Electrode, nonaqueous electrolyte battery, battery pack and vehicle

Patent metadata

Field	Value
Publication number	US-10446829-B2
Application number	US-201715701525-A
Country	US
Kind code	B2
Filing date	Sep 12, 2017
Priority date	Mar 22, 2017
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

According to one embodiment, an electrode is provided. The electrode includes an active material-containing layer. The active material-containing layer includes an Na-containing niobium-titanium composite oxide having an orthorhombic crystal structure. The active material-containing layer satisfies I 2 /I 1 ≥1. I 1 is an intensity of a peak P 1 appearing in a binding energy range of 289 eV to 292 eV in an X-ray photoelectron spectroscopy spectrum of the active material-containing layer. I 2 is an intensity of a peak P 2 appearing in a binding energy range of 283 eV to 285 eV in the X-ray photoelectron spectroscopy spectrum of the active material-containing layer.

First claim

What is claimed is:

1. An electrode comprising:
an active material-containing layer comprising an Na-containing niobium-titanium composite oxide having an orthorhombic crystal structure,
wherein the active material-containing layer satisfies I 2 /I 1 ≥1, where I 1 is an intensity of a peak P 1 appearing in a binding energy range of 289 eV to 292 eV in an X-ray photoelectron spectroscopy spectrum of the active material-containing layer, and I 2 is an intensity of a peak P 2 appearing in a binding energy range of 283 eV to 285 eV in the X-ray photoelectron spectroscopy spectrum.

2. The electrode according to claim 1 , wherein the Na-containing niobium-titanium composite oxide is represented by a general formula of Li 2+v Na 2-w M1 x Ti 6-y-z Nb y M2 z O 14+δ ,
in the general formula;
0≤v≤4, 0<w<2, 0≤x<2, 0<y<2, 0≤z<3, and −0.5≤δ≤0.5;
the M1 is at least one metal element selected from the group consisting of Cs, K, Mg, Sr, Ba and Ca; and
the M2 is at least one metal element selected from the group consisting of Zr, Sn, V, Ta, Mo, W, Fe, Co, Mn and Al.

3. The electrode according to claim 1 , wherein the active material-containing layer satisfies 1≤I 2 /I 1 ≤5.

4. The electrode according to claim 1 , wherein the active material-containing layer satisfies 1≤I 2 /I 1 ≤3.

5. A nonaqueous electrolyte battery comprising:
a negative electrode comprising the electrode according to claim 1 ;
a positive electrode; and
a nonaqueous electrolyte.

6. The nonaqueous electrolyte battery according to claim 5 , wherein the Na-containing niobium-titanium composite oxide is represented by a general formula of Li 2+v Na 2-w M1 x Ti 6-y-z Nb y M2 z O 14+δ ,
in the general formula;
0≤v≤4, 0<w<2, 0≤x<2, 0<y<2, 0≤z<3, and −0.5≤δ≤0.5;
the M1 is at least one metal element selected from the group consisting of Cs, K, Mg, Sr, Ba and Ca; and
the M2 is at least one metal element selected from the group consisting of Zr, Sn, V, Ta, Mo, W, Fe, Co, Mn and Al.

7. The nonaqueous electrolyte battery according to claim 5 , wherein the active material-containing layer satisfies 1≤I 2 /I 1 ≤5.

8. The nonaqueous electrolyte battery according to claim 5 , wherein the active material-containing layer satisfies 1≤I 2 /I 1 ≤3.

9. The nonaqueous electrolyte battery according to claim 5 , wherein the nonaqueous electrolyte comprises ethylene carbonate.

10. A battery pack comprising the nonaqueous electrolyte battery according to claim 5 .

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

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

13. A vehicle comprising the battery pack according to claim 10 .

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

15. The electrode according to claim 1 , wherein the electrode comprises a film comprising C and being formed on the active material-containing layer.

16. The electrode according to claim 1 , wherein the Na-containing niobium-titanium composite oxide is represented by a formula of Li 2 Na 1.5 Ti 5.5 Nb 0.5 O 14 ; a formula of Li 2 Na 1.75 Ti 5.75 Nb 0.25 O 14 ; a formula of Li 2 Na 1.8 Ti 5.8 Nb 0.2 O 14 ; a formula of Li 2 Na 1.4 K 0.1 Ti 5.5 Nb 0.5 O 14 ; a formula of Li 2 Na 1.6 Ti 5.5 Nb 0.4 Zr 0.1 O 14 ; a formula of Li 2 Na 0.2 Ti 4.2 Nb 1.8 O 14 ; a formula of Li 2 Na 1.3 Mg 0.1 Ti 5.5 Nb 0.5 O 14 ; a formula of Li 2 Na 1.3 Ca 0.1 Ti 5.5 Nb 0.5 O 14 ; a formula of Li 2 Na 1.3 Sr 0.1 Ti 5.5 Nb 0.5 O 14 ; a formula of Li 2 Na 1.7 Ti 5.5 Nb 0.4 Al 0.1 O 14 ; or a formula of Li 2 Na 1.4 Ti 5.5 Nb 0.4 Mo 0.1 O 14 .

17. The electrode according to claim 15 , wherein the film comprises a C—C moiety and/or a CH α moiety, where α is 1 to 3.

18. The electrode according to claim 1 , wherein the active material-containing layer satisfies 1≤I 2 /I 1 ≤1.67.

19. The electrode according to claim 2 , wherein the active material-containing layer satisfies 1≤I 2 /I 1 ≤5.

Assignees

• Toshiba Kk

Inventors

• Namiki Yusuke
• Hoshina Keigo
• Harada Yasuhiro
• Takami Norio

Classifications

• H01M4/131 Primary

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

• H01M4/362 Primary

  Composites · CPC title

• C01G33/006

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

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title