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A preparation method of a three-dimensional porous tin oxide graphene composite electrode material

A technology of graphene composite and electrode materials, applied in the direction of nanotechnology, negative electrodes, battery electrodes, etc. for materials and surface science

Active Publication Date: 2021-05-04
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when using SnO 2 Achieving high-rate performance of rechargeable Li-ion batteries with their excellent cycling performance remains a major challenge when used as an anode

Method used

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  • A preparation method of a three-dimensional porous tin oxide graphene composite electrode material
  • A preparation method of a three-dimensional porous tin oxide graphene composite electrode material
  • A preparation method of a three-dimensional porous tin oxide graphene composite electrode material

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Experimental program
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Effect test

Embodiment 1

[0034] Preparation method of three-dimensional porous tin oxide graphene composite electrode material with low tin dioxide loading

[0035] In the first step, take 0.188g glycine and 183uL concentrated HCl at room temperature and add it to a mixed solution of 8ml deionized water and 42ml ethylene glycol to prepare a glycine-ammonium hydrochloride standard buffer solution (alcoholic water system) with a pH of 2.2, and stir for 15min. Ultrasound for 10 minutes to obtain 50ml of colorless and transparent solution mixed uniformly;

[0036] In the second step, 5 mg of graphene oxide was added to the solution obtained in the first step, and stirred at room temperature for 15 minutes to obtain a brownish-yellow transparent solution;

[0037] In the third step, 0.25 mmol tin tetrachloride pentahydrate was added to the brownish-yellow transparent solution obtained in the second step, and stirred at room temperature for 15 minutes to obtain a brownish-yellow transparent solution;

[00...

Embodiment 2

[0043] Preparation method of three-dimensional porous tin oxide graphene composite electrode material with medium tin dioxide loading

[0044] In the first step, take 0.188g glycine and 183uL concentrated HCl at room temperature and add it to a mixed solution of 8ml deionized water and 42ml ethylene glycol to prepare a glycine-ammonium hydrochloride standard buffer solution (alcoholic water system) with a pH of 2.2, and stir for 15min. Ultrasound for 10 minutes to obtain 50ml of colorless and transparent solution mixed uniformly;

[0045] In the second step, 5 mg of graphene oxide was added to the solution obtained in the first step, and stirred at room temperature for 15 minutes to obtain a brownish-yellow transparent solution;

[0046] In the third step, 0.375 mmol tin tetrachloride pentahydrate was added to the brownish-yellow transparent solution obtained in the second step, and stirred at room temperature for 15 minutes to obtain a brownish-yellow transparent solution;

...

Embodiment 3

[0052] Preparation method of three-dimensional porous tin oxide graphene composite electrode material with high tin dioxide loading

[0053] In the first step, take 0.188g glycine and 183uL concentrated HCl at room temperature and add it to a mixed solution of 8ml deionized water and 42ml ethylene glycol to prepare a glycine-ammonium hydrochloride standard buffer solution (alcoholic water system) with a pH of 2.2, and stir for 15min. Ultrasound for 10 minutes to obtain 50ml of colorless and transparent solution mixed uniformly;

[0054] In the second step, 5 mg of graphene oxide was added to the solution obtained in the first step, and stirred at room temperature for 15 minutes to obtain a brownish-yellow transparent solution;

[0055] In the third step, 0.5 mmol tin tetrachloride pentahydrate was added to the brownish-yellow transparent solution obtained in the second step, and stirred at room temperature for 15 minutes to obtain a brownish-yellow transparent solution;

[00...

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Abstract

A method for preparing a three-dimensional porous tin oxide-graphene composite electrode material is simple and convenient, and the three-dimensional porous tin oxide-graphene composite electrode material can be prepared. The specific steps are: (1) prepare a buffer solution with target pH at room temperature, add an appropriate amount of tin tetrachloride pentahydrate and graphene oxide, stir vigorously until uniformly dispersed, and form a yellow transparent solution; (2) heat the mixed solution to 60-80°C, react for 2-6h under stirring conditions, cool down naturally and centrifuge to wash to obtain a brownish-yellow / black precipitate; (3) Transfer 20-40mg of the obtained brownish-yellow / black precipitate into a 5-20mL polytetrafluoroethylene Add pure water to a reaction kettle of ethylene, stir, and react at 180°C for 24-48h after stirring to obtain a black gel-like sample, which is transferred to a freeze dryer and dried for 24-48h to obtain a dry Black block; (3) transfer the dried black block into a tube furnace, and calcinate at 650°C for 4‑6h under the protection of argon to obtain a three-dimensional porous tin oxide graphene composite electrode material.

Description

technical field [0001] The invention relates to the field of new energy technology, in particular to a preparation method of a three-dimensional porous tin oxide graphene composite electrode material. Background technique [0002] With the rapid development of economy and technology, people must face the global energy crisis and serious environmental pollution brought about by their rapid development while enjoying the convenience they bring. Finding clean, efficient and sustainable new energy sources is one of the most important challenges facing people today. Rechargeable secondary batteries, as "porters" that bring energy to practical applications in people's lives, have also received widespread attention in recent years. [0003] At present, rechargeable lithium-ion batteries have been widely studied due to their high voltage, high specific energy, good safety performance, long cycle life, and fast charge and discharge. Rechargeable lithium-ion batteries have high oper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/48H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/483H01M4/587H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 郭林赵赫威曾小龙
Owner BEIHANG UNIV