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

Patent metadata

Field	Value
Publication number	US-10439218-B2
Application number	US-201715692685-A
Country	US
Kind code	B2
Filing date	Aug 31, 2017
Priority date	Mar 24, 2017
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

According to one embodiment, there is provided an active material including particles of a composite oxide having an orthorhombic crystal structure and represented by the general formula Li 2+w Na 2−x M1 y Ti 6−z M2 z O 14−δ . The particles of the composite oxide have an average crystallite size of 50 nm to 90 nm and an average primary particle size of 0.1 μm to 0.6 μm. M1 is at least one selected from the group consisting of Cs and K. M2 is at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Y, Co, Mn, and Al. w falls within 0≤w≤4, x falls within 0<x<2, y falls within 0≤y<2, z falls within 0<z<6, and δ falls within −0.5≤δ≤0.5.

First claim

What is claimed is:

1. An active material comprising particles of a composite oxide, the composite oxide having an orthorhombic crystal structure, being represented by a general formula Li 2+w Na 2−x M1 y Ti 6−z M2 z O 14+δ , and having an average crystallite size of 50 nm to 90 nm and an average primary particle size of 0.1 μm to 0.6 μm,
wherein M1 is at least one selected from the group consisting of Cs and K, M2 is at least one selected from the group consisting of Zr, Sn, V, Nb, Ta, Mo, W, Fe, Y, Co, Mn, and Al, w falls within 0≤w≤4, x falls within 0<x<2, y falls within 0≤y<2, z falls within 0<z<6, and δ falls within −0.5≤δ≤0.5.

2. The active material according to claim 1 , wherein M2 is at least one cation selected from the group consisting of Fe, Y, Co, Mn, and Al as trivalent cations, Zr and Sn as tetravalent cations, V, Nb, and Ta as pentavalent cations, and Mo and W as hexavalent cations.

3. The active material according to claim 1 , wherein the orthorhombic crystal structure belongs to a space group Fmmm, and M2 is at least one selected from the group consisting of V, Nb, and Ta as pentavalent cations.

4. The active material according to claim 1 , wherein a value (nm) of the average crystallite size of the particles of the composite oxide is equal to or greater than ⅓ a value (nm) of the average primary particle size.

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

6. The electrode according to claim 5 , further comprising an active material-containing layer that comprises the active material.

7. The electrode according to claim 6 , wherein the active material-containing layer further comprises an electro-conductive agent and a binder.

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

9. A battery pack comprising the secondary battery ( 100 ) according to claim 8 .

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

11. The battery pack according to claim 9 , comprising plural of the secondary batteries, the secondary batteries being electrically connected in series, in parallel, or in a combination of in series and in parallel.

12. A vehicle comprising the battery pack according to claim 9 .

13. The vehicle according to claim 12 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

Assignees

• Toshiba Kk

Inventors

• Tejima Fumihiro
• Harada Yasuhiro
• Ise Kazuki
• Takami Norio

Classifications

• H01M50/204

  Racks, modules or packs for multiple batteries or multiple cells · CPC title

• C01P2004/03

  obtained by SEM · CPC title

• C01P2006/12

  Surface area · CPC title

• C01G23/005

  Alkali titanates · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title