Preparation method and application of lithium ion battery precursor
A lithium-ion battery and precursor technology, which is applied in the manufacture of secondary batteries, secondary batteries, battery electrodes, etc., can solve the problems of large differences in battery performance and differences in the electrical properties of precursors, and achieve the effect of a simple method
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[0028] In one or some embodiments of the present disclosure, a method for preparing a lithium-ion battery precursor is provided, comprising the following steps:
[0029] Configuration solution: mix nickel salt, cobalt salt and manganese salt solution into metal cation solution; configure complexing agent solution and alkaline solution;
[0030] Mixing and stirring: first mix the metal cation solution and the complexing agent solution, then mix the mixture of the two with the alkaline solution; then control the temperature and pH to stir, the pH is alkaline, control the stirring temperature, and the pH is as high as β phase, controlled stirring temperature, high pH is α+β phase, controlled stirring temperature, low pH is α phase;
[0031] Aging and drying: Aging and drying the mixed and stirred product for a period of time.
[0032] The disclosure realizes the controllable phase of the lithium-ion battery precursor by controlling the temperature and pH during the stirring proc...
Embodiment 1
[0065] Such as figure 1 The method steps shown, first prepare the NiSO with a concentration of 2mol / L 4 ·6H 2 O, CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O mixed solution in which the molar ratio of metal cations satisfies Ni 2+ :Co 2+ :Mn 2+ = 6:2:2; prepare the sodium lactate complexing agent solution with a concentration of 2mol / L; prepare a sodium hydroxide solution with a concentration of 4mol / L as a precipitant; first pump the sodium hydroxide solution into the reactor, and strictly control the water bath temperature and the pH value at the corresponding temperature (55°C, pH=10.5), then pump the mixed solution with the metal cation solution and the complexing agent molar ratio of 1:1, control the stirring speed at 700 rpm, at a temperature of 55°C After aging in the reactor for 20 hours, deionized washing, and drying at 100°C, the (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 Precursor. By XRD diffraction pattern ( figure 2 ) shows that the diffraction characteristic peaks (003), (00...
Embodiment 2
[0068] Prepare NiSO with a concentration of 2mol / L 4 ·6H 2 O, CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O mixed solution in which the molar ratio of metal cations satisfies Ni 2+ :Mn 2+ :Co 2+ =6:2:2; preparation concentration is the sodium lactate solution of 2mol / L as buffer complexing agent solution; preparation concentration is the sodium hydroxide solution of 4mol / L as precipitating agent; earlier sodium hydroxide solution is pumped in the reactor, Control the temperature of the water bath to 60°C and the pH value to 11.0, then pump the mixed solution of metal cation solution and complexing agent with a molar ratio of 1:1.5, control the stirring speed to 700 rpm, and age in a reaction kettle at a temperature of 60°C After 12 hours, after deionized washing and drying at 100°C, (Ni 0.6 mn 0.2 co 0.2 )(OH) 2 Precursor. By XRD diffraction pattern ( image 3 ) shows that there is α-Ni(OH) in the sample spectrum 2 0.75H 2 The characteristic peak of O, and β-Ni(OH) appeared ag...
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