All-solid-state lithium-ion secondary battery including a solid electrolyte and an intermediate layer

Patent metadata

Field	Value
Publication number	US-2016351950-A1
Application number	US-201615158630-A
Country	US
Kind code	A1
Filing date	May 19, 2016
Priority date	May 26, 2015
Publication date	Dec 1, 2016
Grant date	—

Abstract

An all-solid-state lithium-ion secondary battery includes a cathode active material, an anode active material, a solid electrolyte between the cathode and anode active materials, and an intermediate layer between the solid electrolyte and the cathode active material. The cathode and anode active materials are able to store and release a lithium ion. The solid electrolyte has lithium ion conductivity. The intermediate layer is constituted of elements including all elements constituting the cathode active material. A lithium ion in the intermediate layer is less ionic than that in the cathode active material.

First claim

What is claimed is:

1 . An all-solid-state lithium-ion secondary battery comprising:
a cathode active material that allows a lithium ion to be stored therein and released therefrom; an anode active material that allows a lithium ion to be stored therein and released therefrom; a solid electrolyte between the cathode active material and the anode active material, the solid electrolyte having lithium ion conductivity; and an intermediate layer between the solid electrolyte and the cathode active material, the intermediate layer being constituted of elements including all elements constituting the cathode active material, a lithium ion in the intermediate layer being less ionic than the lithium ion stored in the cathode active material.

2 . The all-solid-state lithium-ion secondary battery according to claim 1 , wherein:
the cathode active material is lithium cobalt oxide.

3 . The all-solid-state lithium-ion secondary battery according to claim 2 , wherein:
in an electron energy loss spectrum of the intermediate layer, an energy level at which a Li K-edge rises is lower than an energy level at which a Co M 2,3 -edge rises by 1 eV or more.

4 . The all-solid-state lithium-ion secondary battery according to claim 1 , wherein:
the elements constituting the intermediate layer exclude any element constitutive of the solid electrolyte but not constitutive of the cathode active material.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Ohuchi Satoru
• Sugimoto Yuta
• Kume Toshiro
• Yokoyama Tomoyasu

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M10/0525 Primary

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

• H01M4/624

  Electric conductive fillers · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title