Lithium ion battery negative electrode material silicon oxide doped manganese oxide/carbon tube and preparation method thereof

A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low material specific capacity, complicated preparation steps, and poor performance, and achieve high ion conductivity and simple preparation process , the effect of low reaction temperature

Active Publication Date: 2017-08-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation steps of this method are complicated, and the specific capacity of the prepared material is lower than 500mAh / g, and the performance is poor.

Method used

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  • Lithium ion battery negative electrode material silicon oxide doped manganese oxide/carbon tube and preparation method thereof
  • Lithium ion battery negative electrode material silicon oxide doped manganese oxide/carbon tube and preparation method thereof
  • Lithium ion battery negative electrode material silicon oxide doped manganese oxide/carbon tube and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Disperse 10mg of carbon nanotubes in a low-carbon alcohol solution of N,N-dimethylformamide (mixed with 25mL of ethanol and 25mL of N,N-dimethylformamide) to obtain a carbon nanotube dispersion ;

[0036] (2) Dissolve 151mg of manganese sulfate (1mmol), 2g of urea (33.30mmol) and 35μL of ethyl orthosilicate (0.16mmol) in the carbon nanotube dispersion obtained in step (1), stir well, and then fill it into 100 mL Put it in a stainless steel reaction kettle lined with polytetrafluoroethylene, place it in a drying oven, and conduct a hydrothermal reaction at 180°C for 4 hours, then cool it down to room temperature naturally, filter, and wash the precipitate with absolute ethanol and deionized water respectively. 3 times, freeze-dried at -45°C and vacuum degree of 35Pa for 48 hours to obtain black powder;

[0037] (3) The black powder obtained in step (2) was calcined in high-purity argon at 800°C for 2 hours, and cooled to room temperature with the furnace to obtain s...

Embodiment 2

[0043] (1) Disperse 20mg of carbon nanotubes in a low-carbon alcohol solution of N,N-dimethylformamide (mixed with 20mL of ethanol and 30mL of N,N-dimethylformamide) to obtain carbon nanotube dispersion liquid;

[0044] (2) Dissolve 357.9 mg of manganese nitrate (2 mmol), 5 g of glycine (66.60 mmol) and 55 μL of ethyl orthosilicate (0.25 mmol) in the carbon nanotube dispersion obtained in step (1), stir evenly, and then fill 100 Put it in a stainless steel reaction kettle lined with polytetrafluoroethylene, place it in a drying oven, and conduct a hydrothermal reaction at 180°C for 6 hours, then naturally cool to room temperature, filter, and wash with absolute ethanol and deionized water respectively Precipitate 3 times, freeze-dry at -45°C, vacuum 35Pa for 48h to obtain black powder;

[0045] (3) The black powder obtained in step (2) was calcined in high-purity argon at 750°C for 3 hours, and cooled to room temperature with the furnace to obtain silicon oxide-doped manganes...

Embodiment 3

[0050] (1) Disperse 10mg of carbon nanotubes in a low-carbon alcohol solution of N,N-dimethylformamide (mixed with 20mL of methanol and 40mL of N,N-dimethylformamide) to obtain carbon nanotube dispersion liquid;

[0051] (2) Dissolve 214.74mg of manganese nitrate (1.2mmol), 2.5g of urea (41.63mmol) and 40μL of isopropyl silicate (0.13mmol) in the carbon nanotube dispersion obtained in step (1), stir evenly, and refill Put it into a 100 mL stainless steel reaction kettle lined with polytetrafluoroethylene, place it in a dry box, and conduct a hydrothermal reaction at 160°C for 4 hours, then cool it down to room temperature naturally, filter, and wash with anhydrous methanol and deionized water respectively. The precipitate was washed twice successively, and then freeze-dried at -50°C and vacuum degree of 40Pa for 36 hours to obtain a black powder;

[0052] (3) Calcinate the black powder obtained in step (2) in argon / hydrogen mixed gas (where the volume fraction of hydrogen is ...

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Abstract

The invention relates to a lithium ion battery negative electrode material silicon oxide doped manganese oxide/carbon tube and a preparation method thereof. The material is prepared according to the following method of (1) dispersing a carbon nanotube in a lower alcohol solution of N, N-dimethylformamide to obtain a carbon nanotube dispersion liquid; (2) dissolving a manganese source, a precipitator and a silicon source in the carbon nanotube dispersion liquid, uniformly stirring the mixture, naturally cooling the mixture to a room temperature after hydrothermal reaction, and performing filtering, washing, freezing and drying to obtain black powder; and (3) calcining the black powder in a protective atmosphere, and cooling the product with a furnace to the room temperature so as to obtain the lithium ion battery negative electrode material silicon oxide doped manganese oxide/carbon tube. The material is uniform in morphology and size, and silicon oxide doped manganese oxide particles are grown on a surface of the carbon nanotube; the material has the advantages of high electron conductivity and ion conductivity, short ion diffusion passage, small volume effect during lithium ion intercalation/de-intercalation process and the like; and the material is simple in preparation process, short in period, low in reaction temperature and low in cost, a large amount of materials can be synthesized, and the product yield is high.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method, in particular to a lithium ion battery negative electrode material silicon oxide doped with manganese oxide / carbon tube and a preparation method. Background technique [0002] With the development of science and technology, the popularization of electronic products such as smartphones and laptops and electric vehicles has put forward higher requirements for batteries as their energy sources. Lithium-ion batteries stand out due to their high energy density and environmental friendliness. At present, the negative electrode material of lithium-ion batteries is mainly made of graphite, which has a low capacity, the theoretical specific capacity is only 372mAh / g, and the cycle performance is poor, which restricts the development of lithium-ion batteries. [0003] Manganese oxide, a transition metal oxide, has become one of the optional materials for lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/50H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 童汇王旭张宝陈核章周其杰喻万景郑俊超张佳峰董鹏远
Owner CENT SOUTH UNIV
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