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Preparation method of zinc oxide /graphene composite material for lithium ion battery

A technology for lithium ion batteries and composite materials, which is applied in the field of preparation of zinc oxide/graphene composite materials for lithium ion batteries, can solve the problems of poor conductivity and volume expansion of zinc oxide, and achieves improved electrochemical performance, simple and easy operation, The effect of strong conductivity

Inactive Publication Date: 2014-09-03
SHAANXI UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the above-mentioned shortcoming of prior art, the object of the present invention is to provide a kind of preparation method of zinc oxide / graphene composite material for lithium ion battery, utilize the zinc oxide / graphene composite material prepared by this method as the negative electrode material of lithium battery , can overcome the problems of poor conductivity and serious volume expansion effect of zinc oxide, and has the characteristics of strong cycle stability and strong conductivity; this method has the characteristics of simple operation, high repeatability and low cost

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  • Preparation method of zinc oxide /graphene composite material for lithium ion battery
  • Preparation method of zinc oxide /graphene composite material for lithium ion battery
  • Preparation method of zinc oxide /graphene composite material for lithium ion battery

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preparation example Construction

[0027] Referring to accompanying drawing, the present invention is a kind of preparation method of zinc oxide / graphene composite material for lithium ion battery, comprising:

[0028] Step 1: Take 0.0080-0.0800g of graphite oxide and add it to 80ml of solvent, put the mixture into an ultrasonic cleaner with an ultrasonic frequency of 40kHz and perform ultrasonic treatment for 0.5-3h to obtain a graphene oxide dispersion;

[0029] Step 2: Add 0.0020-0.3000g of metal zinc salt to the graphene oxide dispersion prepared above and stir evenly, then add NaOH solution or ammonia water dropwise for acid-base adjustment, so that the pH value of the mixed solution is 8-13;

[0030] Step 3: Transfer the above mixed solution to a 100ml hydrothermal reaction kettle, and react for 2-10 hours at a temperature of 80-180°C. After the reaction is completed, wait for it to cool down to room temperature naturally, then wash with water and ethanol for 3 times, and then carry out Vacuum drying trea...

Embodiment 1

[0040] Weighed 0.0800g of graphite oxide and added it to 80ml of deionized water, put the mixture into an ultrasonic cleaner with an ultrasonic frequency of 40kHz, and performed ultrasonic treatment for 2h to obtain a graphene oxide dispersion. Weigh 0.2000g zinc nitrate (Zn(NO 3 ) 2 ) was added to the graphene oxide dispersion obtained above and stirred evenly, and the concentration was added dropwise to 30wt% ammonia (NH 3 ·H 2 O) carry out acid-base adjustment, make the pH value=8 of mixed solution. Transfer the above mixed solution to a 100ml hydrothermal reaction kettle, and react for 2 hours at a temperature of 180°C. After the reaction is completed, wait until the temperature is naturally lowered to room temperature, and then wash with water and ethanol three times respectively, and then at a temperature of 60°C, Vacuum drying for 15 hours to obtain a partially reduced graphene-zinc oxide composite material. The above partially reduced graphene-zinc oxide composite ...

Embodiment 2

[0042] Weighed 0.0400g of graphite oxide and added it to 80ml of ethanol, put the mixture into an ultrasonic cleaner with an ultrasonic frequency of 40kHz, and performed ultrasonic treatment for 1h to obtain a graphene oxide dispersion. Weigh 0.1000g zinc chloride (ZnCl 2) was added to the graphene oxide dispersion prepared above and stirred evenly, and the concentration was 1mol / L sodium hydroxide (NaOH) was added dropwise for acid-base adjustment, so that the pH value of the mixed solution=10. Transfer the above mixed solution to a 100ml hydrothermal reaction kettle, and react for 10 hours at a temperature of 120°C. After the reaction is completed, wait until the temperature is naturally lowered to room temperature, and then wash with water and ethanol three times respectively, and then at a temperature of 80°C, Vacuum drying for 10 h to obtain a partially reduced graphene zinc oxide composite material. The above partially reduced graphene zinc oxide composite material was ...

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Abstract

A preparation method of a zinc oxide / graphene composite material for a lithium ion battery is as follows: first, taking graphite oxide to add into a solvent for ultrasonic treatment to obtain a graphene oxide dispersion liquid; then taking a zinc salt to add into the graphene oxide dispersion liquid, performing pH adjustment to make the mixed solution alkaline; then transferring the mixed solution to a hydrothermal reactor for reaction, cooling to room temperature when the reaction is finished, respectively washing for 3 times with water and ethanol, performing vacuum drying treatment to obtain a partly reduced graphene-zinc oxide composite material; finally, calcining the partly reduced graphene-zinc oxide composite material under inert atmosphere, cooling to room temperature when the calcining is finished to obtain the zinc oxide / graphene composite material. The zinc oxide / graphene composite material prepared by the method can be used as a negative electrode material for lithium ion batteries, can overcome the problems of poor conductivity and serious volume expansion effect of zinc oxide, has the characteristics of strong cyclic stability and strong conductivity; and the method has characteristics of simple operation, high repeatability and low cost.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery negative electrode materials, in particular to a preparation method of a zinc oxide / graphene composite material for lithium-ion batteries. Background technique [0002] Due to the advantages of high working voltage, high energy density, and no memory effect, lithium-ion batteries are widely used in the fields of small mobile electronic products such as cameras, mobile phones, and notebook computers. Eye-catching development prospects. However, with the aggravation of the energy crisis and the rapid growth of portable electronic devices and electric vehicles, the current commercial lithium-ion battery graphite anode material can no longer meet the needs of its people. [0003] Metal oxides have become a modern research hotspot due to their high theoretical specific capacity (600mAh / g). Zinc oxide is rich in resources, environmentally friendly, and has a high theoretical specific capaci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36
CPCH01M4/362H01M4/483H01M4/625H01M10/0525Y02E60/10
Inventor 张利锋张金振刘毅郭守武
Owner SHAANXI UNIV OF SCI & TECH
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