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A kind of preparation method of carbon-coated silicon and zinc oxide composite electrode material

A composite electrode, zinc oxide technology, used in battery electrodes, circuits, electrical components, etc., to achieve good cycle stability, high capacity, and good electrochemical performance.

Active Publication Date: 2021-01-19
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a large gap between the capacity of the composite structure of porous carbon and nano-zinc oxide and the theoretical capacity of zinc oxide (978mAh / g)

Method used

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  • A kind of preparation method of carbon-coated silicon and zinc oxide composite electrode material
  • A kind of preparation method of carbon-coated silicon and zinc oxide composite electrode material
  • A kind of preparation method of carbon-coated silicon and zinc oxide composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 Preparation of carbon-coated silicon and zinc oxide composite electrode material

[0029] Soak the sunflower stalk sponge tissue in water, place it in a polytetrafluoroethylene-lined autoclave, heat it at 180°C for 24 hours, cool it down to room temperature naturally, take out the reaction product, and dry it to obtain a carbon precursor. The mass ratio with KOH is 1: 2 Make a mixed solution, let it stand for 6 hours, and then dry it at 60°C;

[0030] The dried product was placed in a tube furnace, annealed at 700 °C for 2 h under an argon atmosphere, and the heating rate was 5 °C min- 1 ;

[0031] Treat the sintered powder with excess dilute hydrochloric acid, wash with distilled water until neutral, and obtain a porous carbon material after drying;

[0032] 0.44g Zn(AC) 2 2H 2 O (2.4mmol), 0.72g CTAB (2mmol), 0.2g NaOH (4mmol) and 0.268ml EDA (1mmol) were respectively dissolved in 40ml of ethanol solution;

[0033] Add CTAB, NaOH and EDA ethanol solu...

Embodiment 2

[0039] Embodiment 2: Preparation of carbon-coated zinc oxide composite material (no silicon)

[0040]Soak the sunflower stalk sponge tissue in water, place it in a polytetrafluoroethylene-lined autoclave, heat it at 180°C for 24 hours, cool it down to room temperature naturally, take out the reaction product, and dry it to obtain a carbon precursor. The mass ratio with KOH is 1: 2 Make a mixed solution, let it stand for 6 hours, and then dry it at 60°C;

[0041] The dried product was placed in a tube furnace, annealed at 700 °C for 2 h under an argon atmosphere, and the heating rate was 5 °C min- 1 ;

[0042] Treat the sintered powder with excess dilute hydrochloric acid, wash with distilled water until neutral, and obtain a porous carbon material after drying;

[0043] 0.44g Zn(AC) 2 2H 2 0.0.72g CTAB (cetyltrimethylammonium bromide), 0.2g NaOH and 0.268ml EDA (ethylenediamine) are dissolved in the ethanol solution of 40ml respectively;

[0044] Add CTAB, NaOH and EDA et...

Embodiment 3

[0049] Embodiment 3: Making the negative electrode of lithium ion battery with carbon-coated silicon and zinc oxide composite material.

[0050] The lithium-ion battery negative electrode is composed of 80wt% carbon-coated silicon and zinc oxide composite material (active material), 10wt% binder (polyvinylidene fluoride, PVDF) and 10wt% conductive agent carbon black. The three were mixed and ground for 0.5h, then put into a container, and a certain amount of 1-methyl-2-pyrrolidone (NMP, solvent) was added into the container, and then placed on a magnetic stirrer and stirred at a constant speed for 6h, so that the mixture became a viscous fluid. Copper foil is used as a current collector, and the above-mentioned mixed viscous material is coated on the copper foil, and the coating density must be uniform. The temperature of the vacuum drying oven was set at 120° C., and the above-mentioned copper foil smear was taken and placed in the drying oven. After timing for 12 hours, it w...

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Abstract

The invention discloses a preparation method for a carbon-coated silicon and zinc oxide composite electrode material, which belongs to the technical field of lithium ion battery negative electrode materials. The method mainly comprises the following steps of: sequentially dropwise adding ethanol solutions of CTAB, NaOH and EDA into an ethanol solution of Zn(AC)2.2H2O while stirring to form a faintyellow precipitate, adding SiO and porous carbon, continuing to stir for 30 minutes, heating for 8 hours, etching and washing the precipitate with ammonia water until the precipitate is neutral, drying to obtain solid powder, and annealing and grinding the powder. The prepared novel composite material has good electrochemical performance, and the lithium ion battery negative electrode prepared from the novel composite material has good cycling stability and relatively high capacity.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery negative electrode materials, and relates to a carbon-coated silicon and zinc oxide composite electrode material and a preparation method thereof. Background technique [0002] With the increasing demand for developing green and high-efficiency energy sources, Li-ion batteries with high energy density and long cycle life have become one of the most important devices for efficient energy storage and conversion. It is of great significance to select a new type of anode with high capacity to replace conventional graphite (theoretical capacity 372mAh / g) to improve the performance of lithium-ion batteries. Zinc oxide is a multifunctional material with a high theoretical capacity (978mAh / g) and a high diffusion coefficient of lithium ions, so it has attracted much attention. However, the drastic volume change and low electronic conductivity during charging and discharging lead to poor cycle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 李红东孙小晨刘钧松高楠王启亮成绍恒
Owner JILIN UNIV
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