A kind of positive electrode active material and preparation method thereof, positive electrode sheet and lithium ion battery
A positive electrode active material and positive electrode material technology, applied in the field of lithium-ion secondary batteries, can solve the problems of low energy density and achieve the effect of ensuring cycle performance and excellent comprehensive electrochemical performance
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[0025] Simultaneously, the present invention also provides the preparation method of above-mentioned cathode active material, comprises the following steps:
[0026] S1. Provide core material; the core material is X 4 [NiMo 6 o 24 h 6 ] or X 3 [CoMo 6 o 24 h 6 ]; X is K or Na; the core material includes nanoparticles and microparticles, the average particle diameter of the nanoparticles is 100-600nm, and the average particle diameter of the microparticles is 1-20μm;
[0027] S2. Dispersing the core material in a mixed solvent of water and a water-soluble alcoholic organic solvent to obtain a mixed solution;
[0028] S3, adding a dopant, an oxidizing agent and a polymerization agent to the mixed liquid, reacting under stirring conditions, and obtaining the positive electrode active material after filtering and drying;
[0029] The dopant is selected from sodium dodecylbenzenesulfonate, sodium dodecylsulfonate, sodium p-toluenesulfonate, sodium benzenesulfonate, sodium p...
Embodiment 1
[0066] This example is used to illustrate the positive electrode active material disclosed in the present invention, its preparation method, positive electrode sheet and lithium ion battery.
[0067] 1. Preparation of positive electrode active material
[0068] 3.29g (2.66mmol) of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 70ml of deionized water, after it was completely dissolved, the solution was heated and boiled, and then 20ml of NiSO dissolved in 0.815g (3.08mmol) was added 4 ·6H 2 O solution. The solution was boiled again for 5 min, then the temperature was adjusted to 60-80°C and the solution was evaporated. When the remaining amount of the solution is about 40ml, it becomes turbid, and when it continues to evaporate to the remaining about 20ml, a large amount of precipitation occurs, stop heating, and allow the solution to cool naturally, and the molecular formula is (NH 4 ) 4 [NiMo 6 o 24 h 6 ] precursor material.
[0069] 2g of (NH 4 ) 4 [NiMo 6 o 2...
Embodiment 2
[0077] This example is used to illustrate the positive electrode active material disclosed in the present invention, its preparation method, positive electrode sheet and lithium ion battery.
[0078] 1. Preparation of positive electrode active material
[0079] 3.29g (2.66mmol) of (NH 4 ) 6 Mo 7 o 24 4H 2 O was dissolved in 70ml of deionized water, after it was completely dissolved, the solution was heated and boiled, and then 20ml of NiSO dissolved in 0.815g (3.08mmol) was added 4 ·6H 2 O solution. The solution was boiled again for 5 min, then the temperature was adjusted to 60-80°C and the solution was evaporated. When the remaining amount of the solution is about 40ml, it becomes turbid, and when it continues to evaporate to the remaining about 20ml, a large amount of precipitation occurs, stop heating, and allow the solution to cool naturally, and the molecular formula is (NH 4 ) 4 [NiMo 6 o 24 h 6 ] precursor material.
[0080] 2g of (NH 4 ) 4 [NiMo 6 o 2...
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Abstract
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