Positive electrode mixture and all-solid-state lithium sulfur cell

Patent metadata

Field	Value
Publication number	US-9865873-B2
Application number	US-201414896201-A
Country	US
Kind code	B2
Filing date	Mar 19, 2014
Priority date	Jun 21, 2013
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

The present invention aims to maximize the advantageous physical properties of sulfur and provide a cathode mixture that can be suitably used in a cathode mixture layer of an all-solid-state lithium sulfur battery exhibiting excellent charge/discharge capacity. The present invention also aims to provide an all-solid-state lithium sulfur battery including a cathode mixture layer containing the cathode mixture. The present invention provides a cathode mixture for use in a cathode mixture layer of an all-solid-state lithium sulfur battery, the cathode mixture containing: (A) an ion-conductive material containing phosphorus at a weight ratio of 0.2 to 0.55; (B) sulfur and/or its discharge product (B); and (C) a conductive material, the amount of the component (B) being 40% by weight or more of the total amount of the components (A), (B), and (C).

First claim

The invention claimed is:

1. A cathode mixture for use in a cathode mixture layer of an all-solid-state lithium sulfur battery, the cathode mixture consisting essentially of:
(A) an ion-conductive material containing phosphorus at a weight ratio of 0.2 to 0.55;
(B) sulfur and/or its discharge product; and
(C) a conductive material,
the amount of the component (B) being 40% by weight or more of the total amount of the components (A), (B), and (C).

2. The cathode mixture according to claim 1 , wherein the ion-conductive material (A) is P x S y where x and y independently represent integers that give a stoichiometric ratio, and/or a composite of Li, S, and P.

3. The cathode mixture according to claim 2 , wherein the composite of Li, S, and P is obtained by mechanically milling at least Li 2 S, S, and P, or at least Li 2 S and P x S y where x and y independently represent integers that give a stoichiometric ratio.

4. The cathode mixture according to claim 1 , wherein the ion-conductive material (A), the sulfur and/or its discharge product (B), and the conductive material (C) are present at a ratio (component (A):component (B):component (C)) of 10-50:40-70:5-25 by weight.

5. An all-solid-state lithium sulfur battery, comprising:
a cathode mixture layer comprising the cathode mixture according to claim 1 ;
a solid electrolyte layer;
an anode; and
a collector.

Assignees

• Nagase Chemtex Corp

Inventors

• Nagata Hiroshi
• Chikusa Yasuo

Classifications

• H01M4/5815 Primary

  Sulfides · CPC title

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• H01M4/38

  of elements or alloys · CPC title

• H01M10/0562

  Solid materials · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title