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Method for preparing conductive carbon film-coated calcium or calcium-tin alloy serving as anode material of lithium battery

A technology of conductive carbon film and negative electrode material, used in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as poor cycle performance, achieve uniform thickness, easy preparation, and improve electrochemical kinetic performance.

Inactive Publication Date: 2011-06-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Metallic tin can form with Li up to Li 4.4 An alloy of Sn with a high theoretical specific capacity (992 mAh g -1 ), but when Li and Sn form an alloy, it is accompanied by a huge volume expansion and poor cycle performance

Method used

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  • Method for preparing conductive carbon film-coated calcium or calcium-tin alloy serving as anode material of lithium battery
  • Method for preparing conductive carbon film-coated calcium or calcium-tin alloy serving as anode material of lithium battery
  • Method for preparing conductive carbon film-coated calcium or calcium-tin alloy serving as anode material of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Preparation of carbon-coated calcium material

[0034] Take metal calcium particles with a purity of 99.99% and heat to 850 o After C is melted, it is sprayed with high-purity argon (purity 99.999%) and sprayed into the polyethylene glycol liquid. The calcium droplets are cooled in the polyethylene glycol liquid to form a spherical powder. At the same time, the calcium droplets that are in contact with the calcium droplets The polyethylene glycol is carbonized to form a carbon-coated calcium material. Polyethylene glycol has a molecular weight of 800 and a purity of 99%.

[0035] Filter out the carbon-coated calcium material and calcinate it again in a vacuum atmosphere with the temperature controlled at 600 o C, Further carbonization to remove polyethylene glycol remaining on the carbon-coated calcium material. After cooling, the carbon-coated calcium material is obtained as the negative electrode material for high-capacity lithium-ion batteries.

Embodiment 2

[0036] Example 2: Carbon-coated Ca-Ca 2 Preparation of Sn eutectic alloy

[0037] Take metal calcium and tin particles with a purity of 99.99% in a mass ratio of 58:42, at 900 o After C is melted, it is sprayed with high-purity argon (purity 99.999%) and sprayed into the polyethylene glycol liquid. The calcium-tin alloy droplets form spherical Ca-Ca after cooling in the polyethylene glycol liquid. 2 Sn eutectic powder, at the same time, the polyethylene glycol in contact with Ca-Sn alloy droplets is carbonized to form carbon-coated Ca-Ca 2 Sn eutectic material. Polyethylene glycol has a molecular weight of 600 and a purity of 99%. Filter out carbon-coated Ca-Ca 2 Sn eutectic material, calcined again in the atmosphere of high-purity argon (purity 99.999%), the temperature is controlled at 700 o C, Further carbonization to remove polyethylene glycol remaining on the carbon-coated calcium material. After cooling, carbon-coated Ca-Ca 2 Sn eutectic materials are used as anod...

Embodiment 3

[0038] Example 3: Carbon-coated CaSn-CaSn 3 Eutectic Alloy Preparation

[0039] Take metal calcium and tin particles with a purity of 99.99% according to the mass ratio of 13.5:86.5, at 700 o After C is melted, it is sprayed with high-purity argon (purity 99.999%) and sprayed into the polyethylene glycol liquid. The calcium-tin alloy droplets form spherical CaSn-CaSn after cooling in the polyethylene glycol liquid. 3 Eutectic powder, at the same time, the polyethylene glycol in contact with the calcium-tin alloy droplets is carbonized to form carbon-coated CaSn-CaSn 3 eutectic material. Polyethylene glycol has a molecular weight of 200 and a purity of 99%. Filter out carbon-coated CaSn-CaSn 3 Eutectic material, calcined again in an atmosphere of high-purity argon (purity 99.999%), the temperature is controlled at 550 o C, Further carbonization to remove polyethylene glycol remaining on the carbon-coated calcium material. After cooling, carbon-coated CaSn-CaSn 3 Eutectic...

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Abstract

The invention relates to a method for preparing an anode material of a lithium battery and aims to provide a method for preparing a conductive carbon film-coated calcium or calcium-tin alloy serving as the anode material of the lithium battery. The method comprises the following steps of: melting high-purity calcium metal or calcium metal and tin metal, spraying into polyethylene glycol liquid byusing high purity argon, and cooling fog drops in the polyethylene glycol liquid to obtain spherical powder; carbonizing polyethylene glycol to obtain a carbon coated calcium material; filtering out the carbon coated calcium material; calcining again in vacuum or high purity nitrogen atmosphere at the temperature of below 700 DEG C; further carbonizing to remove residual polyethylene glycol on the carbon coated calcium material; and cooling to obtain the conductive carbon film-coated calcium serving as the anode material for preparing the lithium battery. A conductive carbon film is formed onthe surfaces of the calcium or calcium-tin alloy particles and is favorable for the stability of an electrode structure. A gas spraying method for preparing the carbon coated material is favorable for scale production and cost reduction.

Description

technical field [0001] The invention relates to a preparation method of a negative electrode material of a lithium ion battery, in particular to a preparation method of a conductive carbon film-coated calcium or calcium-tin material. Background technique [0002] Lithium-ion batteries have the advantages of light weight, large capacity, and no memory effect, so they have been widely used. Many digital devices now use lithium-ion batteries as power sources. The energy density of lithium-ion batteries is very high, its capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight, and its advantages such as low self-discharge rate and no toxic substances are important reasons for its wide application. In 1990, Nagoura and others in Japan developed a negative electrode with petroleum coke and LiCoO 2 Lithium-ion battery as the positive electrode: LiC 6 |LiClO 4 -PC+EC|LiCoO 2 . same year. Two major battery companies, Moli and Sony, announced that ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M10/052
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 李洲鹏刘宾虹
Owner ZHEJIANG UNIV
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