Preparation method of cathode active material, cathode piece and lithium ion battery
A positive electrode active material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low energy density
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[0017] The preparation method of positive electrode active material provided by the invention comprises the following steps:
[0018] S1, obtain the molecular formula as (NH 4 ) 3 [CoMo 6 o 24 h 6 ] precursor material, the average particle size of the precursor material is more than 30 μm;
[0019] S2. Dissolving the precursor material in water, adding a water-soluble alcoholic organic solvent under stirring conditions, performing recrystallization, and obtaining the positive electrode active material after filtration; the volume ratio of the water-soluble alcoholic organic solvent to water 1-5:1.
[0020] In the present invention, the molecular formula is (NH 4 ) 3 [CoMo 6 o 24 h 6 ] is a material known in the prior art, and can be prepared by conventional methods, for example, 1.59g (1.29mmol) of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 70ml of deionized water, and after it was completely dissolved, the solution was heated and boiled, and then 20ml of CoSO ...
Embodiment 1
[0049] This example is used to illustrate the positive electrode active material disclosed in the present invention and its preparation method.
[0050] 1. Synthesis of precursor materials
[0051] 1.59g (1.29mmol) of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 70ml of deionized water, and after it was completely dissolved, the solution was heated and boiled, and then 20ml of CoSO dissolved in 0.42g (1.5mmol) was added. 4 ·7H 2 O and 0.936g (4.102mmol) (NH 4 ) 2 S 2 o 8 The solution. The solution was boiled again for 5 min, then the temperature was adjusted to 60-80°C and the solution was evaporated. Stop heating until a blue precipitate appears, and allow the solution to cool naturally.
[0052] 2. Characterization of crystal structure
[0053] Carry out X-ray diffraction analysis to precipitate, its X-ray diffraction pattern is as follows figure 1 shown.
[0054] 3. Characterization of crystal morphology
[0055] Scanning electron microscopy analysis of the p...
Embodiment 2
[0065] 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.
[0066] 1. Preparation of positive electrode active material
[0067] At room temperature, dissolve 0.5 g of the precursor material synthesized in Example 1 in 50 ml of distilled water, stir to dissolve, add 150 ml of ethanol under stirring conditions, and after the product is precipitated, filter to obtain a positive electrode active material with an average particle size of 400 nm .
[0068] 2. Preparation of positive electrode sheet
[0069] The positive electrode active material: conductive carbon black: positive electrode binder (PVDF) is subjected to slurry preparation, coating, drying, rolling, and cutting according to the mass percentage of 40%: 55%: 5%, to obtain the positive electrode sheet.
[0070] 3. Preparation of Li-ion battery
[0071] The above-mentioned posi...
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