Preparation method of graphene coated silica nanotube composite negative electrode material for lithium ion battery

A graphene coating and nanotube composite technology, which can be used in battery electrodes, secondary batteries, electrochemical generators, etc., and can solve problems such as limiting silica anode materials.

Inactive Publication Date: 2014-11-19
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of graphene-silica composite nanomaterials, especially graphene-coated silica nanotubes, still faces great challenges, which limits the ability to obtain high-performance bicarbonate through nanostructure design and graphene modification. Silicon oxide negative electrode material

Method used

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  • Preparation method of graphene coated silica nanotube composite negative electrode material for lithium ion battery
  • Preparation method of graphene coated silica nanotube composite negative electrode material for lithium ion battery
  • Preparation method of graphene coated silica nanotube composite negative electrode material for lithium ion battery

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Embodiment 1

[0029] A preparation method of a graphene-coated silicon dioxide nanotube composite negative electrode material for a lithium ion battery, the steps are as follows:

[0030] (1) Disperse 0.1 gram of zinc oxide nanorods in 120 milliliters of ethanol solution, then add 20 milliliters of water, 20 milliliters of ammonia and 60 microliters of tetraethyl orthosilicate solution successively, react at room temperature for 1 hour, wash and dry the product, Obtain zinc oxide / silica core-shell nanorods;

[0031] (2) Disperse 0.6 gram of the product obtained in step (1) into 60 milliliters of 0.5 mol / liter sodium chloride aqueous solution, add 0.15 gram of positively charged polydiallyldimethylammonium chloride, and stir for 1 hour , the product is washed and dried to obtain zinc oxide / silica core-shell nanorods modified by polydiallyldimethylammonium chloride;

[0032] (3) Disperse 0.6 gram of the product obtained in step (2) and 0.2 gram of graphene oxide into 50 milliliters of aqueou...

Embodiment 2

[0037] A preparation method of a graphene-coated silicon dioxide nanotube composite negative electrode material for a lithium ion battery, the steps are as follows:

[0038] (1) Disperse 0.01 gram of zinc oxide nanorods in 1000 milliliters of ethanol solution, then add 100 milliliters of water, 100 milliliters of ammonia and 50 microliters of tetraethyl orthosilicate solution successively, react at room temperature for 0.5 hours, wash and dry the product, Obtain zinc oxide / silica core-shell nanorods;

[0039] (2) Disperse the product obtained by 0.06 gram of step (1) into 20 milliliters of 0.5 mol / liter sodium chloride aqueous solution, add 0.6 gram of positively charged polydiallyl dimethyl ammonium chloride, stir for 24 hours , the product is washed and dried to obtain zinc oxide / silica core-shell nanorods modified by polydiallyldimethylammonium chloride;

[0040] (3) 0.06 gram of the product obtained in step (2) and 0.3 gram of graphene oxide were dispersed in 50 milliliters...

Embodiment 3

[0044] A preparation method of a graphene-coated silicon dioxide nanotube composite negative electrode material for a lithium ion battery, the steps are as follows:

[0045] (1) Disperse 0.01 gram of zinc oxide nanorods in 120 milliliters of ethanol solution, then add 35 milliliters of water, 35 milliliters of ammonia and 30 microliters of tetraethyl orthosilicate solution successively, react at room temperature for 4 hours, wash and dry the product, Obtain zinc oxide / silica core-shell nanorods;

[0046] (2) Disperse 0.06 gram of the product obtained in step (1) into 200 milliliters of 0.5 mol / liter sodium chloride aqueous solution, add 0.06 gram of positively charged polydiallyldimethylammonium chloride, and stir for 12 hours , the product is washed and dried to obtain zinc oxide / silica core-shell nanorods modified by polydiallyldimethylammonium chloride;

[0047] (3) Disperse 0.06 gram of the product obtained in step (2) and 0.06 gram of graphene oxide into 50 milliliters o...

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Abstract

A preparation method of graphene coated silica nanotube composite negative electrode material for lithium ion batteries is as follows: (1) dispersing zinc oxide nanorods to an ethanol solution, sequentially adding water, ammonia water and a TEOS solution to obtain zinc oxide / silica core-shell nanorods; (2) dispersing the products from the step (1) in to an aqueous solution of sodium chloride, and adding PDDA for modification; (3) dispersing the products from the step (2) and the graphene oxide into an aqueous solution, dropwise adding sodium borohydride to obtain graphene coated zinc oxide / silica core-shell nanorods; and (4) dispersing the products obtained from the step (3) in an excessive amount of acid solution to dissolve zinc oxide nanorods, so as to obtain the composite negative electrode material. According to the invention, zinc oxide nanorods are used as templates, and coated by silicon dioxide and graphene, and then the template is removed, so as to prepare the graphene coated silica nanotube composite material. The prepared composite material has the performances of high discharge capacity, long cycle life and high rate capability.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery negative electrode material, in particular to a preparation method of a graphene-coated silicon dioxide nanotube composite negative electrode material. Background technique [0002] Silicon-based materials such as elemental silicon, silicon-based alloys, and silicon oxides have high theoretical specific capacity and good safety, and can be used as ideal substitutes for commercial carbon anode materials for lithium-ion batteries. Among them, silicon oxide, especially silicon dioxide, has the advantages of simple preparation, low cost and environmental friendliness, and has become one of the research hotspots of silicon-based anode materials. However, the huge volume change of silica materials during the process of lithium intercalation and deintercalation will lead to pulverization of electrode materials, loss of electrical contact, and rapid loss of specific capacity. In addition, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1393H01M4/1391
CPCH01M4/366H01M4/48H01M4/625H01M10/0525Y02E60/10
Inventor 吴平王惠于梓洹周益明唐亚文陆天虹
Owner NANJING NORMAL UNIVERSITY
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