All-solid state cell

1. An all-solid-state cell, comprising:

a lithium-containing anode;

a cathode; and

a lithium ion-conducting solid-state electrolyte separator situated between the anode and the cathode;

wherein:

the cathode includes a composite material, the composite material including lithium titanate and a lithium ion-conducting solid-state electrolyte; and

at least one of the following:

the lithium ion-conducting solid-state electrolyte includes a plurality of layers that differ from each other by being composed of different ones of at least two of (a) lithium sulfide-phosphorus sulfides, (b) lithium lanthanum zirconates, and (c) lithium niobates; and

the lithium titanate is based on the general chemical formula: Li 4+x−y−z Fe 3y Cu z Ti 5−2y−m (Nb,Ta) m O 12 , where each of x, z, and m is greater than 0.

2. The all-solid-state cell of claim 1 , wherein the lithium titanate includes Li 4+B and B>0.

3. The all-solid-state cell of claim 2 , wherein:

B=( x−y−z );

the at least one lithium titanate is based on the general chemical formula: Li 4+x−y−z Fe 3y Cu z Ti 5−2y−m (Nb,Ta) m O 12 ;

x≦3;

y≦1; and

m≦0.1.

4. The all-solid-state cell of claim 1 , wherein the composite material includes lithium titanate-containing particles, which are partially or completely coated with the lithium ion-conducting solid-state electrolyte.

5. The all-solid-state cell of claim 1 , wherein the solid-state electrolyte separator includes at least one lithium sulfide-phosphorus sulfide and at least one lithium lanthanum zirconate.

6. The all-solid-state cell of claim 1 , wherein the anode is formed from metallic lithium.

7. The all-solid-state cell of claim 1 , wherein the lithium ion-conducting solid-state electrolyte of the cathode includes lithium lanthanum zirconates.

8. The all-solid-state cell of claim 1 , wherein the lithium ion-conducting solid-state electrolyte of the cathode includes lithium niobates.

9. The all-solid state cell of claim 1 , wherein the lithium ion-conducting solid-state electrolyte includes the plurality of layers that differ from each other by being composed of different ones of at least two of (a) lithium sulfide-phosphorus sulfides, (b) lithium lanthanum zirconates, and (c) lithium niobates.

10. The all-solid state cell of claim 1 , wherein the lithium titanate is based on the general chemical formula: Li 4+x−y−z Fe 3y Cu z Ti 5−2y−m (Nb,Ta) m O 12 , where each of x, z, and m is greater than 0.

11. The all-solid state cell of claim 10 , wherein the lithium titanate includes Li 4+B , and B, which equals x−y−z, is greater than 0.

12. The all-solid state cell of claim 10 , wherein y is greater than 0.

13. The all solid state cell of claim 12 , wherein the lithium titanate includes Li 4+B , and B, which equals x−y−z, is greater than 0.

14. The all-solid-state cell of claim 13 , wherein:

x≦3;

y≦1; and

m≦0.1.

15. The all-solid-state cell of claim 10 , wherein:

x≦3;

y≦1;

m≦0.1.

16. The all-solid-state cell of claim 15 , wherein 0.2≦y≦1.

17. The all-solid-state cell of claim 15 , wherein z≦0.2.

18. An all-solid-state battery, comprising:

at least one all-solid-state cell that includes:

a lithium-containing anode;

a cathode; and

a lithium ion-conducting solid-state electrolyte separator situated between the anode and the cathode;

wherein:

the cathode includes a composite material, the composite material including lithium titanate and a lithium ion-conducting solid-state electrolyte; and

at least one of the following:

the at least one lithium ion-conducting solid-state electrolyte includes a plurality of layers that differ from each other by being composed of different ones of at least two of (a) lithium sulfide-phosphorus sulfides, (b) lithium lanthanum zirconates, and (c) lithium niobates; and

the lithium titanate is based on the general chemical formula: Li 4+x−y−z Fe 3y Cu z Ti 5−2y−m (Nb,Ta) m O 12 , where each of x, z, and m is greater than 0.

19. A system, comprising:

at least one of a mobile system, a stationary system, a vehicle, an energy storage system, a power tool, an electrical garden tool, and an electronic device; and

at least one all-solid-state cell that includes:

a lithium-containing anode;

a cathode; and

a lithium ion-conducting solid-state electrolyte separator situated between the anode and the cathode;

wherein:

the cathode includes a composite material, the composite material including lithium titanate and a lithium ion-conducting solid-state electrolyte; and

at least one of the following:

the at least one lithium ion-conducting solid-state electrolyte includes a plurality of layers that differ from each other by being composed of different ones of at least two of (a) lithium sulfide-phosphorus sulfides, (b) lithium lanthanum zirconates, and (c) lithium niobates; and

the lithium titanate is based on the general chemical formula: Li 4+x−y−z Fe 3y Cu z Ti 5−2y−m (Nb,Ta) m O 12 , where each of x, z, and m is greater than 0.

20. A method of producing an all-solid-state cell, comprising:

providing in combination a lithium-containing anode, a cathode, and a lithium ion-conducting solid-state electrolyte separator situated between the anode and the cathode;

wherein:

the cathode includes a composite material, the composite material including a lithium ion-conducting solid-state electrolyte and a lithium titanate;

the providing further comprises calcining the lithium titanate of the composite material in a reducing atmosphere; and

at least one of the following:

the lithium ion-conducting solid-state electrolyte includes a plurality of layers that differ from each other by being composed of different ones of at least two of (a) lithium sulfide-phosphorus sulfides, (b) lithium lanthanum zirconates, and (c) lithium niobates; and

the lithium titanate is based on the general chemical formula: Li 4+x−y−z Fe 3y Cu z Ti 5−2y−m (Nb,Ta) m O 12 , where each of x, z, and m is greater than 0.