Positive electrode material of lithium-ion battery and preparation method therefor
地域：
Beijing
摘要
The present disclosure relates to a positive electrode material for a lithium ion battery and its preparation. The positive electrode material in accordance with the present disclosure has an intrinsic specific surface area of 5-13 m2/g. The positive electrode material in accordance with the present disclosure has an intrinsic specific surface area and an intrinsic pore size within the required ranges. In this regard, the positive electrode material in accordance with the present disclosure has excellent particle strength, excellent Li ion transference ability, and good resistance to electrolyte erosion. When used in lithium batteries, it may impart the batteries with excellent rate performance and cycle performance. The present disclosure also relates to a method for preparing the positive electrode material.
說明書
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- subjecting a precursor of the positive electrode material to lithiating by:
- mixing the precursor with a lithium source; and
- subjecting to programmed calcining under an oxygen atmosphere, wherein the programmed calcining comprises:
- subjecting to a first calcining at 300-500° C. to obtain the first calcined product; and
- subjecting to a second calcining to obtain the second calcined product,
- wherein, in the second calcining, the calcining temperature T and the Ni content in the nickel cobalt manganese active material follow the equation: 670+(1?x)*500≤T≤780+(1?x)*500,
- wherein 0.3≤x≤0.99.
In one embodiment, the method for preparing the above positive electrode material may comprise:
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- (1) co-deposing nickel salts, cobalt salts and manganese salts, to form a precursor of the nickel cobalt manganese active materials;
- (2) subjecting the precursor of the nickel cobalt manganese active materials to doping and lithiating by:
- mixing the precursor of the nickel cobalt manganese active materials with a lithium source, a first dopant containing a first dopant element, a second dopant containing a second dopant element and a third dopant containing a third dopant element; and
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