Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-9543572-B2
Application number	US-201214417975-A
Country	US
Kind code	B2
Filing date	Aug 1, 2012
Priority date	Aug 1, 2012
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

The present invention provides a non-aqueous electrolyte secondary battery that comprises an electrode body comprising a positive electrode and a negative electrode. The positive electrode has an upper operating voltage limit of 4.5 V or higher relative to lithium metal. The electrode body comprises a lithium titanate-containing layer. The lithium titanate-containing layer is isolated from the negative electrode.

First claim

The invention claimed is:

1. A non-aqueous electrolyte secondary battery that comprises an electrode body comprising a positive electrode and a negative electrode, wherein
the positive electrode has an operating voltage of 4.5 V to 5.5 V relative to lithium metal,
the electrode body comprises a lithium titanate-containing layer comprising lithium titanate and a binder, the lithium titanate-containing layer being isolated from the negative electrode,
the lithium titanate-containing layer has a thickness of 5 μm to 15 μm, and
the lithium titanate-containing layer is placed between the positive electrode and the negative electrode,
wherein a separator is placed between the positive electrode and the negative electrode, and the lithium titanate-containing layer is provided above the positive electrode side surface of the separator.

2. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the positive electrode comprises, as a positive electrode active material, a spinel lithium transition metal composite oxide, the lithium transition metal composite oxide comprising at least nickel and manganese as transition metals.

3. The non-aqueous electrolyte secondary battery according to claim 1 , wherein a content of lithium titanate in the lithium titanate-containing layer is 50% by mass to 99.5% by mass.

4. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the non-aqueous electrolyte secondary battery comprises a non-aqueous electrolyte solution containing a fluorinated carbonate.

5. A vehicle comprising the non-aqueous electrolyte secondary according to claim 1 .

6. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the binder is selected from the group consisting of acrylic resin, rubber, polyolefin-based resin, cellulose-based polymer, polyvinyl alcohol, fluorine-based resin, vinyl acetate polymer and polyalkylene oxide.

7. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the binder is selected from the group consisting of acrylic resin, styrene-butadiene rubber, polyolefin-based resin and carboxymethyl cellulose.

8. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the binder comprises a polymer that is dispersible or soluble in an aqueous solvent.

9. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the binder is selected from the group consisting of halogenated vinylic resin, polytetrafluoroethylene, polyacrylonitrile, and polymethyl methacrylate.

10. The non-aqueous electrolyte secondary battery according to claim 1 , wherein the binder comprises a polymer that is dispersible or soluble in an organic solvent.

Assignees

• Toyoshima Ippei
• Toyota Motor Co Ltd

Inventors

• Toyoshima Ippei

Classifications

• H01M50/457

  comprising three or more layers · CPC title

• H01M50/443

  Particulate material · CPC title

• H01M50/451

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

• H01M50/414

  Synthetic resins, e.g. thermoplastics or thermosetting resins · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title