High-energy-density ternary positive electrode material as well as preparation method and application thereof
A technology of positive electrode materials and elements, applied in the field of high energy density ternary positive electrode materials and its preparation, can solve problems that hinder the development and application of positive electrode materials, improve cycle stability and thermal stability, and achieve cost green environmental protection and rate performance Good, long cycle life effect
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[0030] The invention provides a preparation method of a ternary positive electrode material, comprising the following steps:
[0031] Mixing nickel salt, cobalt salt and water to obtain a mixed salt solution; the molar ratio of the nickel salt and cobalt salt is x:y, 0.9≤x<1.0, 0.01≤y<0.1;
[0032] Mix the mixed salt solution, the alkali solution containing M elements, the precipitant solution and the complexing agent solution, and carry out a co-precipitation reaction to obtain a hydroxide precursor; the M elements include B, W, Mo, Nb, Sb , Sn, Si, Ge, Ta or Zr;
[0033] Pre-oxidizing the hydroxide precursor to obtain an oxide precursor;
[0034] After the oxide precursor and the lithium salt are mixed, sintering is performed to obtain a ternary positive electrode material.
[0035] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.
[0036] The invention mixes ...
Embodiment 1
[0061] Mix nickel sulfate and cobalt sulfate according to n(Ni):n(Co)=0.9:0.09, and prepare 5.0L with a total concentration of metal ions of 1.8mol L -1 Molybdenum trioxide is dissolved in 5.0wt.% sodium hydroxide solution to prepare 0.5L molybdenum molar concentration of 0.182mol L -1 Alkali solution, sodium hydroxide (precipitating agent) is formulated into 6.0L mass concentration and is the aqueous solution of 8.0%, ammoniacal liquor is formulated into 7.0L molar concentration is 6.5mol L -1 Then add the mixed salt solution, alkali solution of molybdenum element, sodium hydroxide solution, and ammonia solution into the co-precipitation reaction kettle and keep stirring, and the dropping rate is 3mL·min -1 , control the temperature of the reactor to be 65°C, the stirring speed to be 1100rpm, the pH=12.2, and the concentration of complexing agent to be 0.55mol·L -1 , after co-precipitation reaction for 60 hours, the precursor slurry of nickel-cobalt-molybdenum hydroxide was ...
Embodiment 2
[0064] Mix nickel sulfate and cobalt sulfate according to n(Ni):n(Co)=0.9:0.09, and prepare 4.5L with a total concentration of metal ions of 1.5mol L -1 aqueous solution; dissolving sodium tungstate in 10.0wt.% sodium hydroxide solution to prepare 0.45L tungsten molar concentration of 0.152mol L -1 Alkaline solution, potassium hydroxide is prepared into 7.0L of aqueous solution with a mass concentration of 10.0wt.%, and ammonia water is prepared into 5.0L with a molar concentration of 8mol L -1 aqueous solution; the mixed salt solution, alkaline solution of tungsten element, sodium hydroxide solution, and ammonia solution are added dropwise to the co-precipitation reaction kettle and kept stirring, and the dropping rate is 2mL·min -1 , control the temperature of the reactor at 60°C, the stirring speed at 1200rpm, the pH=12.5, and the complexing agent concentration at 0.6mol L -1 , after the reaction was carried out for 45 hours, the precursor slurry of nickel-cobalt-tungsten ...
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