Electrode group, nonaqueous electrolyte secondary battery, battery pack, and vehicle

Patent metadata

Field	Value
Publication number	US-11605807-B2
Application number	US-202016804320-A
Country	US
Kind code	B2
Filing date	Feb 28, 2020
Priority date	Sep 19, 2019
Publication date	Mar 14, 2023
Grant date	Mar 14, 2023

Abstract

According to one embodiment, an electrode group is provided. The electrode group includes a positive electrode that includes a lithium composite oxide LiM x Mn 2-x O 4 (0<x≤0.5, M is at least one selected from a group consisting of Ni, Cr, Fe, Cu, Co, Mg, and Mo) as a positive electrode active material, a negative electrode that includes a negative electrode active material, a composite electrolyte layer that includes at least one of a solid electrolyte and an inorganic compound containing alumina, and a separator. The composite electrolyte layer and the separator are arranged between the positive electrode and the negative electrode. A density of the composite electrolyte layer is in the range of 1.0 g/cc and 2.2 g/cc.

First claim

What is claimed is:

1. An electrode group comprising:
a positive electrode comprising a lithium composite oxide LiM x Mn 2-x O 4 (0<x≤0.5, M is at least one selected from a group consisting of Ni, Cr, Fe, Cu, Co, Mg, and Mo) as a positive electrode active material;
a negative electrode comprising a negative electrode active material;
a composite electrolyte layer comprising at least one of a solid electrolyte and an inorganic compound containing alumina; and
a separator,
wherein
the composite electrolyte layer and the separator are arranged between the positive electrode and the negative electrode, and
a density of the composite electrolyte layer is in a range of 1.0 g/cc to 2.2 g/cc, and is substantially consistent within the composite electrolyte layer.

2. The electrode group according to claim 1 , wherein
the density of the composite electrolyte layer is in a range of 1.3 g/cc to 1.5 g/cc.

3. The electrode group according to claim 1 , wherein
a thickness of the composite electrolyte layer is in a range of 0.1 μm to 100 μm.

4. The electrode group according to claim 1 , wherein
a thickness of the composite electrolyte layer is in a range of 1 μm to 20 μm.

5. The electrode group according to claim 1 , wherein
the solid electrolyte is in a form of particles, and an average particle size of the solid electrolyte is in a range of 0.1 μm to 10 μm.

6. The electrode group according to claim 5 , wherein
the average particle size of the solid electrolyte is in a range of 0.1 μm to 5 μm.

7. The electrode group according to claim 1 , wherein
the solid electrolyte comprises at least one selected from a group consisting of perovskite-type lithium lanthanum titanium composite oxide, garnet-type lithium lanthanum zirconium-containing oxide, NASICON-type lithium aluminum titanium composite oxide, lithium calcium zirconium oxide, and an inorganic compound having a LISICON structure.

8. The electrode group according to claim 1 , wherein
the inorganic compound containing alumina is alumina.

9. The electrode group according to claim 1 , wherein
the positive electrode active material has a discharging potential of 4.5 V (vs Li/Li + ) or greater.

10. The group acct to claim 1 , wherein the negative electrode active material comprises a titanium composite oxide.

11. The electrode group according to claim 10 , wherein
the titanium composite oxide comprises at least one selected from a group consisting of lithium titanium oxide, titanium oxide, niobium titanium oxide, and lithium sodium niobium titanium oxide.

12. A nonaqueous electrolyte secondary battery comprising:
the electrode group according to claim 1 ; and
a nonaqueous electrolyte.

13. A battery pack comprising the nonaqueous electrolyte secondary battery according to claim 12 .

14. The battery pack according to claim 13 further comprising:
an external power distribution terminal; and
a protective circuit.

15. The battery pack according to claim 13 comprising a plurality of the nonaqueous electrolyte secondary battery, wherein
the nonaqueous electrolyte secondary batteries are electrically connected in series, in parallel, or in series and parallel.

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

17. The vehicle according to claim 16 , wherein
the battery pack is configured to recover a regenerative energy of a power of the vehicle.

18. The electrode group according to claim 1 , wherein there is no portion having a density distribution in the composite electrolyte layer beyond the density range of 1.0 g/cc to 2.2 g/cc.

19. The electrode group according to claim 1 , wherein the composite electrolyte layer is an alumina layer.

Assignees

• Toshiba Kk

Inventors

• Yamada Arisa
• Yamashita Yasunobu
• Matsuno Shinsuke

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/0525

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

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M4/463

  Aluminium based · CPC title