Active material, electrode, secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-11984588-B2
Application number	US-202017007660-A
Country	US
Kind code	B2
Filing date	Aug 31, 2020
Priority date	Mar 12, 2019
Publication date	May 14, 2024
Grant date	May 14, 2024

Abstract

According to one embodiment, there is provided an active material represented by a general formula Lix(NiaCobMncMd)1−s(Nb1−t−uTatM′u)sO2. Here, M is at least one selected from the group consisting of Li, Ca, Mg, Al, Ti, V, Cr, Zr, Mo, Hf, and W, M′ is at least one selected from the group consisting of K, P, Fe, Si, Na, Cu and Zn, and 1.0≤x≤1.3, 0≤a≤0.9, 0≤b≤1.0, 0≤c≤0.8, 0≤d≤0.5, a+b+c+d=1, 0.005≤s≤0.3, 0.0005≤t≤0.1, and 0≤u≤0.3 are satisfied.

First claim

What is claimed is:

1. An active material represented by a general formula Li x (Ni a Co b Mn c M d ) 1−s (Nb 1−t−u Ta t M′ u ) s O 2 , where M is at least one selected from the group consisting of Li, Ca, Mg, Al, Ti, V, Cr, Zr, Mo, Hf, and W, M′ is at least one selected from the group consisting of K, P, Fe, Si, Na, Cu and Zn, and satisfying 1.0≤x≤1.3, 0≤a≤0.9, 0≤b≤1.0, 0≤c≤0.8, 0≤d≤0.5, a+b+c+d=1, 0.005≤s≤0.3, 0.0005≤t≤0.1, and 0≤u≤0.3, the active material having a crystal structure that belongs to a space group of any one of space croups R3/m, C2/m, and Fm-3m.

2. The active material according to claim 1 , wherein s in the general formula falls within a range 0.01≤s≤0.1.

3. The active material according to claim 1 , wherein t in the general formula falls within a range 0.001≤t≤0.01.

4. The active material according to claim 1 , wherein the active material is in a form of particles, and an amount of Nb and Ta present at a surface of each of the particles is greater than that of Nb and Ta present inside the active material.

5. An electrode comprising the active material according to claim 1 .

6. The electrode according to claim 5 , comprising an active material mixture layer, the active material mixture layer comprising the active material, an electro-conductive agent and a binder.

7. A secondary battery comprising:
a positive electrode, the positive electrode being the electrode according to claim 5 ;
a negative electrode; and
an electrolyte.

8. A battery pack comprising the secondary battery according to claim 7 .

9. The battery pack according to claim 8 , further comprising:
an external power distribution terminal; and
a protective circuit.

10. The battery pack according to claim 8 , comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in a combination of in-series and in-parallel.

11. A vehicle comprising the battery pack according to claim 8 .

12. The vehicle according to claim 11 , wherein the battery pack is configured to recover regenerative energy of motive force of the vehicle.

13. The vehicle according to claim 11 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

14. The active material according to claim 1 , wherein 0≤u≤0.2.

15. The active material according to claim 1 , wherein the crystal structure belongs to the space group R3/m or the space group C2/m.

Assignees

• Toshiba Kk

Inventors

• Sasakawa Tetsuya
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• B60L7/10

  Dynamic electric regenerative braking (B60L7/22 takes precedence) · CPC title

• B60L50/64

  Constructional details of batteries specially adapted for electric vehicles · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title