Sulfide solid electrolyte glass, method for producing sulfide solid electrolyte glass, and lithium solid state battery

• US 8,993,176 B2
• Filed: 07/22/2010
• Issued: 03/31/2015
• Est. Priority Date: 07/22/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Kato, Yuki, Kawamoto, Koji, Hama, Shigenori, Otomo, Takamasa
• Primary Examiner(s): Ryan, Patrick
• Assistant Examiner(s): COLUCCI RIOS, JOSE A
• Application Number:
  US13/811,052
• Publication Number:
  US 20130164632A1
• Time in Patent Office: 1,713 Days
• Field of Search: None
• US Class Current: 429/322
• CPC Class Codes: C03B 19/00 Other methods of shaping glass manufacture or treatment of flakes, fibres or filaments from softened glass, minerals or slags C03B37/00
• CPC Class Codes: C03B 2201/86 Chalcogenide glasses, i.e. S, Se or Te glasses
• CPC Class Codes: C03C 14/006 the non-glass component being in the form of microcrystallites, e.g. of optically or electrically active material
• CPC Class Codes: C03C 2214/16 Microcrystallites, e.g. of optically or electrically active material
• CPC Class Codes: C03C 3/321 Chalcogenide glasses, e.g. containing S, Se, Te
• CPC Class Codes: H01B 1/122 Ionic conductors
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An object of the present invention is to provide a sulfide solid electrolyte glass producing a tiny amount of hydrogen sulfide. The present invention attains the above-mentioned object by providing a sulfide solid electrolyte glass including Li₃PS₄, characterized in that Li₄P₂S₇ is not detected by ³¹P NMR measurement and the content of Li₂S as determined by XPS measurement is 3% by mol or less.

Claims

1. A sulfide solid electrolyte glass comprising Li₃PS₄, wherein Li₄P₂S₇ is not detected by ³¹P NMR measurement and a content of Li₂S as determined by XPS measurement is 3% by mol or less.

2. The sulfide solid electrolyte glass according to claim 1, wherein the content of Li₂S as determined by XPS measurement is 1% by mol or less.

6. A lithium solid state battery comprising a cathode active material layer containing a cathode active material, an anode active material layer containing an anode active material, and a solid electrolyte layer formed between the cathode active material layer and the anode active material layer;

wherein at least one of the cathode active material layer, the anode active material layer and the solid electrolyte layer contains the sulfide solid electrolyte glass according to claim 1.

7. The sulfide solid electrolyte glass according to claim 1, wherein the sulfide solid electrolyte glass is produced from a raw material composition containing Li₂S and P₂S₅ at a molar ratio of xLi₂S.(100-x) P₂S₅ where x satisfies 73<

x<

75.

8. The sulfide solid electrolyte glass according to claim 1, wherein the sulfide solid electrolyte glass has a hydrogen sulfide concentration in the range of 10 ppm or less.

3. A method for producing a sulfide solid electrolyte glass comprising Li₃PS₄, comprising:

preparing a raw material composition containing Li₂S and P₂S₅; and

amorphizing the raw material composition by an amorphization treatment,

wherein the raw material composition contains Li₂S and P₂S₅ at a ratio so that the method produces the sulfide solid electrolyte glass, in which Li₄P₂S₇ is not detected by ³¹P NMR measurement and a content of Li₂S as determined by XPS measurement is 3% by mol or less.

4. The method for producing a sulfide solid electrolyte glass according to claim 3, wherein the content of Li₂S as determined by XPS measurement is 1% by mol or less.

5. The method for producing a sulfide solid electrolyte glass according to claim 3, wherein the amorphization treatment is mechanical milling.