Cathode active material, preparation method thereof, positive plate, and lithium ion battery
A cathode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low energy density, and achieve the effect of improving ionic conductivity and energy density
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[0020] The present invention also provides a preparation method of the above-mentioned positive electrode active material, comprising 2 MoO 4 Dissolve in deionized water, then add Ni 2+ salt solution, and adjust the pH value to 3-4 to react, then evaporate the solution at 60-80°C, precipitate out, cool and filter to obtain the positive electrode active material.
[0021] The present invention uses Li 2 MoO 4 And containing Ni 2+ Chloride / nitrate / sulfate are the main synthetic raw materials, adjust the pH value of the solution to facilitate the self-assembly formation of molecular cluster ions, heat and stir the solution for chemical reactions, and finally form molecular cluster ions [NiMo 6 o 24 h 6 ] 4- , after the solution was concentrated by evaporation, Li + Combined with the anion as a counter cation, the compound Li in the present invention is formed 4 [NiMo 6 o 24 h 6 ].
[0022] In the above-mentioned preparation method, the addition amount of each materia...
Embodiment 1
[0048] This example is used to illustrate the positive electrode active material disclosed in the present invention and its preparation method.
[0049] 1. Preparation of positive electrode active material
[0050] 5g (28.77mmol) of Li 2 MoO 4 Dissolve in 60ml deionized water, then add 1.2564g (4.78mmol) of NiSO 4 ·6H 2 O solid, then add concentrated sulfuric acid drop by drop, adjust the pH of the solution to 3.5, then adjust the temperature of the solution to 60-80°C, evaporate the solution until precipitation appears in the solution, stop heating, and cool the solution naturally.
[0051] The precipitate was washed with a mixed solvent containing water and ethanol (volume ratio: 1:1), followed by suction filtration and drying to obtain a positive electrode active material with an average particle diameter of 480 nm.
[0052] 2. Characterization of crystal structure
[0053] Carry out X-ray diffraction analysis to positive pole active material, its X-ray diffraction pat...
Embodiment 2
[0063] This example is used to illustrate the preparation method of the positive electrode active material, the positive electrode sheet and the lithium ion battery disclosed in the present invention.
[0064] 1. Preparation of positive electrode active material
[0065] 7.48g (43.02mmol) of Li 2 MoO 4 Dissolve in 60ml deionized water, then add 1.2564g (4.78mmol) of NiSO 4 ·6H 2 O solid, then add concentrated sulfuric acid drop by drop, adjust the pH of the solution to 3, then adjust the temperature of the solution to 60-80°C, evaporate the solution until precipitation appears in the solution, stop heating, and cool the solution naturally.
[0066] The precipitate was washed with a mixed solvent containing water and ethanol (volume ratio: 1:5), followed by suction filtration and drying to obtain a positive electrode active material with an average particle diameter of 475 nm.
[0067] 2. Preparation of positive electrode sheet
[0068] The positive electrode active materi...
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