Graphene/cobalt-based complex lithium battery negative electrode material and preparation method thereof
A negative electrode material, graphene technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle stability and low capacity, and achieve the effect of improving conductivity, high capacity, and simple and safe operation process
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Embodiment 1
[0023] Step 1: ultrasonically disperse 10 mg of graphite oxide prepared by Hummer in 20 mL of DMF to obtain a graphene oxide dispersion, the ultrasonic time is 60 min, dissolve 1 mmol of cobalt chloride hexahydrate in 5 mL of DMF to obtain a cobalt chloride solution, 2 mmol of DABCO DABCO solution was prepared by dissolving in 5 mL DMF.
[0024] Step 2: Add the cobalt chloride solution obtained in step 1 dropwise to the graphene oxide solution and sonicate for 5 minutes while stirring. After mixing evenly, add the DABCO solution dropwise into the mixed solution, continue to sonicate for 5 minutes, and mix the uniformly mixed solution Transfer to a hydrothermal kettle for hydrothermal reaction, the reaction temperature is 110°C, and the reaction time is 24h. The filling amount of the mixed solution in the inner tank of the reactor is 60%.
[0025] Step 3: The product obtained in Step 2 is centrifugally washed and dried to obtain a graphene / cobalt-based complex lithium battery ...
Embodiment 2
[0028] Step 1: ultrasonically disperse 20mg of graphite oxide prepared by Hummer in 20mL DMF to obtain a graphene oxide dispersion, the ultrasonic time is 80min, dissolve 1mmol cobalt nitrate hexahydrate in 10mL DMF to obtain a cobalt cobalt nitrate solution, and dissolve 2mmol DABCO in 5 mL of DMF gave a DABCO solution.
[0029] Step 2: Add the cobalt nitrate solution obtained in step 1 dropwise to the graphene oxide dispersion while stirring, ultrasonicate for 15 minutes, then add the DABCO solution dropwise to the mixed solution, continue ultrasonicating for 5 minutes, and transfer the mixed solution to a hydrothermal Hydrothermal reaction in the kettle, the reaction temperature is 150°C, and the reaction time is 24h. The filling amount of the mixed solution in the reactor liner is 70%.
[0030] Step 3: The product obtained in Step 2 is centrifugally washed and dried to obtain a graphene / cobalt-based complex lithium battery negative electrode material.
[0031] The XRD pa...
Embodiment 3
[0033] Step 1: Ultrasonic disperse 30 mg of graphite oxide prepared by Hummer in 15 mL of DMF to obtain a graphene oxide dispersion. The ultrasonic time is 100 min. Dissolve 1 mmol of cobalt acetate tetrahydrate in 10 mL of DMF to obtain a cobalt acetate solution. Dissolve 2 mmol of DABCO in 10 mL of DMF In the DABCO solution.
[0034] Step 2: Add the cobalt acetate solution obtained in step 1 dropwise to the graphene oxide dispersion while stirring, ultrasonicate for 20 minutes, then add the DABCO solution dropwise to the mixed solution, continue ultrasonicating for 5 minutes, and transfer the mixed solution to a hydrothermal Hydrothermal reaction in the kettle, the reaction temperature is 130°C, and the reaction time is 36h. The filling amount of the mixed solution in the reactor liner is 70%.
[0035] Step 3: The product obtained in Step 2 is centrifugally washed and dried to obtain a graphene / cobalt-based complex lithium battery negative electrode material.
[0036] The ...
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