Solid electrolyte and all-solid state lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-9853322-B2
Application number	US-201414454215-A
Country	US
Kind code	B2
Filing date	Aug 7, 2014
Priority date	Aug 9, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

In a Li ion conductivity oxide solid electrolyte containing lithium, lanthanum, and zirconium, a part of oxygen is substituted by an element M (M=N, Cl, S, Se, or Te) having smaller electronegativity than oxygen.

First claim

What is claimed is:

1. A solid electrolyte for a lithium ion secondary battery having a composition formula expressed by Li 7+x La 3 Zr 2 O 12−x N x ,
wherein 0<x <1.2, and a composition ratio of nitrogen (N) to oxygen (O) is in a range from 0.1% to 10%.

2. The solid electrolyte for lithium ion secondary battery according to claim 1 , wherein the solid electrolyte for lithium ion secondary battery is expressed by a chemical composition formula Li 7+x−3y A y La 3 Zr 2 O 12−x N x (A is at least one type of Al and Ga in the formula, and 0<x<1.2) in which lithium in a crystal structure is substituted by A.

3. A lithium ion secondary battery comprising:
a positive electrode configured to store and/or release lithium ions;
a negative electrode configured to store and/or release lithium ions, wherein
the solid electrolyte for lithium ion secondary battery according to claim 1 is disposed between the positive electrode and the negative electrode.

4. A method of manufacturing the solid electrolyte for lithium ion secondary battery according to claim 1 , wherein a metal salt having Nitrogen or N as a constituent element is at least included in a raw material, and the solid electrolyte is obtained by being subjected to thermal treatment in a gas atmosphere containing a compound having Nitrogen or N as a constituent element at a time of synthesis.

5. The method of manufacturing the solid electrolyte for lithium ion secondary battery according to claim 4 , wherein the compound is ammonia (NH 3 ).

Assignees

• Hitachi Ltd

Inventors

• Kawaji Jun
• Yamaki Takahiro

Classifications

• H01M10/0562 Primary

  Solid materials · CPC title

• Y02T10/7011

  Cross-Sectional Technologies · mapped topic

• H01M2300/0071

  Oxides · CPC title

• H01M10/052

  Li-accumulators · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title