Solid electrolyte, all-solid-state lithium-ion secondary battery, production method for solid electrolyte

Patent metadata

Field	Value
Publication number	US-10964974-B2
Application number	US-201816126182-A
Country	US
Kind code	B2
Filing date	Sep 10, 2018
Priority date	Mar 16, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A solid electrolyte is constituted by lithium phosphorus oxynitride (LiPON). A multiplication value obtained by multiplying a ratio of a peak intensity of nitrogen atoms having a single bond with one P atom and having a double bond with another P atom to a peak intensity of an N 2 state in a Raman spectroscopy spectrum by a ratio of a content amount of N atoms to a content amount of P atoms is greater than or equal to 0.40.

First claim

The invention claimed is:

1. A solid electrolyte comprising lithium phosphorus oxynitride,
wherein a multiplication value obtained by multiplying a ratio of a peak intensity of nitrogen atoms having a single bond with one P atom and having a double bond with another P atom to a peak intensity of an N 2 state in a Raman spectroscopy spectrum by a ratio of a content amount of N atoms to a content amount of P atoms is greater than or equal to 0.40.

2. The solid electrolyte according to claim 1 ,
wherein a ratio of an atomic percentage of N atoms to an atomic percentage of P atoms in the lithium phosphorus oxynitride is greater than or equal to 0.15.

3. The solid electrolyte according to claim 1 ,
wherein a ratio of an atomic percentage of Li atoms to an atomic percentage of P atoms in the lithium phosphorus oxynitride is less than or equal to 3.1.

4. The solid electrolyte according to claim 1 , wherein a ratio of peak intensity of POP to a peak intensity of PO in the Raman spectroscopy spectrum of the lithium phosphorus oxynitride is greater than or equal to 1.20.

5. An all-solid-state lithium-ion secondary battery comprising:
a positive electrode,
a negative electrode, and
a solid electrolyte according to claim 1 , wherein
the solid electrolyte is disposed between the positive electrode and the negative electrode.

6. The all-solid-state lithium-ion secondary battery according to claim 5 , wherein the positive electrode is configured by Li x CoO 2 , and wherein 0.05<x<1.10.

7. The all-solid-state lithium-ion secondary battery according to claim 5 , wherein the negative electrode contains lithium metal as a main component.

8. A method of producing a solid electrolyte comprising:
a step of forming lithium phosphorus oxynitride by use of a facing target RF sputtering method, wherein

a chamber internal pressure during sputtering is less than or equal to 1 Pa in the step of forming the lithium phosphorus oxynitride, and
wherein a multiplication value obtained by multiplying a ratio of a peak intensity of nitrogen atoms having a single bond with one P atom and having a double bond with another P atom to a peak intensity of an N 2 state in a Raman spectroscopy spectrum by a ratio of a content amount of N atoms to a content amount of P atoms is greater than or equal to 0.40.

Assignees

• Ngk Insulators Ltd

Inventors

• Kojima Miyuki
• Sato Yosuke
• Katsuda Yuji
• Nagasawa Yoshiaki
• Kaigawa Kazuyuki

Classifications

• Y02P70/50

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

• H01B1/08

  oxides · CPC title

• C23C14/352

  using more than one target (C23C14/56 takes precedence) · CPC title

• C01B21/097

  containing phosphorus atoms · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title