Tin-copper alloy cathode material used for lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle performance and low specific capacity, and achieve continuous electroplating, high charge and discharge specific capacity, and reduce electroplating the effect of time

Inactive Publication Date: 2011-02-09
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a tin-copper alloy negative electrode for lithium batteries with uniform and stable microstructure, less impurity content and excellent p

Method used

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  • Tin-copper alloy cathode material used for lithium ion battery and preparation method thereof
  • Tin-copper alloy cathode material used for lithium ion battery and preparation method thereof
  • Tin-copper alloy cathode material used for lithium ion battery and preparation method thereof

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Experimental program
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Embodiment 1

[0047] Copper strip was chosen as the electroplating substrate.

[0048] 1. Pretreatment of copper strip

[0049] Degreasing solution:

[0050] Sodium hydroxide 30g / L

[0051] Sodium carbonate 40g / L

[0052] Sodium Phosphate 30g / L

[0053] Sodium silicate 8g / L

[0054] Degreasing temperature: 80°C

[0055] Activation solution:

[0056] Sulfuric acid: 40g / L

[0057] Activation temperature: room temperature

[0058] Pour the pretreatment solution into the pretreatment tank of the continuous electroplating apparatus in sequence, and heat it to the specified temperature.

[0059] 2. Preparation of electroplating solution

[0060] The plating solution formula of the tin plating layer is,

[0061] Sodium stannate 80g / L

[0062] Sodium hydroxide 9g / L

[0063] Hydrogen peroxide 25g / L

[0064] Plating temperature 70°C

[0065] The plating solution formula of electroplating copper layer is,

[0066] Copper pyrophosphate 60g / L

[0067] Potassium pyrophosphate 280g / L

[0...

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Abstract

The invention discloses a tin-copper alloy cathode material used for a lithium ion battery and a preparation method thereof. Tin coatings and copper coatings are sequentially and alternately electrotinned on one side of the surface of a copper strip substrate subjected to pretreatment to form a multilayer laminated structure of the tin coatings and the copper coatings, a coating which is adhered to the copper strip substrate is a tin coating, and an outmost coating is the copper coating; in the multilayer laminated structure, the thickness of each coating is 0.1 to 1.0 mu m, and the thicknessof homogeneous coatings is the same; and a thickness ratio of each tin coating and each copper coating is 1:1.7-1:2.1, so that a lithium ion battery cathode material which contains the impure phase content lower than that of a 5 percent Cu6Sn5 layer on the one side of the surface of the copper strip substrate is prepared. The first discharge specific capacity of the lithium ion battery cathode material prepared by the invention can reach 600 mAh/g, and the attenuation of the specific capacity after 50 times of circulation is only 5 to 8 percent. The preparation method of the invention is simple and is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery manufacturing, and relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to a tin-copper alloy negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high power density, good safety performance, and long cycle life, and do not contain lead, cadmium, mercury and other pollutants, so they are an ideal energy storage device. As an important factor to improve the capacity and cycle life of lithium-ion batteries, anode materials have attracted the attention of science 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 furthe...

Claims

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Application Information

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IPC IPC(8): H01M4/1395H01M4/134H01M4/38
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 潘勇雷维新杜超成娟娟范清喜李玮周杰
Owner XIANGTAN UNIV
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