Graphene/stannous oxide two-dimensional heterojunction composite material and preparation method thereof

A two-dimensional heterojunction and stannous oxide technology, applied in graphene, secondary batteries, structural parts, etc., can solve the problems of lithium consumption, fast capacity decay, and low volume-to-volume specific capacity, and achieve reduced capacity decay and reduced The effect of small specific surface area and simple operation

Active Publication Date: 2019-01-25
深圳市普利司德高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when applied to lithium-ion batteries, due to the large specific surface area of ​​graphene, the SEI film formed

Method used

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  • Graphene/stannous oxide two-dimensional heterojunction composite material and preparation method thereof
  • Graphene/stannous oxide two-dimensional heterojunction composite material and preparation method thereof
  • Graphene/stannous oxide two-dimensional heterojunction composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0057] This embodiment provides a graphene / stannous oxide two-dimensional heterojunction composite material and a preparation method thereof. Stir and mix concentrated sulfuric acid and oleum at room temperature, and add ammonium persulfate and stir for 5 minutes after cooling to room temperature; Add graphite powder for reaction, react for 40 minutes; perform water bath reaction at 75°C, and ultrasonicate for 3 minutes every water bath reaction for 15 minutes, repeat three times; dilute with deionized water; wash with deionized water; freeze-dry to obtain graphene nanosheets. The graphene is uniformly dispersed in water. Use the isopropanol aqueous solution of 20% by volume fraction as the dispersed phase to prepare the dispersion of stannous oxide, the concentration of the dispersion is 1mg / ml; centrifuge after 10 hours of ultrasonic at room temperature, get the supernatant as the stannous oxide nanosheet The dispersion liquid and the precipitate (unstripped stannous oxide) ...

Embodiment 2

[0060] This embodiment provides a graphene / stannous oxide two-dimensional heterojunction composite material and a preparation method thereof. Stir and mix concentrated sulfuric acid and oleum at room temperature, add ammonium persulfate and stir for 15 minutes after cooling to room temperature; Add graphite powder for reaction, react for 80 minutes; perform water bath reaction at 85° C., sonicate for 10 minutes per water bath reaction, repeat three times; dilute with deionized water; wash with deionized water; freeze-dry to obtain graphene nanosheets. The graphene is uniformly dispersed in water. Use the isopropanol aqueous solution of 40% by volume fraction as the dispersed phase to prepare the dispersion of stannous oxide, the concentration of the dispersion is 1mg / ml; centrifuge after 14 hours of ultrasonication at room temperature, and get the supernatant as the stannous oxide nanosheet The dispersion liquid and the precipitate (unstripped stannous oxide) can be re-dispers...

Embodiment 3

[0063] This embodiment provides a graphene / stannous oxide two-dimensional heterojunction composite material and a preparation method thereof. Stir and mix concentrated sulfuric acid and oleum at room temperature, and add ammonium persulfate after cooling to room temperature and stir for 10 minutes; Add graphite powder for reaction, react for 60 minutes; perform water bath reaction at 80°C, and ultrasonicate for 5 minutes for each water bath reaction for 30 minutes, repeat three times; dilute with deionized water; wash with deionized water; freeze-dry to obtain graphene nanosheets. The graphene is uniformly dispersed in water. Use the isopropanol aqueous solution of 30% by volume fraction as the dispersed phase to prepare the dispersion of stannous oxide, the concentration of the dispersion is 1mg / ml; centrifuge after ultrasonic at room temperature for 12 hours, get the supernatant as the stannous oxide nanosheet The dispersion liquid and the precipitate (unstripped stannous ox...

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Abstract

The invention discloses a graphene/stannous oxide two-dimensional heterojunction composite material, a preparation method and a use thereof, belonging to the technical field of lithium ion battery materials, wherein the composite material is composed of graphene nanosheets and stannous oxide nanosheets through layer-by-layer assembly and composite; 20 to 95 percent of graphene nano sheet and 80 to5 percent of stannous oxide nano sheet in that composite material. The invention aims at peeling off graphene and SnO nanosheets from cheap and easily available graphite and stannous oxide minerals,constructing two-dimensional synergistic action between graphene and stannous oxide nanosheets, and preparing graphene/SnO two-dimensional nanoheterojunction composite material; A novel cathode material for lithium ion batteries with high capacity and long lifetime was obtained by enhancing the electron transport pathway in the electrode reaction and buffering the volume expansion of the materialduring the charge-discharge process of lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a graphene / stannous oxide two-dimensional heterojunction composite material and its preparation method and application. Background technique [0002] In recent years, lithium secondary batteries have been widely used in many fields such as mobile electronic equipment and new energy vehicles due to their excellent performance. With the increasingly severe energy and environmental problems, the development of the new energy industry has also put forward higher requirements for the performance of lithium-ion batteries: the existing battery materials and device systems can no longer meet the growing demand for high capacity and long life. Graphite is a commonly used negative electrode material for commercial lithium batteries, and its theoretical specific capacity is only 372mAh / g. Research on materials that can replace graphite as negative electrode...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M10/0525C01B32/182
CPCC01B32/182H01M4/362H01M4/48H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 刘慰江品娴李森陈云贵
Owner 深圳市普利司德高分子材料有限公司
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