Graphene/titanium dioxide lithium ion battery cathode material and preparation method

A lithium-ion battery and titanium dioxide technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., to achieve the effects of improving electronic conductivity, improving cycle stability, and simple preparation process

Inactive Publication Date: 2011-01-05
UNIV OF SCI & TECH BEIJING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The graphene/titanium dioxide composite material prepared by the method of in-situ compounding is a kind of lithium-ion battery

Method used

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  • Graphene/titanium dioxide lithium ion battery cathode material and preparation method
  • Graphene/titanium dioxide lithium ion battery cathode material and preparation method
  • Graphene/titanium dioxide lithium ion battery cathode material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: Lithium-ion battery negative electrode material graphene / titanium dioxide composite material I

[0030] 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 5% 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 0.5 mg / mL, and ultrasonically exfoliated to obtain graphene oxide. Graphene oxide was reduced by hydrazine at 100°C for 24 hours, and the obtained product was washed with deionized water until neutral t...

Embodiment 2

[0031] Embodiment 2: Lithium-ion battery negative electrode material graphene / titanium dioxide composite material II

[0032]The graphene oxide material was prepared as described in Example 1. Graphene oxide and titanium tetrachloride were uniformly mixed in a mass ratio of 1:10, then hydrolyzed at 60°C for 3 hours, and the product was washed and filtered to obtain oxidized Graphene and titanium dioxide composites. The prepared composite material was dispersed in a hydrazine solution, and kept at a temperature of 100° C. for 24 hours, the product was washed to neutrality, and finally the graphene / titanium dioxide composite material II was obtained. The electrode material test conditions are as described in Example 1, with a current density of 50mA / g charging and discharging, the first discharge capacity can reach 350mAh / g, and the capacity after 50 cycles is also 280mAh / g.

Embodiment 3

[0033] Embodiment 3: Lithium-ion battery negative electrode material graphene / titanium dioxide composite material III

[0034] The graphene oxide material was prepared as described in Example 1. Graphene oxide and titanium tetrachloride were uniformly mixed in a mass ratio of 1:20, then hydrolyzed at 60°C for 3 hours, and the product was washed and filtered to obtain oxidized Graphene and titanium dioxide composites. The prepared composite material was dispersed in a hydrazine solution, and kept at a temperature of 100° C. for 24 hours, the product was washed to neutrality, and finally the graphene / titanium dioxide composite material III was obtained. The transmission electron microscope photograph of the electrode material is as follows: Figure 6 shown. The electrode material test conditions are as described in Example 1, with the current density of 50mA / g charging and discharging, the first discharge capacity can reach 320mAh / g, and the capacity after 50 cycles is also 25...

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Abstract

The invention discloses a graphene/titanium dioxide lithium ion battery cathode material and a preparation method, and belongs to the field of electrochemistry and new energy materials. The method comprises the following steps of: oxidizing graphite powder into graphite oxide by using concentrated sulfuric acid or potassium permanganate as an oxidant, peeling the graphite oxide to form graphene oxide by adopting an ultrasonic peeling method, mixing the graphite oxide and a titanium source, preparing a graphite oxide/titanium dioxide composite material by liquid phase reaction, and then reducing the graphite oxide/titanium dioxide composite material into the graphene/titanium dioxide composite material by adopting liquid phase reduction. Electrochemical tests show that the graphene/titanium dioxide composite material prepared by the method has high specific capacity and cyclical stability, and is an ideal lithium ion battery cathode material. The material has relatively high specific capacity and cyclical stability, and can exert respective advantages of graphene and titanium dioxide. The preparation method is relatively simple, has low cost, and is suitable for industrialized production.

Description

technical field [0001] The invention discloses a preparation method of a graphene / titanium dioxide composite material for a negative electrode of a lithium ion battery, belonging to the fields of electrochemistry and new energy materials. Background technique [0002] Lithium-ion battery is a new type of chemical power source, which has been widely researched and applied due to its advantages of high energy density, high working voltage, low self-discharge rate, no memory effect, long cycle life, and no pollution. Since the commercialization of lithium-ion batteries, they have been widely used in various portable electronic devices such as mobile phones and notebook computers, and are also one of the ideal energy sources for electric vehicles. , At present, lithium-ion batteries are developing towards large-scale production at an alarming rate. [0003] Negative electrode materials are an important part of lithium-ion battery electrode materials. At present, research on lit...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139
CPCY02E60/122Y02E60/10
Inventor 范丽珍陶华超冯玉川陈立功
Owner UNIV OF SCI & TECH BEIJING
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