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A kind of preparation method of graphene/titanium dioxide composite material for negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of metal oxide negative electrode materials that are difficult to get practical application, loss of electrical contact between ions, electrode cracks and brittleness, etc., to achieve enhanced Cyclic reversible lithium storage capacity, large electrochemical lithium storage capacity, and the effect of alleviating large volume expansion

Active Publication Date: 2016-01-27
SHENZHEN XIANGFENGHUA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the alloying / dealloying process of such anode materials with lithium, the metal matrix may undergo large changes in both structure and volume, and at the same time, the mechanical pressure associated with volume changes can cause its mechanical stability. Rapid decay, causing cracks and brittleness in the electrode, resulting in the loss of electrical contact between ions, and eventually leading to a rapid decline in its cycle performance
Therefore, high-capacity lithium alloy and metal oxide anode materials are still difficult to obtain practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A kind of preparation method of graphene / titanium dioxide composite material for negative electrode material of lithium ion battery, comprises the steps:

[0018] a. Preparation of graphite oxide nanosheets

[0019] Dissolve a certain amount of potassium persulfate and phosphorus pentoxide in concentrated sulfuric acid, add a certain amount of natural graphite after heating to 80°C, keep warm at 80°C for 4.5h, and then cool to room temperature; then dilute with deionized water and place Overnight; then filter and wash, and dry the obtained filter residue in a vacuum oven at 60°C; dissolve the dried filter residue in concentrated sulfuric acid, slowly add potassium permanganate in an ice bath, and stir at 35°C for 2 hours then dilute with deionized water, and slowly add 30% hydrogen peroxide; filter and wash; disperse the washed product in deionized water, and ultrasonically peel off to obtain graphite oxide nanosheets, which are centrifuged and dried for use;

[0020] ...

Embodiment 2

[0026] A kind of preparation method of graphene / titanium dioxide composite material for negative electrode material of lithium ion battery, comprises the steps:

[0027] a. Preparation of graphite oxide nanosheets

[0028] Dissolve a certain amount of potassium persulfate and phosphorus pentoxide in concentrated sulfuric acid, add a certain amount of natural graphite after heating to 80°C, keep warm at 80°C for 4.5h, and then cool to room temperature; then dilute with deionized water and place Overnight; then filter and wash, and dry the obtained filter residue in a vacuum oven at 60°C; dissolve the dried filter residue in concentrated sulfuric acid, slowly add potassium permanganate in an ice bath, and stir at 35°C for 2 hours then dilute with deionized water, and slowly add 30% hydrogen peroxide; filter and wash; disperse the washed product in deionized water, and ultrasonically peel off to obtain graphite oxide nanosheets, which are centrifuged and dried for use;

[0029] ...

Embodiment 3

[0035] A kind of preparation method of graphene / titanium dioxide composite material for negative electrode material of lithium ion battery, comprises the steps:

[0036] a. Preparation of graphite oxide nanosheets

[0037]Dissolve a certain amount of potassium persulfate and phosphorus pentoxide in concentrated sulfuric acid, add a certain amount of natural graphite after heating to 80°C, keep warm at 80°C for 4.5h, and then cool to room temperature; then dilute with deionized water and place Overnight; then filter and wash, and dry the obtained filter residue in a vacuum oven at 60°C; dissolve the dried filter residue in concentrated sulfuric acid, slowly add potassium permanganate in an ice bath, and stir at 35°C for 2 hours then dilute with deionized water, and slowly add 30% hydrogen peroxide; filter and wash; disperse the washed product in deionized water, and ultrasonically peel off to obtain graphite oxide nanosheets, which are centrifuged and dried for use;

[0038] b...

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PUM

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Abstract

The invention discloses a preparation method of a graphene / titanium dioxide composite material for a lithium ion battery cathode material. The preparation method comprises the following steps: a, preparing a graphite oxide nanosheet; b, preparing the graphene / titanium dioxide composite material; and c, mixing and transferring the components in the step b to a hydrothermal high pressure reaction kettle for reaction. The method for preparing graphene / titanium dioxide composite material disclosed by the invention has the advantages of simple process, mild condition, low cost and the like. Through optimized design of the preparation process and formula of the composite material, the graphene / titanium dioxide composite material prepared by the method has good conductivity, large electrochemical lithium storage capacity, high energy density and good cycle performance. According to the graphene / titanium dioxide composite material prepared in the hydrothermal high pressure reaction kettle, not only greatly alleviating bulk mass expansion of a metal oxide cathode in the lithium storage process, but also greatly enhancing the circular and reversible lithium storage ability of the metal oxide cathode.

Description

technical field [0001] The invention relates to the technology in the field of lithium batteries, and in particular provides a method for preparing a graphene / titanium dioxide composite material for lithium ion battery anode materials. Background technique [0002] Due to its high energy density and good cycle performance, lithium-ion batteries have been widely used and gradually replaced traditional chemical power sources such as lead-acid batteries in many fields. Especially with the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. The hybrid electric vehicle and electric vehicle industries are developing rapidly, and lithium-ion batteries are widely used as an important energy storage device. [0003] At present, graphite is the main anode material for commercial lithium-ion batteries. Due to the low cost and wide sources of graphite, it is suitable for commercialization, but its capacity is low, with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/483H01M4/625Y02E60/10
Inventor 赵东辉戴涛周鹏伟
Owner SHENZHEN XIANGFENGHUA TECH CO LTD