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Stannic oxide anode material for lithium ion battery and preparation method of material

A technology for lithium ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle performance of tin oxide negative electrode materials, and achieve a simple and easy preparation process, controllable cost, and low production cost. Effect

Active Publication Date: 2013-12-25
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the above-mentioned technical problem of poor cycle performance of the existing tin oxide negative electrode materials, the present invention provides a tin oxide negative electrode material with simple process, excellent cycle performance, which can be used in lithium batteries and its preparation method

Method used

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  • Stannic oxide anode material for lithium ion battery and preparation method of material
  • Stannic oxide anode material for lithium ion battery and preparation method of material
  • Stannic oxide anode material for lithium ion battery and preparation method of material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Copper strip was chosen as the electroplating substrate.

[0044] 1. Pretreatment of copper strip

[0045] Degreasing solution:

[0046]

[0047] The activation formula and temperature used when preparing the activation solution are:

[0048] Sulfuric acid 40g / L;

[0049] Activation temperature Room temperature.

[0050] Add the pretreatment solution into the continuous electroplating pretreatment tank in order and heat it to the specified temperature.

[0051] 2. Preparation of composite electroplating solution and anodizing solution

[0052] The tin plating formula and conditions used when preparing the composite tin plating solution are:

[0053]

[0054] The oxidation formula and conditions used when preparing the anodic oxidation solution are:

[0055]

[0056]

[0057] 3. After preparing the plating solution, add it to the electroplating tank, and use constant current electroplating.

[0058] 4. Place the copper strip on the continuous electropl...

Embodiment 2

[0062] Preparation method: select the same copper strip as in Example 1, electroplate a layer of metal tin layer with the thickness of the electroplated material in Example 1 in the same electroplating tin solution as Example 1, through the same process as in Example 1 After anodic oxidation, it is directly used as the negative electrode material of lithium-ion batteries without heat treatment.

Embodiment 3

[0064] Preparation method: take the copper strip, and electroplate a layer of metal tin layer with the same thickness as the electroplated material in Example 1 in the same electroplating tin solution as in Example 1, without anodic oxidation, and then adopt the same heat treatment temperature as in Example 1 and heat treatment time, annealed to obtain lithium ion battery negative electrode material.

[0065] Performance Testing

[0066] A sample was prepared as a comparative example in the following manner.

[0067] 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.

[0068] The lithium-ion battery anode materials prepared in Example 1, Example 2, Example 3 and Comparative Example were assembled into button bat...

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Abstract

The invention discloses a stannic oxide anode material for lithium ion battery and a preparation method of the material. A pretreated copper strip substrate is electroplated with a metallic tin coating with a thickness of 10-15 mu m on the surface, then the obtained material is subjected to anodic oxidation treatment for obtaining a mesoporous oxide, then the mesoporous oxide is subjected to heat treatment, and finally the lithium ion battery anode material, which comprises the copper strip substrate with the surface accompanied with the mesoporous tin oxide layer, is prepared, wherein the mesoporous diameter is 3-10 nm and the thickness of the oxide layer is 5-10 mu m. The prepared lithium ion battery anode material has maximum initial discharge specific capacity of 600 mAh / g, and the initial discharge specific capacity is two times of that of conventional carbon materials. The preparation method is simple, and the prepared stannic oxide based anode material has good performances.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a 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 capacity of th...

Claims

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Application Information

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IPC IPC(8): H01M4/48
CPCY02E60/10
Inventor 马增胜周益春曾维瑶潘勇雷维新朱岭杨阳阳
Owner XIANGTAN UNIV
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