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Sulfur-doped carbon nanowires, and three-dimensional sulfur-doped carbon nanowire network-silicon composite material and preparation method thereof

A technology of carbon nanowires and sulfur doping, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as limiting commercial applications, volume effects, and powdering of electrode materials. Achieve the effects of reducing charge transfer resistance, improving electrochemical performance, and inhibiting volume expansion

Active Publication Date: 2015-08-19
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conductivity of silicon-based materials is poor, and at the same time, there is a serious volume effect in the process of intercalation and extraction of lithium, and the volume change rate is about 400%, which will cause powdering of the electrode material and separation of the electrode material and the current collector.
The above-mentioned defects of silicon-based materials severely limit their commercial application

Method used

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  • Sulfur-doped carbon nanowires, and three-dimensional sulfur-doped carbon nanowire network-silicon composite material and preparation method thereof
  • Sulfur-doped carbon nanowires, and three-dimensional sulfur-doped carbon nanowire network-silicon composite material and preparation method thereof
  • Sulfur-doped carbon nanowires, and three-dimensional sulfur-doped carbon nanowire network-silicon composite material and preparation method thereof

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Embodiment 1

[0040] Embodiment 1: An embodiment of sulfur-doped carbon nanowire lithium-ion battery negative electrode material

[0041] Weigh 0.183g of sodium lauryl sulfate and 0.009g of cetyltrimethylammonium bromide and dissolve them in 20ml of deionized water, and stir for 10 minutes to obtain a clear and transparent solution. Slowly drop 0.096g of 3,4-ethylenedioxythiophene under stirring, add 0.032g of FeCl 3 After obtaining a homogeneous solution. Place it in a 50°C oil bath with argon gas. Under magnetic stirring, the blue-black product poly-3,4-ethylenedioxythiophene was obtained after 10 hours of reaction. Suction filter the obtained product, use distilled water and absolute ethanol as washing solvents in turn, put the precipitate obtained after suction filtration in an oven at 60°C for 12h, cool to room temperature, and then calcinate and carbonize at 800°C under an argon protective atmosphere After 2 hours, the sulfur-doped carbon nanowire lithium ion battery negative elect...

Embodiment 2

[0042] Embodiment 2: An embodiment of sulfur-doped carbon nanowire lithium-ion battery negative electrode material

[0043] Weigh 0.27g of sodium lauryl sulfate and 0.018g of cetyltrimethylammonium bromide and dissolve them in 20ml of deionized water, and stir for 10 minutes to obtain a clear and transparent solution. Slowly drop 0.096g of 3,4-ethylenedioxythiophene under stirring, add 0.032g of FeCl 3 After obtaining a homogeneous solution. Place it in a 50°C oil bath with argon gas. Under magnetic stirring, the blue-black product poly-3,4-ethylenedioxythiophene was obtained after 10 hours of reaction. Suction filter the obtained product, use distilled water and absolute ethanol as washing solvents in turn, put the precipitate obtained after suction filtration in an oven at 60°C for 12h, cool to room temperature, and then calcinate and carbonize at 400°C under an argon protective atmosphere After 4 hours, the sulfur-doped carbon nanowire lithium ion battery negative electr...

Embodiment 3

[0044] Embodiment 3: An embodiment of sulfur-doped carbon nanowire lithium-ion battery negative electrode material

[0045] Weigh 0.458g of sodium lauryl sulfate and 0.022g of cetyltrimethylammonium bromide and dissolve them in 20ml of deionized water, and stir for 10 minutes to obtain a clear and transparent solution. Slowly drop 0.096g of 3,4-ethylenedioxythiophene under stirring, add 0.032g of FeCl 3 After obtaining a homogeneous solution. Place it in a 50°C oil bath with argon gas. Under magnetic stirring, the blue-black product poly-3,4-ethylenedioxythiophene was obtained after 10 hours of reaction. Suction filter the obtained product, use distilled water and absolute ethanol as washing solvents in turn, put the precipitate obtained after suction filtration into an oven at 60°C for 12h, cool to room temperature, and then calcinate and carbonize at 600°C under an argon protective atmosphere After 3 hours, the sulfur-doped carbon nanowire lithium ion battery negative ele...

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Abstract

The invention discloses sulfur-doped carbon nanowires, and a three-dimensional sulfur-doped carbon nanowire network-silicon composite material and a preparation method thereof. The invention discloses a preparation method of a sulfur-doped carbon nanowire lithium ion battery anode material. In the method, sulfur-containing polymer nanowires are prepared with a soft template method, and the sulfur-doped carbon nanowires are prepared through further carbonization. Through doping of carbon into sulfur, the first-time coulombic efficiency of the carbon nanowires serving as the lithium ion battery anode material is increased effectively. Moreover, silicon particles are added into a sulfur-containing polymer nanowire reaction system prepared with the soft template method in order to prepare a composite material in which carbon particles are embedded into a three-dimensional sulfur polymer nanowire network, and high-temperature carbonization is performed to obtain a three-dimensional sulfur-doped carbon nanowire network-silicon composite material. The composite anode material has the advantages of high specific capacity, high cyclic stability and the like, and a novel effective path is provided for the research and development of high-performance lithium ion battery anode materials.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery, in particular to a preparation method of a composite lithium ion battery negative electrode material of a sulfur-doped carbon nanowire and its three-dimensional network and silicon. Background technique [0002] Carbon materials have played an important role in the development of human civilization, and the diversity of their forms and properties has attracted the attention of scholars at home and abroad. In the past 20 years, carbon nanowire materials have become a research hotspot due to their superior mechanical, electrical and chemical properties and have been widely used in many fields such as energy, materials, astronomy, environmental protection, microelectronics, semiconductors, aerospace, biomedicine, and chemical engineering. , and penetrate into various emerging industries, there is a huge application prospect. However, when carbon nanowire materials are used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/38B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 张灵志邵丹唐道平
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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