Non-aqueous electrolyte secondary battery and storage circuit using the same

Patent metadata

Field	Value
Publication number	US-2016233504-A1
Application number	US-201615134915-A
Country	US
Kind code	A1
Filing date	Apr 21, 2016
Priority date	Nov 7, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

A non-aqueous electrolyte secondary battery that includes a positive electrode having a positive electrode active material layer and a positive electrode current collector; a negative electrode having a negative electrode active material layer and a negative electrode current collector; a separator interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte solution, which are enclosed in an exterior material. The positive electrode active material layer includes a lithium transition metal oxide having a layered crystal structure, and the negative electrode active material layer includes a lithium titanium oxide having a spinel-type crystal structure, and having a thickness of 20.0 μm or more and 33.4 μm or less. A ratio (R) between the thickness of the positive electrode active material layer and the thickness of the negative electrode active material layer is 0.59≦(R)≦1.50 or 0.59≦(R)≦1.14.

First claim

1 . A non-aqueous electrolyte secondary battery comprising:
a positive electrode having a positive electrode active material layer and a positive electrode current collector; a negative electrode having a negative electrode active material layer and a negative electrode current collector; a separator interposed between the positive electrode and the negative electrode; a non-aqueous electrolyte solution; and an exterior material enclosing the positive electrode, the negative electrode, the separator and the non-aqueous electrolyte solution, wherein: the positive electrode active material layer comprises a lithium transition metal oxide having a layered crystal structure; the negative electrode active material layer comprises a lithium titanium oxide having a spinel-type crystal structure, and a thickness of 20.0 μm or more and 33.4 μm or less; and a ratio between a thickness of the positive electrode active material layer and the thickness of the negative electrode active material is 0.59≦(thickness of positive electrode active material layer/thickness of negative electrode active material layer)≦1.50.

2 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein the lithium transition metal oxide is a lithium composite oxide.

3 . The non-aqueous electrolyte secondary battery according to claim 2 , wherein the lithium composite oxide is one of LiCoO 2 and LiCo 1/3 Ni 1/3 Mn 1/3 O 2 .

4 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein the separator is a porous material.

5 . The non-aqueous electrolyte secondary battery according to claim 4 , wherein the porous material is polyamideimide.

6 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein the electrolyte solution is selected from LiPF 6 , LiBF 4 , LiTFSI, and mixtures thereof, dissolved in an organic solvent.

7 . The non-aqueous electrolyte secondary battery according to claim 6 , wherein the organic solvent is selected from the group consisting of dimethyl carbonate, diethyl carbonate, methylethyl carbonate, propylene carbonate, acetonitrile, ethyl propionate, methyl propionate, and mixtures thereof.

8 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein the electrolyte solution comprises an electrolyte dissolved in an ionic liquid.

9 . The non-aqueous electrolyte secondary battery according to claim 8 , wherein the ionic liquid is selected from the group consisting of 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3methylimidazolium bis(trifluoromethane sulfonyl), and mixtures thereof.

10 . A storage circuit comprising:
the non-aqueous electrolyte secondary battery according to claim 1 ; and an electric double layer capacitor connected in parallel to the non-aqueous electrolyte secondary battery.

11 . A non-aqueous electrolyte secondary battery comprising:
a positive electrode having a positive electrode active material layer and a positive electrode current collector; a negative electrode having a negative electrode active material layer and a negative electrode current collector; a separator interposed between the positive electrode and the negative electrode; a non-aqueous electrolyte solution; and an exterior material enclosing the positive electrode, the negative electrode, the separator and the non-aqueous electrolyte solution, wherein: the positive electrode active material layer comprises a lithium transition metal oxide having a layered crystal structure; the negative electrode active material layer comprises a lithium titanium oxide having a spinel-type crystal structure, and having a thickness of 25.0 μm or more and 33.4 μm or less; and a ratio between a thickness of the positive electrode active material layer and the thickness of the negative electrode active material layer is 0.59≦(thickness of positive electrode active material layer/thickness of negative electrode active material layer)≦1.14.

12 . The non-aqueous electrolyte secondary battery according to claim 11 , wherein the lithium transition metal oxide is a lithium composite oxide.

13 . The non-aqueous electrolyte secondary battery according to claim 12 , wherein the lithium composite oxide is one of LiCoO 2 and LiCo 1/3 Ni 1/3 Mn 1/3 O 2 .

14 . The non-aqueous electrolyte secondary battery according to claim 11 , wherein the separator is a porous material.

15 . The non-aqueous electrolyte secondary battery according to claim 14 , wherein the porous material is polyamideimide.

16 . The non-aqueous electrolyte secondary battery according to claim 11 , wherein the electrolyte solution is selected from LiPF 6 , LiBF 4 , LiTFSI, and mixtures thereof, dissolved in an organic solvent.

17 . The non-aqueous electrolyte secondary battery according to claim 16 , wherein the organic solvent is selected from the group consisting of dimethyl carbonate, diethyl carbonate, methylethyl carbonate, propylene carbonate, acetonitrile, ethyl propionate, methyl propionate, and mixtures thereof.

18 . The non-aqueous electrolyte secondary battery according to claim 11 , wherein the electrolyte solution comprises an electrolyte dissolved in an ionic liquid.

19 . The non-aqueous electrolyte secondary battery according to claim 18 , wherein the ionic liquid is selected from the group consisting of 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3methylimidazolium bis(trifluoromethane sulfonyl), and mixtures thereof.

20 . A storage circuit comprising:
the non-aqueous electrolyte secondary battery according to claim 11 ; and an electric double layer capacitor connected in parallel to the non-aqueous electrolyte secondary battery.

Assignees

• Murata Manufacturing Co

Inventors

• Itaya Masaharu

Classifications

• H01G11/08

  Structural combinations, e.g. assembly or connection, of hybrid or EDL capacitors with other electric components, at least one hybrid or EDL capacitor being the main component · CPC title

• H01M16/00

  Structural combinations of different types of electrochemical generators · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title