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CNTS-doped tin oxide negative electrode material for lithium-ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in the field of CNTs-doped tin oxide negative electrode materials and its preparation, can solve the problems of high cost, serious environmental pollution, poor cycle performance, etc., and achieve cost controllable, low heat treatment temperature, and relatively The effect of capacity fade reduction

Active Publication Date: 2014-01-01
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 high cost, poor cycle performance, and serious environmental pollution of the above-mentioned existing tin oxide negative electrode materials, the present invention provides a CNTs-doped tin oxide with uniform microstructure, excellent electrical conductivity and cycle performance, which can be used in lithium batteries Negative electrode material and preparation method thereof

Method used

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  • CNTS-doped tin oxide negative electrode material for lithium-ion battery and preparation method thereof
  • CNTS-doped tin oxide negative electrode material for lithium-ion battery and preparation method thereof
  • CNTS-doped tin oxide negative electrode material for lithium-ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Copper strip was chosen as the electroplating substrate.

[0053] 1. Copper strip pretreatment

[0054] Degreasing solution:

[0055]

[0056] The activation formula and temperature used when preparing the activation solution are:

[0057] Sulfuric acid 40g / L;

[0058] Activation temperature Room temperature.

[0059] Add the pretreatment solution into the pretreatment tank of the continuous electroplating apparatus in sequence, and heat it to the specified temperature.

[0060] 2. Preparation of composite electroplating solution and anodizing solution

[0061] The formula and conditions used when preparing the composite tin plating solution are:

[0062]

[0063] The oxidation formula and conditions used when preparing the anodic oxidation solution are:

[0064]

[0065] 3. After preparing the plating solution, add it to the electroplating tank, and use constant current electroplating in an ultrasonic environment.

[0066] 4. Place the copper strip on t...

Embodiment 2

[0070] Preparation method: select the same copper strip as in Example 1, electroplate a layer of CNTs-doped metal tin layer with the thickness of the material electroplated in Example 1 in the same electroplating tin solution as Example 1, and pass through the same thickness as Example 1 The same anodic oxidation is not heat-treated, and it can be directly used as the negative electrode material of lithium-ion batteries.

Embodiment 3

[0072] Preparation method: take the copper strip, and electroplate a layer of CNTs-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, without anodic oxidation and then adopt the same method as in Example 1. The same heat treatment temperature and heat treatment time are annealed to obtain the lithium ion battery negative electrode material.

[0073] Performance Testing

[0074] A sample was prepared as a comparative example in the following manner.

[0075] 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.

[0076] The lithium-ion battery anode materials prepared in Example 1, Example 2, Example 3 and Comparative Exam...

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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 CNTs-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 specific cap...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/1391
CPCY02E60/122H01M4/48H01M4/625H01M4/663H01M10/0525Y02E60/10
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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