Functionalized graphene-doped nickel-cobalt-lithium manganese oxide composite positive electrode material and preparation method
A composite positive electrode material, nickel-cobalt lithium manganate technology, applied in battery electrodes, electrochemical generators, structural parts, etc., can solve the problems of poor rate performance and cycle performance, and achieve good rate performance and cycle performance.
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[0049] The preparation method of the nickel-cobalt-lithium-manganese-oxide composite cathode material doped with functionalized graphene of the present invention comprises the following steps:
[0050] (1) Prepare respectively the salt solution A of nickel-cobalt-manganese, the graphene oxide aqueous solution B chemically modified by the betaine type zwitterionic compound, the lye C, the complexing agent solution D and the bottom solution E;
[0051] Wherein, the salt solution A of nickel-cobalt-manganese is based on nickel, cobalt, manganese sulfate, acetate or nitrate solution, and the total ion concentration of nickel, cobalt, and manganese in the salt solution of nickel-cobalt-manganese is 0.2mol / L -4mol / L, preferably 2-4mol / L.
[0052] The concentration of the graphene oxide aqueous solution B chemically modified by betaine-type zwitterionic compounds is 0.01-10 mg / mL, preferably 0.1-1 mg / ml.
[0053] The lye C is one or more of sodium hydroxide, potassium hydroxide or c...
Embodiment 1
[0062] (1) According to the molar ratio of 1:1:1, nickel sulfate, cobalt sulfate, and manganese sulfate salt solution A with a concentration of 0.2mol / L were prepared; Betaine 10 chemically modified graphene oxide aqueous solution B, sodium hydroxide solution C with a concentration of 4 mol / L, ammonia water D with a mass fraction of 1%, and bottom solution E with a mass fraction of 1%.
[0063] (2) The salt solution A of nickel-cobalt-manganese and the graphene oxide aqueous solution B modified by thiobetaine 10 are mixed uniformly to obtain solution F, and the mass ratio of nickel-cobalt-manganese salt and graphene oxide in solution F is 10:1, adjust When the pH reaches 11, the solutions C, D, and F are injected into the co-precipitation reactor by co-current feeding. By adjusting the dropping rate to 1mL / min, the dropping time is 1h, the reaction temperature is 60°C, and the stirring speed is 200rpm. Aging for 1 h after all the addition was completed.
[0064] (3) After the...
Embodiment 2
[0067] (1) According to the molar ratio of 1:1:1, nickel sulfate, cobalt sulfate, and manganese sulfate salt solution A with a concentration of 1mol / L were prepared; the concentration of the preparation was 0.1mg / mL dodecyl dimethyl betaine Modified graphene oxide aqueous solution B, 2mol / L sodium hydroxide solution C, 20% ammonia solution D and 5% bottom solution E.
[0068] (2) The salt solution A of nickel-cobalt-manganese and the graphene oxide aqueous solution B modified by dodecyl dimethyl betaine are mixed uniformly to obtain solution F, and the mass ratio of nickel-cobalt-manganese salt and graphene oxide in solution F is 1000 : 1, adjust the pH to 11, inject the solutions C, D, and F into the co-precipitation reactor by feeding in parallel, adjust the dropping rate to 5mL / min, the dropping time to 24h, and the reaction temperature to 55°C, stirring The speed is 500rpm, and the aging time is 72 hours after all the dropping is completed.
[0069] (3) After the reaction...
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