Slurry, production method for solid electrolyte layer, production method for electrode active material layer, and production method for all-solid-state battery

Patent metadata

Field	Value
Publication number	US-9236158-B2
Application number	US-201214005477-A
Country	US
Kind code	B2
Filing date	Mar 16, 2012
Priority date	Mar 18, 2011
Publication date	Jan 12, 2016
Grant date	Jan 12, 2016

Abstract

A main object of the present invention is to provide a practical slurry having a polar solvent as the dispersion medium for a sulfide solid electrolyte material. The present invention solves the above-mentioned problem by providing a slurry having: a sulfide solid electrolyte material, and a dispersion medium having at least one selected from the group consisting of tertiary amine; ether; thiol; ester having a functional group of a 3 or more carbon number bonded with a carbon atom of an ester bonding and a functional group of a 4 or more carbon number bonded with an oxygen atom of the ester bonding; and ester having a benzene ring bonded with a carbon atom of an ester bonding.

First claim

The invention claimed is:

1. A slurry comprising:
a sulfide solid electrolyte material; and
a dispersion medium comprising at least one selected from the group consisting of a tertiary amine; an ether; an ester having a functional group that contains 3 or more carbon atoms bonded with a carbon atom of the ester by a carbon-carbon bond and a functional group that contains 4 or more carbon atoms bonded with an oxygen atom of the ester; and an ester having a benzene ring bonded with a carbon atom of the ester by a carbon-carbon bond,
wherein:
the sulfide solid electrolyte material comprises a material composition including Li 2 S and P 2 S 5 ; and
the ether is at least one selected from the group consisting of cyclopentyl methyl ether, dibutyl ether, and anisole.

2. The slurry according to claim 1 , further comprising a non-polar solvent.

3. The slurry according to claim 1 , wherein a molar ratio of Li 2 S to P 2 S 5 in the material composition is in a range of from 70:30 to 80:20.

4. The slurry according to claim 1 , further comprising a binder.

5. The slurry according to claim 1 , wherein the dispersion medium comprises the tertiary amine.

6. The slurry according to claim 1 , wherein the dispersion medium comprises at least one selected from the group consisting of triethyl amine, tripropyl amine, and tributyl amine.

7. The slurry according to claim 1 , wherein:
the dispersion medium comprises the ester having a functional group that contains 3 or more carbon atoms bonded with a carbon atom of the ester by a carbon-carbon bond and a functional group that contains 4 or more carbon atoms bonded with an oxygen atom of the ester; and
the material composition further comprises LiI.

8. The slurry according to claim 1 , wherein the dispersion medium comprises butyl butyrate.

9. The slurry according to claim 1 , wherein:
the dispersion medium comprises the ester having a benzene ring bonded with a carbon atom of the ester by a carbon-carbon bond; and
the material composition further comprises LiI.

10. The slurry according to claim 1 , wherein the dispersion medium comprises ethyl benzoate.

11. The slurry according to claim 1 , wherein the dispersion medium comprises at least one selected from the group consisting of cyclopentyl methyl ether, dibutyl ether, and anisole.

12. A method for producing a solid electrolyte layer comprising:
mixing a sulfide solid electrolyte material and a dispersion medium to form a solid electrolyte layer forming slurry;
applying the solid electrolyte layer forming slurry on a substrate to form a solid electrolyte layer forming coating film; and
drying the solid electrolyte layer forming coating film to form a solid electrolyte layer,
wherein:
the sulfide solid electrolyte material comprises a material composition including Li 2 S and P 2 S 5 ;
the dispersion medium comprises at least one selected from the group consisting of a tertiary amine; an ether; an ester having a functional group that contains 3 or more carbon atoms bonded with a carbon atom of the ester by a carbon-carbon bond and a functional group that contains 4 or more carbon atoms bonded with an oxygen atom of the ester; and an ester having a benzene ring bonded with a carbon atom of the ester by a carbon-carbon bond; and
the ether is at least one selected from the group consisting of cyclopentyl methyl ether, dibutyl ether, and anisole.

13. The method according to claim 12 , wherein a non-polar solvent is also mixed with the sulfide solid electrolyte material and the dispersion medium to form the solid electrolyte layer forming slurry.

14. The method according to claim 12 , wherein a binder is also mixed with the sulfide solid electrolyte material and the dispersion medium to form the solid electrolyte layer forming slurry.

15. A method for producing an electrode active material layer comprising:
mixing an electrode active material, a sulfide solid electrolyte material, and a dispersion medium to form an electrode active material layer forming slurry;
applying the electrode active material layer forming slurry on a substrate to form an electrode active material layer forming coating film; and
drying the electrode active material layer forming coating film to form an electrode active material layer,
wherein:
the sulfide solid electrolyte material comprises a material composition including Li 2 S and P 2 S 5 ;
the dispersion medium comprises at least one selected from the group consisting of a tertiary amine; an ether; an ester having a functional group that contains 3 or more carbon atoms bonded with a carbon atom of the ester by a carbon-carbon bond and a functional group that contains 4 or more carbon atoms bonded with an oxygen atom of the ester; and an ester having a benzene ring bonded with a carbon atom of the ester; and
the ether is at least one selected from the group consisting of cyclopentyl methyl ether, dibutyl ether, and anisole.

16. The method according to claim 15 , wherein a non-polar solvent is also mixed with the electrode active material, sulfide solid electrolyte material, and dispersion medium to form the electrode active material layer forming slurry.

17. The method according to claim 15 , wherein a binder is also mixed with the electrode active material, sulfide solid electrolyte material, and dispersion medium to form the electrode active material layer forming slurry.

18. A method for producing an all-solid-state battery, the method comprising:
producing a solid electrolyte layer according to the method of claim 12 ;
wherein the all-solid-state battery comprises:
a cathode active material layer including a cathode active material,
an anode active material layer including an anode active material, and
the solid electrolyte layer formed between the cathode active material layer and the anode active material layer.

19. A method for producing an all-solid-state battery, the method comprising:
producing an electrode active material layer according to the method of claim 15 ;
wherein the all-solid-state battery comprises:
a cathode active material layer including a cathode active material,
an anode active material layer including an anode active material, and
the electrolyte layer formed between the cathode active material layer and the anode active material layer.

Assignees

• Kubo Hiroki
• Omori Keisuke
• Hashimoto Yuichi
• Toyota Motor Co Ltd

Inventors

• Kubo Hiroki
• Omori Keisuke
• Hashimoto Yuichi

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M10/052

  Li-accumulators · CPC title

• H01M4/621

  Binders · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M10/056

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title