ALL SOLID-STATE BATTERY AND METHOD FOR PRODUCING SAME

• US 20150249265A1
• Filed: 04/29/2015
• Published: 09/03/2015
• Est. Priority Date: 11/07/2012
• Status: Abandoned Application

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Tagami (nee Fukushima), Mika, MATSUMURA, TADAAKI
• Application Number:
  US14/699,627
• Publication Number:
  US 20150249265A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C01D 15/02 Oxides; Hydroxides
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• CPC Class Codes: H01M 10/0562 Solid materials
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 2300/0068 inorganic
• CPC Class Codes: H01M 4/136 Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/1397 of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/5825 Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines
• CPC Class Codes: H01M 4/583 Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/62 Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An all-solid-state battery that includes a positive electrode layer, a negative electrode layer and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer. At least one electrode layer selected from the positive electrode layer and the negative electrode layer contains an electrode active material, a sulfide solid electrolyte and fibrous carbon. The fibrous carbon includes at least fibrous carbon components that extend in the direction of lamination of the positive electrode layer, the solid electrolyte layer and the negative electrode layer.

Claims

1. An all-solid-state battery comprising:

a positive electrode layer;

a negative electrode layer; and

a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer,

wherein at least one electrode layer selected from the positive electrode layer and the negative electrode layer comprises an electrode active material, a sulfide solid electrolyte and fibrous carbon, and

wherein the fibrous carbon comprises at least fibrous carbon components that extend in a direction of lamination of the positive electrode layer, the solid electrolyte layer and the negative electrode layer.

2. The all-solid-state battery according to claim 1, wherein 25% or more of the fibrous carbon components of the fibrous carbon contained in the electrode layer form angles of 50 to 90°

, both inclusive, with respect to a plane of lamination of the positive electrode layer, the solid electrolyte layer and the negative electrode layer.

3. The all-solid-state battery according to claim 1, wherein the fibrous carbon is fixed to the sulfide solid electrolyte.

4. The all-solid-state battery according to claim 3, wherein the fibrous carbon is located in interfaces between particles of the sulfide solid electrolyte.

5. The all-solid-state battery according to claim 1, wherein the fibrous carbon is located in interfaces between particles of the sulfide solid electrolyte.

6. The all-solid-state battery according to claim 1, wherein the electrode layer is the positive electrode layer.

7. The all-solid-state battery according to claim 6,

wherein the positive electrode layer contains a positive electrode active material,

the positive electrode active material comprises a lithium composite oxide having a polyanion structure represented by Li_aM_mXO_bF_c,

M is at least one transition metal;

X is at least one element selected from the group consisting of B, Al, Si, P, Cl, Ti, V, Cr, Mo and W;

0<

a≦

3,

0<

m≦

2,

2≦

b≦

4, and

0≦

c≦

1.

8. The all-solid-state battery according to claim 7, wherein the lithium composite oxide is a phosphate compound.

9. The all-solid-state battery according to claim 8, wherein the phosphate compound is lithium iron phosphate.

10. A method for producing the all-solid-state battery as recited in claim 1, the method comprising:

mixing the electrode active material, the sulfide solid electrolyte and the fibrous carbon together to produce a mixture; and

compression-molding the mixture to produce a molded article.

11. The method according to claim 10, further comprising heating the molded article.