US 11,777,136 B2 · Cathode active material for sodium ion battery, and preparation process thereof

Abstract

Disclosed is a method of preparing a cathode active material useful in a sodium ion secondary battery having high reversible capacity and excellent cycle characteristics. The method for preparing a cathode active material composed of Zrw-doped NaxLiyMzOa includes the steps of (A) doping LiyMzOa with Zrw to provide Zrw-doped LiyMzOa; and (B) dissociating Li ion from the Zrw-doped LiyMzOa and inserting Na ion thereto to provide the Zrw-doped NaxLiyMzOa, wherein M is selected from Ti, V, Cr, Mn, Fe, Co, Ni, Mo, Ru, and combinations thereof, and wherein 0.005<w<0.05, 0.8≤x≤0.85, 0.09≤y≤0.11, 7≤x/y≤10, 0.7≤z≤0.95, and 1.95≤a≤2.05. When the cathode active material is used for manufacturing a cathode for a sodium ion secondary battery, the battery can substitute for a conventional, expensive lithium ion secondary battery.

Claims5

Dependent claims

A method for preparing a cathode active material comprising Zrw-doped NaxLiyMzOa for sodium ion secondary battery, the method comprising the steps of:

(A) doping LiyMzOa with Zrw to provide Zrw-doped LiyMzOa;
and
(B) dissociating Li ion from the Zrw-doped LiyMzOa and inserting Na ion thereto to provide the Zrw-doped NaxLiyMzOa,
wherein M is selected from Ti, V, Cr, Mn, Fe, Co, Ni, Mo, Ru, and combinations thereof, and
wherein:
0.005<w<0.05,
0.8≤x≤0.85,
0.09≤y≤0.11,
7≤x/y≤10,
0.7≤z≤0.95, and
1.95≤a≤2.05,
wherein step (A) comprises the substeps of:
(A1) mixing aqueous LiyMzOa solution with an aqueous Zr solution, and drying the resultant mixture at a temperature of 50-150° C. for 1-5 hours;
and
(A2) heat treating the dried mixture,
wherein the aqueous LiyMzOa solution is mixed with the aqueous Zr solution at a weight ratio of 1:0.5 to 1:1.1, in substep (A1).

13 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/725,656Filed 23 Dec 2019

Priority

KR 10-2019-01116919 Sep 2019

Published

US 2021/0075053 A111 Mar 2021

Granted

3 Oct 2023

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 codes

H01M 10/054
Accumulators with non-aqueous electrolyte: accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
H01M 4/0445
Activating, forming or electrochemical attack of the supporting material: forming after manufacture of the electrode, e.g. first charge, cycling
H01M 4/0447
Forming after manufacture of the electrode, e.g. first charge, cycling: of complete cells or cells stacks
H01M 4/0459
By electrochemical processing: electrochemical doping, intercalation, occlusion or alloying

Cathode active material for sodium ion battery, and preparation process thereof

Life of this patent

Cathode active material for sodium ion battery, and preparation process thereof

Life of this patent

Abstract

Claims5