a carbon nanotube doped carbon nanotube with uniform microstructure, excellent electrical conductivity and cycle performance, which can be used in lithium batteries. Tin oxide negative electrode material and preparation method thereof

Method used

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  • A kind of preparation method of carbon nanotube doped tin oxide negative electrode material for lithium ion battery
  • A kind of preparation method of carbon nanotube doped tin oxide negative electrode material for lithium ion battery
  • A kind of preparation method of carbon nanotube doped tin oxide negative electrode material for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Copper strip was chosen as the electroplating substrate.

[0056] 1. Copper strip pretreatment

[0057]

[0058] The activation formula and temperature used when preparing the activation solution are:

[0059] Sulfuric acid 40g / L;

[0060] Activation temperature Room temperature.

[0061] Add the pretreatment solution into the pretreatment tank of the continuous electroplating apparatus in sequence, and heat it to the specified temperature.

[0062] 2. Preparation of composite electroplating solution and anodizing solution

[0063] The formula and conditions used when preparing the composite tin plating solution are:

[0064]

[0065] The oxidation formula and conditions used when preparing the anodic oxidation solution are:

[0066]

[0067] 3. After preparing the plating solution, add it to the electroplating tank, and use constant current electroplating in an ultrasonic environment.

[0068] 4. Place the copper strip on the continuous electroplating eq...

Embodiment 2

[0072] Preparation method: select the same copper strip as in Example 1, electroplate a layer of carbon nanotube doped metal tin layer with the thickness of the material electroplated in Example 1 in the same electroplating tin solution as Example 1, through and implement The same anodic oxidation in Example 1 was directly used as the negative electrode material of the lithium ion battery without heat treatment.

Embodiment 3

[0074] Preparation method: take the copper strip, electroplate a layer of carbon nanotube-doped metal tin layer with the same thickness as the material electroplated in Example 1 in the same electroplating tin solution as in Example 1, and then adopt and implement without anodic oxidation The same heat treatment temperature and heat treatment time as Example 1 were annealed to obtain the lithium ion battery negative electrode material.

[0075] Performance Testing

[0076] A sample was prepared as a comparative example in the following manner.

[0077] Purchase natural flake graphite, mix graphite, PVDF and acetylene black evenly according to the mass ratio of 8:1:1, add a certain amount of NMP, stir to make a slurry with appropriate viscosity, and use the scraper method to evenly attach the slurry to the surface of the copper foil. Make a negative electrode sheet.

[0078] The lithium-ion battery anode materials prepared in Example 1, Example 2, Example 3 and Comparative Ex...

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Abstract

The invention discloses a CNTs (carbon nanotubes)-doped tin oxide negative electrode material for a lithium-ion battery and a preparation method thereof. The preparation method comprises the following steps: firstly, compositely electroplating a CNTs-doped tin plating layer with the thickness of 10-15 microns on one side of the surface of a substrate of a pretreated copper strip; and secondly, anodizing the material obtained in the first step to obtain a mesoporous oxide, and performing heat treatment to finally obtain the lithium-ion battery negative electrode material with CNTs-uniformly-doped mesoporous tin oxide layer on one side of the surface of the substrate of the copper strip. The mesoporous diameter is 3-10nm and the obtained oxide layer has the thickness of 5-10 microns. The first specific discharge capacity of the lithium-ion battery negative electrode material can be as high as 650mAh / g, and after 50 cycles, the specific capacity is attenuated by only 0.8%-5%. The preparation method is simple in process, and large-scale industrial production can be carried out.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a carbon nanotube-doped tin oxide negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high power density, good safety performance, long cycle life, etc., and do not contain lead, cadmium, mercury and other pollutants, so they are an ideal energy storage device. As one of the core components of lithium-ion batteries, anode materials have an important impact on improving the capacity and cycle life of lithium-ion batteries, and have received great attention from academia and industry. The anode material that has been industrially produced is a carbon material, and its theoretical specific capacity is 372mAh / g. At present, the practically used carbon anode capacity is very close to its theoretical specific capacity, and it is unlikely to further increase the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/1391
CPCH01M4/48H01M4/625H01M4/663H01M10/0525Y02E60/10
Inventor 马增胜潘勇曾维瑶周益春朱岭雷维新杨阳阳
Owner XIANGTAN UNIV
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