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A preparation method of nickel hydroxide/graphene composite material for positive electrode of nickel-hydrogen battery

A nickel-metal hydride battery and battery positive electrode technology, applied in the field of nickel-hydrogen battery electrode materials, can solve the problems of reduced battery life and reduced activity of electrode active materials, and achieve the effects of short crystallization time, improved electrochemical utilization, and good cycle performance

Active Publication Date: 2017-12-12
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these prior art schemes do not solve how to make Ni(OH) 2 The problem of uniform deposition on graphene sheets, Ni(OH) during fast charge and discharge 2 The effect of volume expansion is obvious, resulting in a decrease in the activity of the electrode active material and a decrease in battery life.

Method used

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  • A preparation method of nickel hydroxide/graphene composite material for positive electrode of nickel-hydrogen battery
  • A preparation method of nickel hydroxide/graphene composite material for positive electrode of nickel-hydrogen battery
  • A preparation method of nickel hydroxide/graphene composite material for positive electrode of nickel-hydrogen battery

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Embodiment 1

[0017] Weigh 100 mg GO and ultrasonically disperse it into 100 mL deionized water to obtain a 1 mg / mL brown suspension. Weigh 1.568g Ni(NO 3 ) 2 ·6H 2 O was added to the GO suspension and stirred for 2 h to complete the ion exchange. Then, 20 mL of 1.62 mol / L aqueous urea solution was added dropwise to the suspension, and stirring was continued for 1 h. The reaction mixture (GO:Ni(OH) 2 =1:5(wt.)) into a 500ml three-neck flask, put the flask in an Apex atmospheric pressure microwave reaction synthesizer, heat up to 100°C under a microwave power of 800W, react at a constant temperature for 3 hours, then cool naturally to room temperature, and then vacuumize filtered, and washed repeatedly with deionized water and absolute ethanol until neutral, and vacuum-dried at 80°C for 12h to obtain Ni(OH) 2 / graphene composites.

Embodiment 2

[0019] Weigh 100 mg GO and ultrasonically disperse it into 100 mL deionized water to obtain a 1 mg / mL brown suspension. Weigh 2.823g Ni(NO 3 ) 2 ·6H 2 O was added to the GO suspension and stirred for 2 h to complete the ion exchange. Then, 20 mL of 2.91 mol / L aqueous urea solution was added dropwise to the suspension, and stirring was continued for 1 h. The reaction mixture (GO:Ni(OH) 2 =1:9(wt.)) into a 500ml three-neck flask, put the flask in an Apex atmospheric pressure microwave reaction synthesizer, heat up to 100°C under a microwave power of 800W, react at a constant temperature for 3 hours, cool naturally to room temperature, and carry out vacuum pumping filtered, and washed repeatedly with deionized water and absolute ethanol until neutral, and vacuum-dried at 80°C for 12h to obtain Ni(OH) 2 / graphene composites.

[0020] The load ratio is GO:Ni(OH) 2 =1:13(wt.) The principle of the preparation method is the same as above.

[0021] figure 1 , figure 2 , i...

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Abstract

The invention discloses a preparation method of a nickel hydroxide / graphene composite material for a nickel-metal hydride battery positive pole, and belongs to the technical field of nickel-metal hydride battery pole materials. The method comprises the steps that graphite oxide is used as a raw material to be pressed into 1 mg / mL suspension liquid, nickel nitrate of different masses is added into the suspension liquid, the mass ratio of graphite oxide to nickel hydroxide in the composite material is 1:5 or 1:9 or 1:13, the suspension liquid with the nickel nitrate added is subjected to ultrasonic wave dispersion, then urea is dropwise added into the suspension liquid, the mixture is transferred into a three-mouth flask after being stirred, then the three-mouth flask is placed into an Apex normal-pressure micro wave reaction synthesizer for a reaction, then vacuum filtration is carried out, the product is washed with deionized water and absolute ethyl alcohol to be neutral, vacuum drying is carried out, and therefore the nickel hydroxide / graphene composite material is prepared. The preparation method has the advantages that the temperature gradient is small, the reaction speed is high, heating is uniform, crystallization time is short and the yield is high, and the preparation method is applicable to large-scale commercialized production.

Description

technical field [0001] The invention specifically relates to a method for preparing a nickel hydroxide / graphene composite material for a positive electrode of a nickel-hydrogen battery, and belongs to the technical field of nickel-hydrogen battery electrode materials. Background technique [0002] In recent years, the smog phenomenon in some cities in China has become more and more serious, and a large amount of vehicle exhaust pollutants is one of the main culprits. Therefore, vigorously developing electric vehicles is an important strategic measure to effectively deal with energy and environmental challenges and achieve sustainable development of the automotive industry. . Ni-MH batteries have the characteristics of high specific power, large current charge and discharge, no pollution, and good safety performance. The disadvantage is that it has a mild memory effect and poor performance in high temperature environments. However, due to its mature technology and good overal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/62H01M10/34
CPCH01M4/366H01M4/52H01M4/62H01M10/345H01M2004/021Y02E60/10
Inventor 赫文秀张永强孟晶李兴盛王亚雄周晨亮兰大为
Owner INNER MONGOLIA UNIV OF SCI & TECH
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