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US 11,984,591 B1Granted
Sodium-containing oxide positive electrode material and preparation method therefor and use thereof, and positive electrode plate and use thereof
AssigneeBeijing Easpring Material Technology Co., Ltd.
InventorsJun Wang, Feijiang Chen, Yafei Liu, Yanbin Chen
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Abstract
A sodium-containing oxide positive electrode material and a preparation method therefor and use thereof are disclosed. Also disclosed are a positive electrode plate and uses thereof.
Claims20
A sodium-containing oxide cathode material, wherein a content of a soluble alkali on a surface of the cathode material satisfys the following conditions:
- m(Na2CO3)+m(NaOH) is less than or equal to 15000 ppm;
- (1)
- 0.1≤m(Na2CO3)/m(NaOH)≤1;
- (2)
- wherein m(Na2CO3) denotes a content of Na2CO3 on the surface of the cathode material;
- m(NaOH) denotes a content of NaOH on the surface of the cathode material.
3 more elements
A method for preparing the sodium-containing oxide cathode material comprising the following steps:
- subjecting a sodium-manganese-iron-containing cathode material precursor to first sintering, cooling, crushing, and sieving to obtain a sodium-containing oxide cathode material;
- wherein an oxygen-containing atmosphere is introduced during the first sintering process;
- a flow rate of the introduced oxygen-containing atmosphere is within a range of 1-15 m3/h, and a humidity of the oxygen-containing atmosphere is less than or equal to 10 RH %;
- a temperature T1 of the first sintering satisfys the following conditions:
- 500×(1+y)≤T1≤400×(3−y)° C., y denotes a content of Mn in the sodium-containing oxide cathode material;
- a constant temperature time of the first sintering is within a range of 6-20 h;
- a temperature rise rate of the first sintering is less than or equal to 10° C./min.
4 more elements
Dependencies are inferred from the claim text.