Method for preparing tin-carbon composite negative electrode material

A negative electrode material, tin-carbon technology, is applied in the preparation of tin-carbon composite materials. The application field of tin-carbon composite materials in the battery industry can solve the problems of low initial charge and discharge efficiency of tin-carbon composite materials and complex ball milling equipment, etc. High capacity, simple process, good cycle stability

Inactive Publication Date: 2015-04-29
JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, CN102185135B and CN102427127A disclose a method for preparing tin-carbon composite materials by dielectric barrier discharge plasma-assisted high-energy ball m

Method used

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  • Method for preparing tin-carbon composite negative electrode material
  • Method for preparing tin-carbon composite negative electrode material

Examples

Experimental program
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Example Embodiment

[0022] The process of the preparation method of the present invention is as follows:

[0023] Weigh the tin and graphite in a mass ratio of 0.03 ~ 0.8:1, the tin is introduced by a tin compound, and ball milled in a ball milling tank for 1 to 100 h. The mass of the ball and graphite material is 0.2 to 10:1, and then add One or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate, and urea are used as solid alkaline substances. The molar ratio of tin to solid alkaline substances is 0.6 ~ 1: 1, ball milling 1~ 100 h; then add organic carbon source for ball milling and mixing, the mass ratio of organic carbon source to graphite is 0.01 ~ 0.2:1, preferably 0.02 ~ 0.06:1; the organic carbon source is pitch, phenolic resin, epoxy resin , Polyacrylamide resin, polyvinylidene fluoride, polyoxyethylene-polyoxypropylene-polyoxyethylene, etc.; the obtained mixture is sintered in a muffle furnace at 600-1100℃, and then washed with deionized ...

Example Embodiment

[0025] Example 1

[0026] Put 45 g of graphite and 1 g of stannous chloride into a ball milling tank for 30 minutes at 300 rpm, and the mass of the ball is 500 g. After they are mixed, add 0.6 g of anhydrous sodium carbonate and ball mill for 5 hours, then add 2.0 g of pitch was re-coated, and after ball milling for 1 hour, the mixture was calcined at 800° C. in a nitrogen atmosphere for 5 hours to prepare a tin-carbon composite precursor. The tin-carbon composite material precursor was washed and filtered, and dried overnight at 85°C to obtain a tin-carbon composite anode material, which was recorded as sample 1.

[0027] The tin-carbon composite material prepared above is the positive electrode, the lithium sheet is the negative electrode, and the electrolyte is 1mol / l LiPF 6 The EC / DMC (1:1) solution, the diaphragm is a polypropylene and polyethylene composite diaphragm. Active material: CMC: SBR=96:2:2 to prepare pole pieces. The test charge-discharge rate is 0.2 C, the charg...

Example Embodiment

[0028] Example 2-5

[0029] The preparation method of the negative electrode material is the same as that of Example 1, except that 4 samples were prepared and the mass ratio of graphite to tin was changed to 45:5, 45:10, 45:25 and 45:40, and the sodium carbonate The control of the molar ratio between the amount and the tin is the same as in Example 1. The amount of anhydrous sodium carbonate is 3g, 6g, 15g and 24g respectively. The prepared samples are marked as sample 2, sample 3, sample 4 and sample 5, respectively.

[0030] The tin-carbon composite material prepared above is the positive electrode, the lithium sheet is the negative electrode, and the electrolyte is 1mol / l LiPF 6 The EC / DMC (1:1) solution, the diaphragm is a polypropylene and polyethylene composite diaphragm. Active material: CMC: SBR=96:2:2 to prepare pole pieces. The test charge-discharge rate is 0.2 C, the charge-discharge voltage is 0.005-2.000 V, and the first discharge specific capacity of sample 2 is 420...

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Abstract

The invention provides a method for preparing a tin-carbon composite negative electrode material. The tin-carbon composite negative electrode material is prepared by adopting a method for combining mechanochemistry and high-temperature hot carbon reduction. The method for preparing the negative electrode material comprises the following steps: 1, uniformly mixing graphite and a tin salt; 2, adding a solid alkaline substance into the mixture in the step 1 so as to carry out a mechanochemical reaction; 3, adding a certain amount of organic carbon source into the mixture in the step 2 for mixing; 4, sintering the mixture in the step 3 in a muffle furnace; and 5, washing, filtering and drying the tin-carbon mixture in the step 4, thereby obtaining the tin-carbon composite material. According to the negative electrode material prepared by the method disclosed by the invention, the capacity and cycle performance of the battery can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of composite materials and relates to the preparation of a tin-carbon composite material; the invention also relates to the application of the tin-carbon composite material in the battery industry. Background technique [0002] With the increasingly prominent energy crisis and environmental problems, the research and development of new alternative energy sources and energy conservation and emission reduction have important developmental strategic significance. For example, the development and use of zero-emission electric vehicles (EVs), hybrid electric vehicles (HEVs), etc. Lithium-ion batteries are widely used as an important energy storage device, and have begun to achieve certain applications in energy storage such as electric vehicles (EVs) and hybrid electric vehicles (HEVs). [0003] The anode material of lithium ion battery is an important part of the battery, and the anode material plays a pivotal ...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/587H01M4/36H01M10/0525
CPCH01M4/139H01M4/362H01M10/0525Y02E60/10
Inventor 邱根萍杨建锋黄雨生
Owner JIANGXI ZHENGTUO NEW ENERGY TECH CO LTD
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