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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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  • Abstract
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  • 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 milling, but the ball milling equipment used in this method is relatively complicated, and the first charge and discharge efficiency of tin-carbon composite materials is low

Method used

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

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preparation example Construction

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

[0023] Weigh tin and graphite according to the mass ratio of 0.03 ~ 0.8 : 1, tin is introduced by tin-containing compounds, ball mill in a ball mill jar for 1 ~ 100 h, the mass of the ball and graphite material is 0.2 ~ 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 alkali substances is 0.6 to 1: 1, and the ball mill is 1~ 100 h; then add organic carbon source and carry out ball milling mixing, the mass ratio of organic carbon source and graphite is 0.01 ~ 0.2: 1, preferably 0.02 ~ 0.06: 1; described organic carbon source is pitch, phenolic resin, epoxy resin , polyacrylamide resin, polyvinylidene fluoride, polyoxyethylene-polyoxypropylene-polyoxyethylene, etc.; the resulting mixture is sintered in a muffle furnace at 600-1100 ° C, and...

Embodiment 1

[0026] Put 45 g of graphite and 1 g of stannous chloride into a ball mill jar and mill for 30 minutes at a speed of 300 rpm, wherein the mass of the ball is 500 g. After they are mixed evenly, add 0.6 g of anhydrous sodium carbonate for ball milling for 5 hours, then add 2.0 g of pitch was recoated, and after ball milling for 1 h, the mixture was fired at 800 °C for 5 h in a nitrogen atmosphere to obtain a tin-carbon composite material precursor. The tin-carbon composite material precursor was washed and filtered, and dried overnight at 85 °C to obtain a tin-carbon composite negative electrode material, which was designated as sample 1.

[0027] The above-prepared tin-carbon composite material is the positive electrode, the lithium sheet is the negative electrode, and the electrolyte is 1mol / l LiPF 6 EC / DMC (1:1) solution, the diaphragm is a composite diaphragm of polypropylene and polyethylene. The ratio of active material: CMC: SBR=96:2:2 is used to prepare pole pieces. Th...

Embodiment 2-5

[0029] The preparation method of negative electrode material is identical with embodiment 1, difference is, prepare 4 samples, change the mass ratio of graphite and tin, be respectively 45:5, 45:10, 45:25 and 45:40, simultaneously the sodium carbonate The molar ratio control of the amount and tin is the same as in Example 1, and the consumption of anhydrous sodium carbonate is respectively 3g, 6g, 15g and 24g, and the prepared samples are respectively designated as sample 2, sample 3, sample 4 and sample 5.

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

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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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