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A preparation method of cobalt hydroxide-carbon composite negative electrode material for lithium ion battery

A lithium-ion battery, cobalt hydroxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of cumbersome process routes, poor first efficiency and cycle performance, and high energy consumption, and achieve simple process and stable cycle. The effect of uniform dispersion of performance and structure

Active Publication Date: 2017-09-05
博路天成新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Despite the high specific capacity of the reported CoO, its first-time efficiency and cycle performance are poor
Cobalt hydroxide has been widely used in nickel-metal hydride batteries, and it has also been widely studied and synthesized as a precursor of lithium-ion battery electrode materials, but it is all to be sintered into cobalt oxides (CoO or Co 3 o 4 ), it can be used as an electrode material for lithium-ion batteries, and the process route used is cumbersome and consumes a lot of energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of Porous Carbon Nanotubes

[0021] Weigh starch, concentrated sulfuric acid, water and template silica according to the weight ratio of 1:0.15:10:2, mix and stir evenly for 6 hours, put the mixture into an oven, and the oven temperature rise rate is 20°C per hour, the temperature Raise to 200°C and keep for 3 hours. After the solvent evaporates, put the mixture into a high-temperature reactor protected by an inert gas for roasting. Put the calcined mixture into potassium hydroxide and stir for 15 hours to dissolve the silica template, then filter, wash, and dry to obtain porous carbon nanotubes with hollow nanotubes inside;

[0022] Cobalt Hydroxide-Porous Carbon Nanotube Composite

[0023] The above-mentioned porous carbon nanotubes were refluxed with concentrated sulfuric acid at 80° C. for 1 hour; then 5 parts of the refluxed porous carbon nanotubes were added to 200 parts of ethylene glycol-water solution, and the ethylene glycol in the ethylene glycol...

Embodiment 2

[0027] Preparation of Porous Carbon Nanotubes

[0028] Weigh starch, concentrated sulfuric acid, water and template silica according to the weight ratio of 1:0.1:1:0.5, mix and stir evenly for 3 hours, put the mixture into an oven, and the oven temperature rise rate is 10°C per hour, the temperature Raise to 150°C and keep for 8 hours. After the solvent evaporates, put the mixture into a high-temperature reactor protected by an inert gas for roasting. The temperature increase rate of the high-temperature reactor is 50°C per hour, and the temperature is raised to 500°C. Put the calcined mixture into potassium hydroxide and stir for 10 hours to dissolve the silica template, then filter, wash, and dry to obtain porous carbon nanotubes with hollow nanotubes inside;

[0029] Cobalt Hydroxide-Porous Carbon Nanotube Composite

[0030] The above-mentioned porous carbon nanotubes were refluxed with concentrated sulfuric acid at 60°C for 2 hours; then 2 parts of the refluxed porous car...

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Abstract

The invention provides a cobalt hydroxide-carbon composite cathode material of a lithium ion battery and a preparation method thereof. The method comprises weighing starch, concentrated sulfuric acid, water and a silica template, roasting to obtain porous carbon nanotube with hollow nanometer carbon tube inside; using the concentrated sulfuric acid for reflux, adding the above product into a glycol-water solution, adjusting a pH value by using cobalt oxalate, sodium bicarbonate and potassium borate, performing a hydrothermal reaction to obtain a cobalt hydroxide-porous carbon nanotube composite material; mixing the above product with acetylene black, carboxymethyl cellulose and water, and uniformly mixing by isopropanol to obtain the composite cathode material. The preparation method provided by the invention is relatively simple; and by uniformly distributing the cobalt hydroxide in and out of the porous carbon nanotube, the prepared cobalt hydroxide-porous carbon nanotube composite material is stable in structure and uniform in distribution, and thus has a high energy density and furthermore a stable cyclic performance; and when used as the cathode material of the lithium ion battery, is high in specific capacity and long in service life.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery, in particular to a cobalt hydroxide-carbon composite negative electrode material for a lithium ion battery and a preparation method thereof. Background technique [0002] The trend of miniaturization, high energy, and portability of electronic appliances, the development of space technology, the demand for national defense equipment, and the research and development of electric vehicles have higher requirements for the performance of lithium-ion batteries. [0003] The improvement of the performance of lithium-ion batteries mainly depends on the improvement of energy density and cycle life of lithium-intercalated electrode materials. At present, most of the commercialized lithium-ion batteries use lithium transition metal oxide / graphite system as the negative electrode active material. As the lithium-ion battery negative electrode material, CoO The theoretical specific capacity is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/52H01M4/583
CPCY02E60/10
Inventor 姜波
Owner 博路天成新能源科技有限公司
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