Method for preparing tin-copper alloy materials and carbon covered tin-copper alloy materials

A technology of tin-copper alloy and carbon coating, which is applied in metal material coating process, liquid chemical plating, coating, etc., can solve the problems of harsh preparation conditions, difficulty in large-scale production, complex process, etc., and achieve stable performance, The effect of high capacity and simple process

Active Publication Date: 2013-11-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cu prepared by these methods 6 sn 5 Has good electrochemical performance, but the preparation conditions are harsh, energy consumption is large, and the process is complicated and difficult to produce on a large scale

Method used

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  • Method for preparing tin-copper alloy materials and carbon covered tin-copper alloy materials
  • Method for preparing tin-copper alloy materials and carbon covered tin-copper alloy materials
  • Method for preparing tin-copper alloy materials and carbon covered tin-copper alloy materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Put 100ml of distilled water into a 250ml beaker, add 4g of citric acid, 8g of sodium hypophosphite, 4g of thiourea, 0.01mol of stannous sulfate in sequence, add concentrated sulfuric acid dropwise to control the pH of the plating solution within 1.0, and heat the plating solution to 55°C . 1g of 0.1 micron copper powder was stirred and dispersed in 10ml of ethanol to prepare a copper powder suspension. Then, the suspension of copper powder is added into the electroless plating solution, and the reaction time is 20 minutes. After drying, copper-tin core-shell structure powder is obtained. The obtained tin-plated copper powder was heat-treated at 200° C. for 20 h to prepare copper-tin alloy powder.

Embodiment 2

[0047] Add 100ml of distilled water into a 250ml beaker, add 4g of citric acid, 8g of sodium hypophosphite, 8g of thiourea, 0.01mol of stannous sulfate in sequence, add concentrated sulfuric acid dropwise to control the pH of the plating solution within 1.0, and heat the plating solution to 55°C . 1g of 0.1 micron copper powder was stirred and dispersed in 10ml of ethanol to prepare a copper powder suspension. Then, the suspension of copper powder is added into the electroless plating solution, and the reaction time is 20 minutes. After drying, copper-tin core-shell structure powder is obtained. The obtained tin-plated copper powder was heat-treated at 200° C. for 20 h to prepare copper-tin alloy powder.

Embodiment 3

[0049] Put 100ml of distilled water into a 250ml beaker, add 4g of citric acid, 8g of sodium hypophosphite, 10g of thiourea, 0.01mol of stannous sulfate in sequence, add concentrated sulfuric acid dropwise to control the pH of the plating solution within 1.0, and heat the plating solution to 55°C . 1g of 0.1 micron copper powder was stirred and dispersed in 10ml of ethanol to prepare a copper powder suspension. Next, the suspension of copper powder was added into the electroless plating solution, and the reaction time was 10 minutes. After drying, copper-tin core-shell structure powder is obtained. The obtained tin-plated copper powder was heat-treated at 200° C. for 20 h to prepare copper-tin alloy powder.

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Abstract

The invention discloses a method for preparing tin-copper alloy materials and carbon covered tin-copper alloy materials, which is characterized in that the process is simple, the particle size is easy to control, and in addition, the prepared tin-copper alloy materials and carbon covered tin-copper alloy materials are used as negative electrode materials of lithium ion batteries and have the advantages of high capacity and stable performance.

Description

(1) Technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a tin-copper alloy material and a carbon-coated tin-copper alloy material. (2) Background technology [0002] Lithium-ion battery is a new generation of green high-energy secondary battery. Due to the advantages of high energy density, long cycle life, high working voltage, small self-discharge, no memory effect and wide working temperature range, lithium-ion batteries have been widely used in notebook computers, mobile communications, digital cameras and other electronic products. With its application in large-scale equipment such as electric bicycles, electric vehicles, and energy storage power supplies, the capacity and power of lithium-ion batteries need to be further improved, but the current positive and negative electrode materials cannot meet its requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/52B22F1/02H01M4/38H01M4/134
CPCY02E60/122Y02E60/10
Inventor 王连邦姚金翰张品杰
Owner ZHEJIANG UNIV OF TECH
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