Preparation method of tin-cobalt alloy cathode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle performance, and achieve the effects of high tap density, low energy consumption, and less time consumption

Inactive Publication Date: 2013-06-26
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor cycle performance caused by the volume expansion of the existing tin-based alloy negative electrode materials, and to provide an environmentally friendly, low cost, large initial capacity, good cycle performance and easy scale production. Preparation method of tin-cobalt alloy negative electrode material for lithium ion battery with advantages

Method used

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  • Preparation method of tin-cobalt alloy cathode material of lithium ion battery
  • Preparation method of tin-cobalt alloy cathode material of lithium ion battery
  • Preparation method of tin-cobalt alloy cathode material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0022] Add an appropriate amount of sulfuric acid to 180 mL of deionized water to adjust the pH to 0.5, then add 40 mg of ascorbic acid, 25 mg of polyvinylpyrrolidone, and finally 6 g of stannous sulfate and 7.8 g of cobalt sulfate to the deionized water to obtain solution A. Add 7 g of sodium carbonate to 80 ml of deionized water to obtain solution B. At room temperature, while stirring, solution B was added dropwise to solution A at the same time to obtain solution C, and stirred for 3 hours after the reaction. The solution C was suction filtered and washed with a large amount of deionized water until there was no sulfate in the filtrate. After suction filtration, the filter cake was dispersed in ethanol by means of stirring and ultrasonic treatment, and then the ethanol was filtered off by suction, and the filter cake was dried in air at 80° C. for 6 hours to obtain a precursor. Weigh 2g of the precursor, 2g of polyvinylpyrrolidone, and ethanol as the solvent, and evaporat...

Embodiment 2

[0026]Add an appropriate amount of sulfuric acid to 200mL of deionized water to adjust the pH to 1, then add 45mg of ascorbic acid, 30mg of polyvinylpyrrolidone to the deionized water, and finally add 9g of stannous sulfate and 4g of cobalt sulfate to obtain solution A. Add 11 g of potassium carbonate to 80 ml of deionized water to obtain solution B. At room temperature, while stirring, solution B was added dropwise to solution A at the same time to obtain solution C, and stirred for 2 hours after the reaction. The solution C was suction filtered and washed with a large amount of deionized water until there was no sulfate in the filtrate. After suction filtration, the filter cake was dispersed in ethanol by means of stirring and ultrasonic treatment, and then the ethanol was filtered off with suction, and the filter cake was dried in air at 80° C. for 12 hours to obtain a precursor. Weigh 2g of the precursor, transfer 2g of glucose to a hydrothermal kettle for hydrothermal tr...

Embodiment 3

[0029] Add an appropriate amount of sulfuric acid to 200mL of deionized water to adjust the pH to 2, then add 45mg of ascorbic acid, 30mg of polyvinylpyrrolidone to the deionized water, and finally add 10g of stannous sulfate and 6g of cobalt sulfate to obtain solution A. Add 8 g of potassium hydroxide to 80 ml of deionized water to obtain solution B. At room temperature, while stirring, solution B was added dropwise to solution A at the same time to obtain solution C, and stirred for 2 hours after the reaction. The solution C was suction filtered and washed with a large amount of deionized water until there was no sulfate in the filtrate. After suction filtration, the filter cake was dispersed in ethanol by means of stirring and ultrasonic treatment, and then the ethanol was filtered off with suction, and the filter cake was dried in air at 80° C. for 12 hours to obtain a precursor. Weigh 2g of the precursor, 2g of stearic acid, and ethanol as the solvent, and evaporate the ...

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Abstract

The invention provides a preparation method of a tin-cobalt alloy cathode material of a lithium ion battery, and relates to a cathode material of a lithium ion battery. The invention provides the preparation method of the tin-cobalt alloy cathode material of the lithium ion battery, which has the advantages of environment friendliness, low cost, large original capacity, good circulation property, easiness of large-scale production and the like. The preparation method comprises the following steps of: adding acid into de-ionized water, controlling a pH (Potential of Hydrogen) value to be equal to 0.5-2 and adding a tin source, a cobalt source, a surfactant and a stabilizer, so as to obtain a solution A; secondly, dissolving a precipitant in the de-ionized water, so as to obtain a solution B; adding the solution B into the solution A, stirring, then filtering and washing a reacted solution, so as to obtain a filter cake, diffusing the filter cake in an organic solvent, filtering the organic solvent and smashing the dried filter cake to obtain a precursor; doping the obtained precursor in a carbon source, uniformly mixing the precursor and the carbon source, then placing a mixture in a tube furnace, heating the mixture to a temperature of 700-1000 DEG C, keeping the temperature for 2-6h and then cooling to a room temperature, so as to obtain the tin-cobalt alloy cathode material of the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material, in particular to a preparation method of a lithium ion battery tin-cobalt alloy negative electrode material. Background technique [0002] At present, the negative electrode materials of commercialized lithium-ion batteries are graphite and various carbon materials based on graphite. This material has good reversible charge and discharge performance, but the theoretical capacity of carbon materials is low, only 372mAh g -1 , and its energy loss is large and its high rate charge and discharge performance is poor. When the battery is overcharged, lithium dendrites are easily formed on the surface of the carbon and cause a short circuit, thereby increasing safety hazards, etc., and it is difficult to meet the needs of the rapid development of electronic technology in today's era. Therefore, it is imminent to develop new and reliable high-capacity lithium-ion battery anode materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38
CPCY02E60/10
Inventor 李君涛吴振国孙世刚钟本和黄令郭孝东
Owner XIAMEN UNIV
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