Composite lithium-ion battery positive electrode material and preparation method thereof and lithium-ion battery
A lithium-ion battery, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of limited improvement in material properties, and achieve improved contact interface, reduced material cost, improved safety and electrochemical performance. Effect
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Embodiment 1
[0048] The solution was prepared according to the Ni:Co:Mn molar ratio of 1 / 3:1 / 3:1 / 3, and the precursor oxide was prepared by co-precipitation under the condition of pH=10. Follow M Li :(M Ni + M Co + M Mn ) = 2:1 ratio of lithium source and precursor oxide, after mixing evenly, sintering at 600°C for 8 hours to synthesize lithium-rich ternary materials. Combining lithium-rich ternary materials with MnO 2 According to the molar ratio of 1:2, mix uniformly in ethanol medium, dry and grind uniformly to obtain mixed powder. Put the above mixed powder into a corundum boat, sinter at 850°C for 8 hours; 1 / 3 co 1 / 3 mn 1 / 3 o 2 / LiMn 2 o 4 .
[0049] Electrochemical performance test: Mix the above composite lithium-ion battery positive electrode material, binder PVDF and conductive agent acetylene black in a ratio of 93:3:4 in the solvent N-methylpyrrolidone, and coat the resulting slurry on aluminum foil Then, the solvent and moisture were removed by vacuum drying at 120°...
Embodiment 2
[0052] The solution was prepared according to the Ni:Co:Mn molar ratio of 0.5:0.2:0.3, and the precursor oxide was prepared by co-precipitation under the condition of pH=11. The lithium source and the precursor oxide were mixed according to the pH=1.3:1 ratio, and then sintered at 650°C for 7 hours at a high temperature to synthesize a lithium-rich ternary material. Combining lithium-rich ternary materials with MnO 2 According to the molar ratio of 1:0.6, mix uniformly in ethanol medium, dry and grind uniformly to obtain mixed powder. Put the above mixed powder into a corundum boat and sinter at 780°C for 12 hours; cool with the furnace to get the composite material LiNi 0.5 co 0.2 mn 0.3 o 2 / 0.3LiMn 2 o 4 .
[0053] Battery production conditions Except that the composite material, binder PVDF and conductive agent acetylene black are mixed in a ratio of 93:3:4, other preparation conditions are the same as in Example 1; the electrochemical performance test conditions ar...
Embodiment 3
[0056] The solution was prepared according to the Ni:Co:Mn molar ratio of 0.8:0.1:0.1, and the precursor oxide was prepared by co-precipitation under the condition of pH=12. Follow M Li :(M Ni + M Co + M Mn ) = 1.5:1 ratio of lithium source and precursor oxide, after mixing evenly, sintering at 600°C for 8 hours to synthesize lithium-rich ternary materials. Combining lithium-rich ternary materials with MnO 2 According to the molar ratio of 1:1, mix uniformly in ethanol medium, dry and grind uniformly to obtain mixed powder. Put the above mixed powder into a corundum boat, sinter at 850°C for 8 hours; 0.8 co 0.1 mn 0.1 o 2 / 0.5LiMn 2 o 4 .
[0057] Battery production conditions Except that the composite material, binder PVDF and conductive agent acetylene black are mixed in a ratio of 93:3:4, other preparation conditions are the same as in Example 1; the electrochemical performance test conditions are also the same as in Example 1. Electrochemical performance test r...
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