Electricity storage device

Patent metadata

Field	Value
Publication number	US-9590249-B2
Application number	US-98733111-A
Country	US
Kind code	B2
Filing date	Jan 10, 2011
Priority date	Jan 15, 2010
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

An object is to improve characteristics of a power storage device. The present invention relates to an electricity storage device comprising a current collector and a negative electrode-active material layer formed over the current collector. The negative electrode-active material layer includes a negative electrode comprising a first negative electrode layer in contact with the current collector; a second negative electrode layer in contact with the first negative electrode layer, having a smaller capacitance than the first negative electrode layer and containing one material selected from a nitride of lithium and a transition metal represented by Li a M b N z (M is a transition metal, 0.1≦a≦2.8, 0.2≦b≦1 and 0.6≦z≦1.4), a silicon material, and lithium titanate; a positive electrode that is paired with the negative electrode; and a solid electrolyte interposed between the positive electrode and the negative electrode.

First claim

What is claimed is:

1. An electricity storage device comprising:
a current collector in a plate-like form; and
a negative electrode-active material layer formed on the current collector, the negative electrode-active material layer having a laminate structure comprising:
a first negative electrode layer over the current collector, the first negative electrode layer comprising a carbon material or a composite material containing carbon; and
a second negative electrode layer over the first negative electrode layer, the second negative electrode layer containing a nitride of lithium and a transition metal represented by Li a M b N z , where M represents the transition metal, a is 0.1 or more and 2.8 or less, b is 0.2 or more and 1.0 or less, and z is 0.6 or more and 1.4 or less,

wherein the current collector, the first negative electrode layer and the second negative electrode layer are discretely laminated on one another, and
wherein the first negative electrode layer is interposed between the current collector and the second negative electrode layer.

2. An electricity storage device according to claim 1 , wherein the second negative electrode layer has a smaller capacitance than the first negative electrode layer.

3. An electricity storage device according to claim 1 , wherein the second negative electrode layer is made of a material having a smaller volume change than graphite during an insertion-elimination reaction of ions.

4. An electricity storage device comprising:
a current collector in a plate-like form; and
a negative electrode-active material layer formed on and in contact with the current collector, the negative electrode-active material layer having a laminate structure comprising:
a first negative electrode layer comprising graphite; and
a second negative electrode layer over the first negative electrode layer, the second negative electrode layer comprising a nitride of lithium and a transition metal represented by Li a M b N z , where M represents the transition metal, a is 0.1 or more and 2.8 or less, b is 0.2 or more and 1.0 or less, and z is 0.6 or more and 1.4 or less,

wherein the current collector, the first negative electrode layer and the second negative electrode layer are discretely laminated on one another, and
wherein the first negative electrode layer is interposed between the current collector and the second negative electrode layer.

5. An electricity storage device according to claim 4 ,
wherein the second negative electrode layer has a smaller capacitance than the first negative electrode layer.

6. An electricity storage device according to claim 4 , further comprising:
a positive electrode; and
a solid electrolyte interposed between the positive electrode and the negative electrode-active material layer,
wherein the solid electrolyte is a gel electrolyte or a polymer electrolyte.

7. An electricity storage device according to claim 4 , further comprising:
a positive electrode; and
a solid electrolyte interposed between the positive electrode and the negative electrode-active material layer,
wherein the solid electrolyte is in direct contact with the negative electrode-active material layer.

8. An electricity storage device according to claim 4 , wherein the second negative electrode layer is made of a material having a smaller volume change than graphite during an insertion-elimination reaction of ions.

9. An electricity storage device comprising:
a current collector in a plate-like form; and
a negative electrode-active material layer formed on and in contact with the current collector, the negative electrode-active material layer having a laminate structure comprising:
a first negative electrode layer comprising a carbon material or a composite material containing carbon; and
a second negative electrode layer over the first negative electrode layer, the second negative electrode layer comprising a nitride of lithium and a transition metal represented by Li a M b N z , where M represents the transition metal, a is 0.1 or more and 2.8 or less, b is 0.2 or more and 1.0 or less, and z is 0.6 or more and 1.4 or less,

wherein the current collector, the first negative electrode layer and the second negative electrode layer are discretely laminated on one another,
wherein the first negative electrode layer is interposed between the current collector and the second negative electrode layer, and
wherein a thickness of the second negative electrode layer is less than a thickness of the first negative electrode layer.

10. An electricity storage device according to claim 1 , further comprising:
a positive electrode; and
a solid electrolyte interposed between the positive electrode and the negative electrode-active material layer,
wherein the solid electrolyte is a gel electrolyte or a polymer electrolyte.

11. An electricity storage device according to claim 1 , further comprising:
a positive electrode; and
a solid electrolyte interposed between the positive electrode and the negative electrode-active material layer,
wherein the solid electrolyte is in direct contact with the negative electrode-active material layer.

12. An electricity storage device according to claim 1 , further comprising a positive electrode and a dry polymer electrolyte,
wherein the negative electrode-active material layer is between the current collector and the dry polymer electrolyte,
wherein the second negative electrode layer is in direct contact with the dry polymer electrolyte, and
wherein the dry polymer electrolyte is interposed between the negative electrode-active material layer and the positive electrode.

13. An electricity storage device according to claim 4 , further comprising a positive electrode and a dry polymer electrolyte,
wherein the negative electrode-active material layer is between the current collector and the dry polymer electrolyte,
wherein the second negative electrode layer is in direct contact with the dry polymer electrolyte, and
wherein the dry polymer electrolyte is interposed between the negative electrode-active material layer and the positive electrode.

14. An electricity storage device according to claim 9 , further comprising a positive electrode and a dry polymer electrolyte,
wherein the negative electrode-active material layer is between the current collector and the dry polymer electrolyte,
wherein the second negative electrode layer is in direct contact with the dry polymer electrolyte, and
wherein the dry polymer electrolyte is interposed between the negative electrode-active material layer and the positive electrode.

15. An electricity storage device according to claim 1 , wherein the second negative electrode layer comprises a layer of the nitride of lithium and a transition metal represented by Li a M b N z and a layer of a silicon material.

16. An electricity storage device according to claim 1 , wherein the second negative electrode layer comprises a layer of the nitride of lithium and a transition metal represented by Li a M b N z and a layer of a lithium titanate.

17. An electricity storage device according to claim 1 , wherein the second negative electrode layer comprises a layer of the nitride of lithium and a transition metal represented by Li a M b N z , a layer of a silicon material, and a layer of a lithium titanate.

18. The electricity storage device according to claim 1 ,
wherein an active material of the first negative electrode layer is only the carbon material or the composite material containing carbon, and
wherein an active material of the

Assignees

• Moriwaka Tamae
• Takahashi Tatsuya
• Semiconductor Energy Lab

Inventors

• Moriwaka Tamae
• Takahashi Tatsuya

Classifications

• H01M4/58

  of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates · CPC title

• H01M10/0525

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

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title

• H01M4/02

  Electrodes composed of, or comprising, active material · CPC title