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Preparation method of graphene/silicon/conducting polymer composite anode material

A technology of conductive polymer and negative electrode material, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of capacity decay, weak binding force, silicon detachment, etc., to alleviate the volume effect and improve the energy density and power density.

Active Publication Date: 2016-05-04
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene and silicon are only mechanically combined, and the binding force is weak. After many cycles, silicon is easily detached from the graphene matrix, resulting in its capacity decay

Method used

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  • Preparation method of graphene/silicon/conducting polymer composite anode material
  • Preparation method of graphene/silicon/conducting polymer composite anode material
  • Preparation method of graphene/silicon/conducting polymer composite anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Graphene / silicon / conductive polymer foam composite flexible electrode material Ⅰ

[0022] Cool concentrated sulfuric acid to 0°C, then add graphite and sodium nitrate, stir until uniform, gradually and continuously add potassium permanganate, stir for 3 hours, raise the temperature to 35°C, continue stirring for 0.5h, then gradually and continuously add deionized water, the temperature rose to 98°C, reacted at this temperature for 15 minutes, moved to room temperature, added 10% hydrogen peroxide, stirred for 1 hour, then added 1M hydrochloric acid and mixed and stirred, and the obtained product was washed with deionized water until it was neutral, and the oxidized graphite. Graphite oxide was dispersed in deionized water at a concentration of 2 mg / mL, and ultrasonically exfoliated to obtain graphene oxide materials. Mix graphene oxide, nano-silica powder and aniline monomer in proportion (respectively accounting for 35%, 45%, and 20% of the total mass ratio of the com...

Embodiment 2

[0024] Graphene / silicon / conductive polymer foam composite flexible electrode material Ⅱ

[0025] Prepare graphene oxide material as described in Example 1, graphene oxide, nano silicon powder and aniline monomer are mixed in proportion (respectively accounting for composite material gross mass ratio is 40%, 50%, 10%) mix uniformly, then Add an appropriate amount of 1molL -1 Sonicate dilute hydrochloric acid, then slowly add an equal volume of 0.5molL -1 Ammonium persulfate was reacted for 6 hours to obtain a graphene oxide / silicon / conductive polymer composite material, and then dried at 60° C. for 12 hours to obtain a graphene oxide / silicon / conductive polymer film composite material. The prepared thin film composite material was reduced in hydrazine hydrate vapor at 80°C for 0.5h, and finally the graphene oxide / silicon / conductive polymer composite flexible electrode material II was obtained. The test conditions of the electrode material are as described in Example 1, charge ...

Embodiment 3

[0027] Graphene / silicon / conductive polymer foam composite flexible electrode materialsⅢ

[0028] Prepare graphene oxide material as described in Example 1, graphene oxide, nano-silica powder and aniline monomer are mixed in proportion (respectively accounting for 50%, 45%, 5% of the total mass ratio of composite material), and then Add an appropriate amount of 1molL -1 Sonicate dilute hydrochloric acid, then slowly add an equal volume of 0.5molL -1Ammonium persulfate was reacted for 6 hours to obtain a graphene oxide / silicon / conductive polymer composite material, and then dried at 60° C. for 12 hours to obtain a graphene oxide / silicon / conductive polymer film composite material. The prepared thin film composite material was reduced in hydrazine hydrate vapor at 120°C for 2 hours, and finally the graphene oxide / silicon / conductive polymer composite flexible electrode material III was obtained. The test conditions of the electrode material are as described in Example 1, charge a...

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Abstract

The invention discloses a preparation method of a graphene / silicon / conducting polymer composite anode material, belonging to the field of electrochemistry and new energy materials. The preparation method disclosed by the invention comprises the following steps of preparing a graphene oxide material at first, mixing graphene oxide with silicon powder and a polymer monomer, polymerizing the polymer monomer under a certain condition, then, directly drying to obtain a graphene oxide / silicon / conducting polymer film composite material, and then, preparing a graphene / silicon / conducting polymer foam composite material by adopting a hydrazine hydrate steam reduction method. The foam material provided by the invention has good flexibility and is applied to manufacturing a flexible electrode. The material prepared by the invention is used as the anode material of a lithium ion battery; any auxiliary is unnecessary to add; a metal substrate is also unnecessary to use; and the material has good cycling stability and the relatively high specific capacity.

Description

technical field [0001] The invention belongs to the field of electrochemistry and new energy materials, and in particular relates to a preparation method of a graphene / silicon / conductive polymer composite negative electrode material. Background technique [0002] Lithium-ion batteries are considered to be the representative of the next generation of new energy batteries due to their outstanding advantages such as high working voltage, high energy density, long cycle life, small self-discharge, and no memory effect. Anode materials are an important part of lithium-ion batteries. Silicon has the highest theoretical capacity (4200mAhg -1 ), but its cycle stability is poor, which is mainly due to the structural damage caused by the volume expansion of silicon materials during charge and discharge. In order to improve the cycle stability of silicon materials, the modification methods currently used mainly include carbon coating, doping and preparation of nanoporous silicon mate...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/60
CPCH01M4/364H01M4/386H01M4/602Y02E60/10
Inventor 陶华超朱守超杨学林熊凌云
Owner CHINA THREE GORGES UNIV
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