Preparation method of nickel hydroxide/graphene composite material for nickel-metal hydride battery positive pole
A technology of nickel hydroxide and composite materials, which is applied in the direction of battery electrodes, secondary batteries, airtight batteries, etc., can solve the problems of decreased activity of electrode active materials and reduced battery life, and achieves improved electrochemical utilization and crystallization time Short, fast-response effects
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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 1.568gNi(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 2.823gNi(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, 2.91 mol / L aqueous urea solution was added dropwise to the suspension, and the 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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