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Tin/copper foam alloy cathode material for lithium ion cells and preparation method thereof

A lithium-ion battery, alloy negative electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance, low specific capacity, etc., to achieve increased lithium ion exchange capacity, high charge-discharge specific capacity, The effect of improving battery performance

Active Publication Date: 2011-04-13
HUNAN YONGSHENG NEW MATERIALS
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  • 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 foam with uniform and stable microstructure, less impurity content and excellent performance for lithium batteries, aiming at the shortcomings of the existing tin-copper alloy negative electrode materials with low specific capacity and poor cycle performance Alloy negative electrode material and preparation method thereof

Method used

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  • Tin/copper foam alloy cathode material for lithium ion cells and preparation method thereof
  • Tin/copper foam alloy cathode material for lithium ion cells and preparation method thereof
  • Tin/copper foam alloy cathode material for lithium ion cells and preparation method thereof

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Experimental program
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Embodiment 1

[0060] 130PPI foam copper strip is selected as the electroplating substrate.

[0061] 1. Pretreatment of foamed copper strip:

[0062] Degreasing fluid:

[0063] Sodium hydroxide 30g / L

[0064] Sodium carbonate 40g / L

[0065] Sodium Phosphate 30g / L

[0066] Sodium silicate 8g / L

[0067] Degreasing temperature: 80°C

[0068] Activation solution:

[0069] Sulfuric acid: 25g / L

[0070] Activation temperature: room temperature

[0071] Pour the pretreatment solution into the pretreatment tank of the continuous electroplating apparatus in sequence, and heat it to the specified temperature.

[0072] 2. Preparation of electroplating solution

[0073] The plating solution formula of the tin plating layer is,

[0074] Sodium stannate 80

[0075] Sodium hydroxide 9g / L

[0076] Hydrogen peroxide 25g / L

[0077] Plating temperature 70°C

[0078] The plating solution formula of electroplating copper layer is,

[0079] Copper pyrophosphate 60g / L

[0080] Potassium pyrophospha...

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Abstract

The invention discloses a tin / copper foam alloy cathode material for lithium ion cells and a preparation method thereof. In the invention, foam copper serving as a substrate is coated and plated with tin / copper alternate multilayer lamination structure; and then the tin / copper alloy cathode material is obtained by heat treatment. A tin coating is formed directly on the foam copper strip substrate, and a copper coating is formed on the outmost layer; in the multilayer lamination structure, each coating is 0.1 to 1.0 micrometer thick, and the thicknesses of all coatings are the same; the thickness ratio of each tin coating to each copper coating is 1:1.7-1:2.1; and the heat treatment temperature is 150 to 400 DEG C and the heat treatment time is 0.5 to 6 hours. The tin / copper foam alloy cathode material prepared by the method has a high charge-discharge specific capacity and high cycle performance; and the maximum primary discharge specific capacity is up to 610mAh / g, and after 50 circles, the specific capacity reduces only by 1 to 3 percent. In the invention, the preparation process is simple, and large-scale industrial production can be performed.

Description

technical field [0001] The invention belongs to the field of lithium electronic battery manufacturing, and in particular relates to a tin-copper alloy negative electrode material for a lithium ion battery prepared by electroplating Sn and Cu on the surface of foamed copper, followed by rapid heat treatment, and a preparation method thereof. technical background [0002] With the development of society, the rapid development of electric tools and mobile electronic products, people have higher and higher requirements for the storage capacity and charge and discharge rate of lithium-ion batteries. At present, the anode material that has been industrially produced is carbon material, and its theoretical specific capacity is 372mAh / g. The actual application of carbon anode capacity is very close to its theoretical specific capacity. High irreversible capacity loss, the protective layer of graphitized carbon material may decompose at high temperature, making the battery invalid or...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/1395C25D5/10C25D5/50C25D3/30C25D3/38
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 潘俊安刘小铷尹业文郭立波向阳
Owner HUNAN YONGSHENG NEW MATERIALS
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