Composite positive electrode material, preparation method thereof and lithium ion battery
A composite positive electrode material and lithium-ion battery technology, which is applied in the preparation/purification of secondary batteries, battery electrodes, carbon, etc., can solve the problems of poor stability and poor cycle performance of positive electrode materials such as ternary materials, and achieve improved cycle use Longevity and stable performance, ensuring sustainable use, combined with stable effects
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[0049] The second aspect of the embodiment of the present invention provides a method of preparing a composite positive material, comprising the steps of:
[0050] S10. Get a positive electrode active material and a transition metal organic matter;
[0051] S20. Mix the positive electrode active material, the transition metal organic matter is mixed with the solvent, and after drying, the composite positive material precursor is obtained;
[0052] S30. The composite positive electrode material precursor is calcined to obtain the desired composite positive electrode material, and the surface of the composite positive electrode material has a coating containing a transition metal oxide and a carbon material.
[0053] The method of preparing a composite positive electrode material provided in the second aspect of the present invention is carried out by a transition metal organic matter as a coated raw material, and the transition metal organic substance is uniform in a molecular leve...
Embodiment 1
[0076] A composite ternary positive material, including preparation steps:
[0077] 1. According to the molar ratio of the three-yuan front body and the source of the source of 1: 1.05, take the 622 type three-dollar precursor 200g (2.283 mol), 1,5.65 g (2.283 mol), and 15 ° C under the air atmosphere / MIN warmth speed is heated to 600 ° C, constant temperature for 10 hours, then heating the temperature above 940 ° C at a temperature of 5 ° C / min, constant temperature for 16 hours, cooling, and producing a triple positive electrode A;
[0078] 2, 0.422 g of aluminum acetate, dissolved in 42.2 ml of ethanol, formulated into an aluminum-containing organic reagent solution, and the prepared ternary positive electrode A is added to an aluminum-containing organic reagent solution, and thoroughly stirred, placed in a flash dryer. Fast drying at 300 ° C to obtain a ternary positive electrode B coated with aluminum aluminum aluminum acid;
[0079] 3, the ternary positive electrode B is...
Embodiment 2
[0081] A composite ternary positive material, including preparation steps:
[0082] 1. According to the molar ratio of the three-yuan front body and the source of the source of 1: 1.05, take 200 g (2.174 mol), taking 95.65 g (2.283 mol), and 5 under the air atmosphere The temperature rise rate of ° C / min is warmed to 600 ° C, the temperature is 8 hours, and then the temperature above 850 ° C is heated to 850 ° C, the temperature is 16 hours, cooled, and the three-dimensional polarity A;
[0083] 2. Take 1.02 g of positive propanol zirconium, dissolved in 102 ml of ethanol to be formulated into a zirconium organic reagent solution, and the prepared ternary positive electrode A is added to the zirconium organic reagent solution, stirred well, placed in a flash dryer , Fast drying at 150 ° C to obtain a three-dimensional positive electrode B coated zirconium acetate reagent;
[0084] 3, the ternary positive electrode B is heated to 600 ° C at a temperature of 15 ° C / min, and the ...
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Abstract
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