A kind of zinc cobaltate/graphene composite negative electrode material and its preparation method and lithium ion battery
A graphene composite and negative electrode material technology, which is applied in the direction of batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor conductivity and poor cycle stability, and achieve the effects of excellent conductivity, buffer volume expansion, and excellent conductivity
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Embodiment 1
[0038] A preparation method of zinc cobaltate / graphene composite anode material includes the following steps:
[0039] (1) Disperse graphene oxide uniformly in water to obtain a 1mg / mL graphene oxide solution;
[0040] (2) Add 0.5mmol of Zn(NO 3 ) 2 ·6H 2 O and 1mmol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 5mL deionized water to obtain a salt solution, and then 15mmol NH 4 HCO 3 Slowly add dropwise to the above-mentioned salt solution and stir for 30 minutes to form a uniform mixed aqueous solution;
[0041] (3) Disperse the above mixed aqueous solution into the 50mL graphene oxide solution obtained in step (1), continue to stir for 30 minutes, then transfer the reactants to the reactor, and react at 180°C for 12 hours. After the reaction is finished, it is cooled to room temperature. The solid reaction product was washed with deionized water, and then placed in a freeze dryer to dry for 24 hours, then the product was transferred to a tube furnace and baked at 400°C for 3 hours, and ...
Embodiment 2
[0045] A preparation method of zinc cobaltate / graphene composite anode material includes the following steps:
[0046] (1) Disperse graphene oxide uniformly in water to obtain a 1mg / mL graphene oxide solution;
[0047] (2) Add 0.5mmol of Zn(NO 3 ) 2 ·6H 2 O and 1mmol of Co(NO 3 ) 2 ·6H 2 O was dissolved in 5mL deionized water to obtain a salt solution, and then 15mmol NH 4 HCO 3 Slowly add dropwise to the above-mentioned salt solution and stir for 30 minutes to form a uniform mixed aqueous solution;
[0048] (3) Disperse the above-mentioned mixed aqueous solution into the 40mL graphene oxide solution obtained in step (1), continue to stir for 30 minutes, then transfer the reactants to the reactor, and react at 200°C for 10 hours. After the reaction is finished, it is cooled to room temperature. The solid reaction product was washed with deionized water, and then dried in a freeze dryer for 24 hours, then the product was transferred to a tube furnace and baked at 350°C for 4 hours to ...
Embodiment 3
[0050] A preparation method of zinc cobaltate / graphene composite anode material includes the following steps:
[0051] (1) Disperse graphene oxide uniformly in water to obtain a 1mg / mL graphene oxide solution;
[0052] (2) Add 0.5mmol of Zn(CH 3 COOH) 2 ·4H 2 O and 1mmol of Co(CH 3 COOH) 2 ·4H 2 O was dissolved in 5mL deionized water to obtain a salt solution, and then 15mmol NH 4 HCO 3 Slowly add dropwise to the above-mentioned salt solution and stir for 30 minutes to form a uniform mixed aqueous solution;
[0053] (3) Disperse the above mixed aqueous solution into the 60mL graphene oxide solution obtained in step (1), continue to stir for 30 minutes, then transfer the reactants to the reactor, and react at 200°C for 12 hours. After the reaction is finished, it is cooled to room temperature. The solid reaction product was washed with deionized water, and then dried in a freeze dryer for 24 hours, then the product was transferred to a tube furnace and baked at 350°C for 4 hours to fi...
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