Electrode construct, electrode group, secondary battery, battery pack, vehicle, and stationary power supply

Patent metadata

Field	Value
Publication number	US-11769932-B2
Application number	US-202117187714-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Sep 14, 2020
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

According to one embodiment, an electrode construct including an electrode and a composite membrane is provided. The electrode includes an active material-containing layer and a current collecting layer. The active material-containing layer includes a first principal surface and a second principal surface. The current collecting layer is in contact with the second principal surface. The composite membrane includes a composite layer in contact with the first principal surface. The composite layer contains inorganic solid particles and a polymeric material. A peel strength σ1 at a first interface between the active material-containing layer and the composite layer and a peel strength σ2 at a second interface between the active material-containing layer and the current collecting layer satisfy a relationship of σ1>σ2, and σ2≤1 N/cm.

First claim

What is claimed is:

1. An electrode construct, comprising:
an electrode comprising an active material-containing layer and a current collecting layer, the active material-containing layer comprising a first principal surface and a second principal surface on a reverse side to the first principal surface, and the current collecting layer being in contact with the second principal surface of the active material-containing layer; and
a composite membrane comprising a composite layer, the composite layer comprising inorganic solid particles and a polymeric material, and the composite layer being in contact with the first principal surface of the active material-containing layer,
a peel strength σ1 at a first interface between the active material-containing layer and the composite layer, and a peel strength σ2 at a second interface between the active material-containing layer and the current collecting layer satisfying a relationship of σ1>σ2, the peel strength σ1 satisfying σ1≥1.5 N/cm, and the peel strength σ2 satisfying σ2≤1 N/cm.

2. The electrode construct according to claim 1 , wherein the peel strength σ1 exhibits diminishment of 100% or more at 10% or less per 1 mm length along the first interface.

3. The electrode construct according to claim 1 , wherein a conjugate of the composite membrane and the active material-containing layer has a coefficient of air permeability of 1×10 −15 m 2 or less.

4. The electrode construct according to claim 1 , wherein the peel strength σ1 and the peel strength σ2 satisfy a relationship of σ1>10×σ2.

5. The electrode construct according to claim 1 , wherein the composite membrane further comprises a substrate layer, the substrate layer comprises a nonwoven fabric or a self-supporting porous film, and the substrate layer is in contact with the composite layer.

6. The electrode construct according to claim 1 , wherein the inorganic solid particles comprise solid electrolyte particles having ion conductivity of alkali metal ions.

7. The electrode construct according to claim 1 , wherein the inorganic solid particles comprise at least one selected from the group consisting of a compound represented by Li 1+w Al w Ti 2−w (PO 4 ) 3 where 0.1≤w≤0.5, a compound represented by Li 1+y Al z M1 2−z (PO 4 ) 3 where M1 is one or more selected from the group consisting of Ti, Ge, Sr, Zr, Sn, and Ca, 0≤y≤1, and 0≤z≤1, and a compound represented by Li 5+x La 3 M2 2−x Zr x O 12 where M2 is one or more selected from the group consisting of Nb and Ta, and 0≤x≤2.

8. The electrode construct according to claim 1 , wherein the polymeric material comprises a monomer unit composed of a hydrocarbon having a functional group containing one or more selected from the group consisting of oxygen (O), sulfur (S), nitrogen (N), and fluorine (F), and a proportion in the polymeric material occupied by the monomer unit is 70 mol % or more.

9. The electrode construct according to claim 8 , wherein the functional group of the monomer unit comprises one or more selected from the group consisting of a formal group, a butyral group, a carboxymethyl ester group, an acetyl group, a carbonyl group, a hydroxyl group, and a fluoro group.

10. The electrode construct according to claim 1 , wherein the active material-containing layer comprises a first electrode active material, the first electrode active material comprising a compound having a lithium ion insertion-extraction potential of 1 V to 3 V (vs. Li/Li + ) with respect to the oxidation-reduction potential of lithium.

11. An electrode group comprising:
the electrode construct according to claim 1 ; and
a counter electrode with respect to the electrode.

12. The electrode group according to claim 11 , wherein the counter electrode comprises a second electrode active material, the second electrode active material comprising a compound having a lithium ion insertion-extraction potential of 2.5 V to 5.5 V (vs. Li/Li + ) with respect to the oxidation-reduction potential of lithium.

13. A secondary battery comprising:
the electrode group according to claim 11 ; and
an aqueous electrolyte comprising water.

14. A battery pack comprising the secondary battery according to claim 13 .

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

16. The battery pack according to claim 14 , which comprises plural of the secondary battery, wherein the plural of the secondary battery are electrically connected in series, in parallel, or in combination of series and parallel.

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

18. The vehicle according to claim 17 , which comprises a mechanism configured to convert kinetic energy of the vehicle into regenerative energy.

19. A stationary power supply comprising the battery pack according to claim 14 .

Assignees

• Toshiba Kk

Inventors

• Hotta Yasuyuki
• Sekiguchi Yumiko
• Matsuno Shinsuke

Classifications

• H01M50/46 Primary

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M4/502

  for non-aqueous cells (H01M4/505 takes precedence) · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M10/0525 Primary

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