Positive active material and preparation method thereof, positive plate and lithium-ion battery
A positive electrode active material and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low energy density
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[0021] The present invention also provides the preparation method of above-mentioned cathode active material, comprising Na 2 MoO 4 2H 2 O was dissolved in deionized water, then Ni was added 2+ The salt solution, and adjust the pH value to 2-4 to react, then evaporate the solution at 60-80 ° C, precipitate out, and obtain crystals after cooling and filtering.
[0022] The crystals prepared above have the molecular formula Na 4 [NiMo 6 o 24 h 6 ] The positive electrode active material.
[0023] The present invention uses Na 2 MoO 4 2H 2 O 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, Na + Combined with the anion as a counter cation to form the compound Na in ...
Embodiment 1
[0052] This example is used to illustrate the positive electrode active material disclosed in the present invention and its preparation method.
[0053] 1. Crystal synthesis
[0054] 7.23g (29.88mmol) of Na 2 MoO 4 2H 2 O was dissolved in 100 ml deionized water, followed by the addition of 2.256 g (8.58 mmol) of NiSO 4 ·6H 2 O solid, then add concentrated sulfuric acid dropwise to 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 occurs in the solution, stop heating, and cool the solution naturally to obtain crystals.
[0055] 2. Characterization of crystal structure
[0056] Carry out X-ray diffraction analysis to crystal body, its X-ray diffraction pattern is as follows figure 1 shown.
[0057] 3. Characterization of crystal morphology
[0058] Scanning electron microscopy analysis of the crystals, such as figure 2 As shown, the particle morphology is micron-sized block particles...
Embodiment 2
[0068] 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.
[0069] 1. Crystal synthesis
[0070] 12.455g (51.48mmol) of Na 2 MoO 4 2H 2 O was dissolved in 100 ml deionized water, followed by the addition of 2.256 g (8.58 mmol) 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 to obtain crystals.
[0071] 2. Recrystallization
[0072]Dissolve 2g of the above-mentioned crystals in 400ml of distilled water at room temperature, stir to dissolve, add 1200ml of ethanol under stirring conditions, and after the product is precipitated, filter to obtain the positive active material with an average particle size of...
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