Preparation method of nickel hydroxide-graphene composite lithium battery material
A graphene composite and lithium battery material technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of battery life reduction, electrode active material activity decline, etc., and achieve short crystallization time, fast reaction rate, and high yield Effect
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[0018] The invention discloses a preparation method of a nickel hydroxide-graphene composite lithium battery material, comprising:
[0019] (1) adding graphene oxide into deionized water, and ultrasonically dispersing for 1-2 hours to obtain a graphene oxide suspension with a concentration of 0.5-1.5 mg / mL;
[0020] (2) in above-mentioned graphene oxide suspension, add nickel nitrate solution, stir, then add mixed alkali lye in the mode of stirring while dripping, the temperature of water bath control reaction is 50~60 ℃, wherein, described mixed alkali The dropping rate of the liquid is 1 to 2 drops per second, and after the reaction is completed, it is left to stand to obtain a mixture containing nickel hydroxide;
[0021] (3) take the above-mentioned nickel hydroxide generated as crystal seed, continue to drip mixed alkali liquor, stop the reaction when the granularity of nickel hydroxide reaches the requirement, vacuum filtration, wash to neutrality with deionized water an...
Example Embodiment
[0027] Example 1
[0028] (1) adding graphene oxide into deionized water, and ultrasonically dispersing for 1 h to obtain a graphene oxide suspension with a concentration of 0.5 mg / mL;
[0029] (2) in above-mentioned graphene oxide suspension, add 1mol / L nickel nitrate solution, stir, then add the mixed lye of sodium hydroxide and ammoniacal liquor that the ratio of volume is 1:1 in the mode of stirring while dripping, The temperature of the water bath controlled reaction is 50°C, wherein the dropping rate of the mixed alkali solution is 1 to 2 drops per second, the reaction is completed, and the mixture is allowed to stand to obtain a mixture containing nickel hydroxide;
[0030] (3) take the above-mentioned nickel hydroxide generated as crystal seed, continue to drip mixed alkali liquor, stop the reaction when the granularity of nickel hydroxide reaches the requirement, vacuum filtration, wash to neutrality with deionized water and absolute ethanol, Vacuum-drying at 80°C fo...
Example Embodiment
[0032] Example 2
[0033] (1) adding graphene oxide into deionized water, and ultrasonically dispersing for 1.5 h to obtain a graphene oxide suspension with a concentration of 1 mg / mL;
[0034] (2) in above-mentioned graphene oxide suspension, add 2mol / L nickel nitrate solution, stir, then add the mixed lye of sodium hydroxide and ammoniacal liquor that volume ratio is 2:1 in the mode of stirring while dripping, The temperature of the water bath control reaction is 55°C, wherein, the dropping rate of the mixed alkali solution is 1 to 2 drops per second, and the reaction is completed, and the mixture is allowed to stand to obtain a mixture containing nickel hydroxide;
[0035] (3) take the above-mentioned nickel hydroxide generated as crystal seed, continue to drip mixed alkali liquor, stop the reaction when the granularity of nickel hydroxide reaches the requirement, vacuum filtration, wash to neutrality with deionized water and absolute ethanol, Vacuum-drying at 80°C for 12h...
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