Lithium-rich antiperovskite compound, lithium secondary battery electrolyte comprising same, and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-10680282-B2
Application number	US-201716093332-A
Country	US
Kind code	B2
Filing date	Sep 21, 2017
Priority date	Sep 30, 2016
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

The present invention relates to a Li-rich antiperovskite compound and the use thereof, and more particularly, to a Li-rich antiperovskite compound having a novel structure in which a dopant is substituted in a Li3OCl compound, wherein the dopant is substituted for an O site rather than an anionic Cl site, as known in the art, and an electrolyte using the same. The Li-rich antiperovskite compound has high lithium ion conductivity and excellent thermal stability, and thus can be applied as an electrolyte for lithium secondary batteries which are driven at a high temperature.

First claim

The invention claimed is:

1. A compound having a lithium-rich antiperovskite (LiRAP) crystal structure represented by the following Formula 1, 2 or 3:
Li 3-x ClO 1-x Hal x   [Formula 1]

wherein Hal is F, Cl, Br, or I, and x is 0<x<1;
Li 3-y-x M y O 1-x Hal x Cl  [Formula 2]

wherein M is Na, K, Rb, or Cs, Hal is F, Cl, Br, or I, and x and y are 0<x<1 and 0<y<2;
Li 3-2y-x M y O 1-x Hal x Cl  [Formula 3]

wherein M is Mg, Ca, Sr, or Ba, Hal is F, Cl, Br, or I, and x and y are 0<x<1 and 0<y<1.

2. The compound of claim 1 , wherein the compound has an ion conductivity of 10 to 10 −10 S/cm.

3. An electrolyte for lithium secondary batteries comprising the compound having a lithium-rich antiperovskite (LiRAP) crystal structure represented by the following Formula 1, 2 or 3:
Li 3-x ClO 1-x Hal x   [Formula 1]

wherein Hal is F, Cl, Br, or I, and x is 0<x<1;
Li 3-y-x M y O 1-x Hal x Cl  [Formula 2]

wherein M is Na, K, Rb, or Cs, Hal is F, Cl, Br, or I, and x and y are 0<x<1 and 0<y<2;
Li 3-2y-x M y O 1-x Hal x Cl  [Formula 3]

wherein M is Mg, Ca, Sr, or Ba, Hal is F, Cl, Br, or I, and x and y are 0<x<1 and 0<y<1.

4. The electrolyte of claim 3 , wherein the compound has an ion conductivity of 10 to 10 −10 S/cm.

5. A lithium secondary battery comprising the electrolyte for lithium secondary batteries defined in claim 3 .

6. The lithium secondary battery of claim 5 , wherein the lithium secondary battery comprises one selected from a lithium-air battery, a lithium oxide battery, a lithium-sulfur battery, a lithium metal battery, and an all-solid-state battery.

Assignees

• Lg Chemical Ltd

Inventors

• Park Se Ho
• Chung Chanyeup
• Sung Da Young
• Jang Minchul
• Park Eunkyung
• Park Changhun

Classifications

• H01M10/0585

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

• C01P2002/54

  one element only · CPC title

• H01M10/0562 Primary

  Solid materials · CPC title

• C01P2002/72

  by d-values or two theta-values, e.g. as X-ray diagram · CPC title

• H01M2300/0071

  Oxides · CPC title