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Nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material of lithium ion secondary battery and preparation method

A technology for secondary batteries and negative electrode materials, applied in secondary batteries, battery electrodes, negative electrodes, etc., can solve the problems that affect the commercialization of silicon-based negative electrode materials, shorten the service life, and poor electrical conductivity, and achieve improved electrical conductivity. and cycle performance, improved surface properties, and the effect of improved cycle performance

Inactive Publication Date: 2020-07-10
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with carbon-based materials, silicon-based materials have huge capacity advantages, but their disadvantages are also very obvious. The main disadvantages of silicon-based materials are large cycle expansion and poor electrical conductivity. Among them, the expansion rate of silicon-based negative electrode materials can reach 300. %, the silicon-oxygen negative electrode material also has an expansion rate of nearly 200%. Such a high expansion rate causes silicon-based materials to be easily pulverized and peeled off during the cycle of use as the negative electrode material of lithium-ion secondary batteries, resulting in reduced capacity and long service life. shortened, seriously affecting the commercialization of silicon-based anode materials

Method used

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  • Nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material of lithium ion secondary battery and preparation method
  • Nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material of lithium ion secondary battery and preparation method
  • Nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material of lithium ion secondary battery and preparation method

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Effect test

Embodiment 1

[0029] Dissolve tetraethyl orthosilicate in aqueous solution, the mass ratio of tetraethyl orthosilicate to water is 1:5, add hydrochloric acid to adjust PH=2, heat in a water bath with mechanical stirring, set the temperature at 60°C, and set the stirring speed 200rpm, the stirring time is 30min, then add citric acid, the molar ratio of tetraethyl orthosilicate to citric acid is 1:0.5, the temperature and stirring speed remain unchanged, the stirring time is 120min, then add melamine, tetraethyl orthosilicate The molar ratio of ester to melamine is 1:0.2, the temperature and stirring speed are kept constant, and the stirring time is 120min. After the reaction is completed, it is dried in an oven at 80°C. Put the dried material into a box furnace for roasting, the roasting temperature is 1000°C, under the protection of nitrogen atmosphere, the heating rate is 3°C / min, and the temperature is kept for 6h. After cooling, the semi-finished nitrogen-containing silicon-oxygen-carbon ...

Embodiment 2

[0031] Dissolve tetraethyl orthosilicate in aqueous solution, the mass ratio of tetraethyl orthosilicate to water is 1:5, add hydrochloric acid to adjust PH=2, heat in a water bath with mechanical stirring, set the temperature at 60°C, and set the stirring speed 200rpm, the stirring time is 30min, then add citric acid, the molar ratio of tetraethyl orthosilicate to citric acid is 1:0.8, the temperature and stirring speed remain unchanged, the stirring time is 120min, then add melamine, tetraethyl orthosilicate The molar ratio of ester to melamine is 1:0.4, the temperature and stirring speed are kept constant, and the stirring time is 120min. After the reaction is completed, it is dried in an oven at 80°C. Put the dried material into a box furnace for roasting, the roasting temperature is 1000°C, under the protection of nitrogen atmosphere, the heating rate is 3°C / min, and the temperature is kept for 6h. After cooling, the semi-finished nitrogen-containing silicon-oxygen-carbon ...

Embodiment 3

[0033]Dissolve tetraethyl orthosilicate in aqueous solution, the mass ratio of tetraethyl orthosilicate to water is 1:5, add hydrochloric acid to adjust PH=2, heat in a water bath with mechanical stirring, set the temperature at 60°C, and set the stirring speed 200rpm, the stirring time is 30min, then add citric acid, the molar ratio of tetraethyl orthosilicate to citric acid is 1:1, the temperature and stirring speed remain unchanged, the stirring time is 120min, then add melamine, tetraethyl orthosilicate The molar ratio of ester to melamine is 1:0.6, the temperature and stirring speed are kept constant, and the stirring time is 120min. After the reaction is completed, it is dried in an oven at 80°C. Put the dried material into a box furnace for roasting, the roasting temperature is 1000°C, under the protection of nitrogen atmosphere, the heating rate is 3°C / min, and the temperature is kept for 6h. After cooling, the semi-finished nitrogen-containing silicon-oxygen-carbon com...

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Abstract

The invention discloses a preparation method of a nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material of a lithium ion secondary battery, which comprises the following steps: stirring and mixing a silicon-oxygen precursor, a carbon source and a nitrogen source in an acidic aqueous solution to form slurry; drying the slurry, and carrying out high-temperature roasting, cooling, crushing and scattering under a protective gas to obtain a carbonized nitrogen-containing porous silicon-oxygen-carbon compound precursor; and blending the obtained nitrogen-containingporous silicon-oxygen carbide precursor with a carbon coating material, and carrying out high-temperature carbonization, cooling, crushing and scattering under a protective gas to prepare the nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material with a uniform and stable coating structure for the lithium ion secondary battery. The lithium ion secondary battery nitrogen-containing silicon-oxygen-carbon compound composite negative electrode material prepared by the preparation method has good negative electrode material conductivity and cycle performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a nitrogen-containing silicon-oxygen-carbon compound negative electrode material for a lithium-ion secondary battery and a preparation method thereof. Background technique [0002] Silicon-based anode materials for lithium-ion secondary batteries have a higher theoretical specific capacity than traditional lithium-ion anode materials, carbon-based anode materials (maximum theoretical specific capacity 372mAh / g), and the maximum theoretical specific capacity of silicon-based anode materials has reached 4200mAh / g, the maximum theoretical specific capacity of silicon-oxygen anode materials has also reached 2100mAh / g, its specific capacity is much larger than that of carbon-based anode materials, and has greater commercial value and development prospects. [0003] Compared with carbon-based materials, silicon-based materials have huge capacity advantages, but their disa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48H01M10/0525
CPCH01M4/483H01M4/624H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 仰永军王飞
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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