Preparation method for long-service-life and high-cycling-power type lithium manganate positive electrode material
A cathode material and cycle power technology, applied in the field of lithium battery cathode material preparation, can solve the problems of poor cycle performance and electrochemical stability, limit industrialization, etc., and achieve the effects of fast charging speed, high compaction density and high capacity
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Embodiment 1
[0020] The invention provides a method for preparing a long-life, high-cycle power type lithium manganate positive electrode material, comprising the following steps:
[0021] (1) be that the aqueous solution of 0.05mol / L manganese salt and the aqueous solution of the carbonate of 2mol / L are mixed by concentration, stir reaction 15min, obtain spherical manganese carbonate after separation, washing, drying;
[0022] (2) disperse the spherical manganese carbonate obtained in the step (1) in water to obtain a dispersion liquid, in the dispersion liquid, dropwise adding concentration is the oxidizing agent of 2mol / L, stir 1min and drop dilute acid, react 1min, separate, wash, Obtain spherical manganese dioxide after drying;
[0023] (3) Spherical manganese dioxide and lithium carbonate are dispersed in an organic solvent, crushed by ball milling, dried, and then sintered once under an oxygen atmosphere to obtain a lithium manganate cathode material precursor;
[0024] (4) Put the...
Embodiment 2
[0028] (1) be that the aqueous solution of 3mol / L manganese salt and the aqueous solution of the carbonate of 8mol / L are mixed by concentration, stir reaction 15min, obtain spherical manganese carbonate after separation, washing, drying;
[0029] (2) disperse the spherical manganese carbonate obtained in the step (1) in water to obtain a dispersion liquid, add dropwise the oxidizing agent whose concentration is 9mol / L in the dispersion liquid, stir 1min and drop dilute acid, react for 1~3min, separate, After washing and drying, spherical manganese dioxide is obtained;
[0030] (3) Spherical manganese dioxide and lithium carbonate are dispersed in an organic solvent, crushed by ball milling, dried, and then sintered once under an oxygen atmosphere to obtain a lithium manganate cathode material precursor;
[0031] (4) Put the lithium manganate positive electrode material precursor obtained in step (3) into a hot pressurized device and burn to obtain the target product.
[0032]...
Embodiment 3
[0035] (1) be that the aqueous solution of 1mol / L manganese salt and the aqueous solution of the carbonate of 8mol / L are mixed by concentration, stir reaction 15min, obtain spherical manganese carbonate after separation, washing, drying;
[0036] (2) disperse the spherical manganese carbonate obtained in the step (1) in water to obtain a dispersion liquid, add dropwise an oxidant whose concentration is 4mol / L in the dispersion liquid, stir 2min and drop dilute acid, react for 1~3min, separate, After washing and drying, spherical manganese dioxide is obtained;
[0037] (3) Spherical manganese dioxide and lithium carbonate are dispersed in an organic solvent, crushed by ball milling, dried, and then sintered once under an oxygen atmosphere to obtain a lithium manganate cathode material precursor;
[0038] (4) Put the lithium manganate positive electrode material precursor obtained in step (3) into a hot pressurized device and burn to obtain the target product.
[0039] In the p...
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