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

Patent metadata

Field	Value
Publication number	US-2018277841-A1
Application number	US-201715692129-A
Country	US
Kind code	A1
Filing date	Aug 31, 2017
Priority date	Mar 22, 2017
Publication date	Sep 27, 2018
Grant date	—

Abstract

According to one embodiment, an active material including a composite oxide is provided. The composite oxide has a monoclinic crystal structure and is represented by the general formula Li w M1 2−x Ti 8−y M2 z O 17+δ , wherein: M1 is at least one selected from the group consisting of Cs, K, and Na; M2 is at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al;
0≤w≤10; 0<x<2; 0<y<8; 0<z<8;

and −0.5≤δ≤0.5.

First claim

What is claimed is:

1 . An active material comprising a composite oxide, the composite oxide having a monoclinic crystal structure and represented by a general formula Li w M1 2−x Ti 8−y M2 z O 17+δ , wherein:
M1 is at least one selected from the group consisting of Cs, K, and Na; M2 is at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Co, Mn, and Al; 0≤w≤10; 0<x<2; 0<y<8; 0<z<8;
and −0.5≤δ≤0.5.

2 . The active material according to claim 1 , wherein M1 comprises K or Na, and M2 is at least one selected from the group consisting of V, Nb, Ta, and Mo.

3 . The active material according to claim 1 , wherein M2 is Nb.

4 . The active material according to claim 1 , wherein the monoclinic crystal structure belongs to a space group C2/m, and a plane distance d 200 corresponding to a (200) plane is 7.5 Å≤d 200 ≤8.5 Å, in a X-ray diffraction profile according to a powder X-ray diffraction method using Cu-Kα rays.

5 . The active material according to claim 4 , wherein the composite oxide comprises nanotube-form or nanowire-form particles grown along a [010] direction.

6 . The active material according to claim 1 , wherein the composite oxide is represented by a general formula Li w K 2−x Ti 8−y Nb z O 17+δ .

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

8 . The electrode according to claim 7 , wherein the electrode comprises an active material-containing layer comprising the active material.

9 . The electrode according to claim 8 , wherein the active material-containing layer further comprises an electro-conductive agent and a binder.

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

11 . A battery pack comprising the secondary battery according to claim 10 .

12 . The battery pack according to claim 11 , further comprising:
an external power distribution terminal; and a protective circuit.

13 . The battery pack according to claim 11 , comprising plural of the secondary battery, the secondary batteries being electrically connected in series, in parallel, or in a combination of in a series and in parallel.

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

15 . The vehicle according to claim 14 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Harada Yasuhiro
• Takami Norio

Classifications

• C01G23/005

  Alkali titanates · CPC title

• C01G33/006

  Compounds containing niobium, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C01P2006/12

  Surface area · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title