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Method for preparing graphene-based hollow tin dioxide lithium ion battery negative electrode material

A lithium-ion battery and tin dioxide technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problems of high pollution, cumbersome operation process, etc., achieve high specific surface area, increase storage Space, the effect of improving specific capacity and cycle stability

Inactive Publication Date: 2015-05-06
LUDONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the removal of the template is involved, and the treatment liquid is a highly corrosive liquid, the operation process of this method is cumbersome and polluting

Method used

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  • Method for preparing graphene-based hollow tin dioxide lithium ion battery negative electrode material
  • Method for preparing graphene-based hollow tin dioxide lithium ion battery negative electrode material
  • Method for preparing graphene-based hollow tin dioxide lithium ion battery negative electrode material

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Embodiment 1

[0031] A preparation method of a graphene-based hollow tin dioxide lithium-ion battery negative electrode material, the steps are as follows:

[0032] (1) Add 1.0 parts by weight of graphene oxide to a mixed solvent composed of 900 parts by weight of ethanol and 1900 parts by weight of deionized water, and ultrasonically vibrate for 10 minutes to obtain a stable graphene oxide dispersion;

[0033] (2) Add 13 parts by weight of potassium stannate trihydrate in the graphene oxide dispersion of step (1), after stirring for 5 minutes, add 18 parts by weight of urea, and continue stirring for 5 minutes;

[0034] (3) Transfer the mixed solution of step (2) into a high-pressure reactor, place it in an oven and heat it at 150°C for 24 hours. After the reaction, the product obtained is washed 5 times with deionized water to obtain a graphene oxide-based hollow dioxide tin composite materials;

[0035] (4) Disperse the graphene oxide-based hollow tin dioxide composite material in step ...

Embodiment 2

[0041] A preparation method of a graphene-based hollow tin dioxide lithium-ion battery negative electrode material, the steps are as follows:

[0042] (1) Add 0.6 parts by weight of graphene oxide to a mixed solvent composed of 1000 parts by weight of ethanol and 1800 parts by weight of deionized water, and ultrasonically vibrate for 10 minutes to obtain a stable graphene oxide dispersion;

[0043] (2) Add 15 parts by weight of sodium stannate trihydrate in the graphene oxide dispersion of step (1), after stirring for 3min, add 20 parts by weight of urea, and continue stirring for 5min;

[0044] (3) Transfer the mixed solution of step (2) into a high-pressure reactor, place it in an oven and heat it at 180°C for 24 hours. After the reaction, the product obtained is washed 5 times with deionized water to obtain a graphene oxide-based hollow dioxide tin composite materials;

[0045] (4) Disperse the graphene oxide-based hollow tin dioxide composite material of step (3) in 100 p...

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Abstract

The invention belongs to the field of lithium ion batteries and in particular relates to a method for preparing a graphene-based hollow tin dioxide lithium ion battery negative electrode material. According to the graphene-based hollow tin dioxide lithium ion battery negative electrode material prepared by the method disclosed by the invention, the hollow structure can provide a full buffer space for the volume change in the charge-discharge cycle process, and the lithium-ion storage space is increased. Meanwhile, the hollow tin dioxide has high specific surface area, the reaction sites can be increased, the lithium ion diffusion distance is reduced, and the specific capacity and cycle performance of the electrode material are improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a graphene-based hollow tin dioxide lithium ion battery negative electrode material. Background technique [0002] As a new type of rechargeable power source, lithium-ion batteries have the advantages of high working voltage, high energy density, low self-discharge rate, safety and pollution-free, etc., and have been widely used in portable electronic devices such as mobile phones and notebook computers. At present, commercialized lithium-ion batteries mainly use graphite or modified graphite as the negative electrode material, and its theoretical maximum lithium intercalation capacity is only 372mAh / g. After years of optimization, the performance has reached the limit. In order to meet the needs of high specific energy lithium-ion batteries, it has become a research and development hotspot at home and abroad to find graphite alternative ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48
CPCB82Y30/00B82Y40/00H01M4/139H01M4/362H01M4/483H01M4/625Y02E60/10
Inventor 杨正龙姜玮赵书平蒙延峰王莉莉钱敏雪潘靖恺刘娟
Owner LUDONG UNIVERSITY
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