Substrate for solid-state battery

Patent metadata

Field	Value
Publication number	US-9318774-B2
Application number	US-201313930109-A
Country	US
Kind code	B2
Filing date	Jun 28, 2013
Priority date	Jun 28, 2013
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

Disclosed are solid-state batteries having improved energy density and methods of manufacturing the solid-state batteries having improved energy density. In some embodiments, the solid-state battery may include a substrate of yttria-stabilized zirconia, a cathode current collector formed on the substrate, an anode current collector formed on the substrate, a cathode of lithium cobalt oxide in electrical contact with the cathode current collector, an anode of lithium in electrical contact with the anode current collector, and a solid-state electrolyte of lithium phosphorous oxynitride formed between the cathode and the anode.

First claim

We claim:

1. A solid-state battery comprising:
a substrate consisting of yttria-stabilized zirconia (YSZ);
a cathode current collector formed on the substrate;
an anode current collector formed on the substrate;
a cathode comprising lithium cobalt oxide in electrical contact with the cathode current collector;
an anode comprising lithium in electrical contact with the anode current collector; and
a solid-state electrolyte comprising lithium phosphorous oxynitride formed between the cathode and the anode.

2. The solid-state battery of claim 1 , wherein the substrate has a thickness between about 25 μm and about 40 μm.

3. The solid-state battery of claim 1 , wherein the cathode has a thickness between about 10 μm and about 15 μm.

4. The solid-state battery of claim 1 , further comprising a protective coating substantially covering the anode.

5. The solid-state battery of claim 4 , wherein the protective coating comprises at least one of silicon dioxide, alumina, or a ceramic.

6. The solid-state battery of claim 1 , wherein at least one of the anode current collector or the cathode current collector comprises stainless steel or nickel.

7. A solid-state battery comprising:
a substrate comprising a layer of yttria-stabilized zirconia (YSZ);
a first cathode current collector formed in contact with a first side of the layer of YSZ;
a first anode current collector formed in contact with the first side of the layer of YSZ;
a first cathode comprising lithium cobalt oxide (LiCoO2) in electrical contact with the first cathode current collector;
a first anode comprising lithium in electrical contact with the first anode current collector;
a first solid-state electrolyte comprising lithium phosphorous oxynitride (LiPON) formed between the first cathode and the first anode;
a second cathode current collector formed in contact with a second side of the layer of YSZ opposite the first side;
a second anode current collector formed in contact with the second side of the layer of YSZ;
a second cathode comprising LiCoO2 in electrical contact with the second cathode current collector;
a second anode comprising lithium in electrical contact with the second anode current collector; and
a second solid-state electrolyte comprising LiPON formed between the second cathode and the second anode.

8. The solid-state battery of claim 7 , wherein the substrate has a thickness between about 25 μm and about 40 μm.

9. The solid-state battery of claim 7 , wherein at least one of the first cathode and the second cathode has a thickness between about 10 μm and about 15 μm.

10. The solid-state battery of claim 7 , further comprising at least one of a first protective coating substantially covering the first anode or a second protective coating substantially covering the second anode.

11. The solid-state battery of claim 10 , wherein at least one of the first protective coating or the second protective coating comprises at least one of silicon dioxide, alumina, or a ceramic.

12. The solid-state battery of claim 7 , wherein at least one of the first anode current collector, the first cathode current collector, the second anode current collector, or the second cathode current collector comprises stainless steel or nickel.

13. A method comprising:
forming, on a substrate consisting of yttria-stabilized zirconia, an anode current collector and a cathode current collector;
forming a cathode comprising lithium cobalt oxide, wherein the cathode is in electrical contact with the cathode current collector;
annealing the cathode at a temperature between about 700° C. and about 800° C.;
forming a solid-state electrolyte comprising lithium phosphorous oxynitride; and
forming an anode comprising lithium, wherein the anode is in electrical contact with the anode current collector, and wherein the solid-state electrolyte is formed between the anode and the cathode.

14. The method of claim 13 , further comprising forming a protective coating substantially covering the anode.

15. The method of claim 14 , wherein the protective coating comprises at least one of silicon dioxide, alumina, or a ceramic.

16. The method of claim 13 , wherein at least one of the anode current collector or the cathode current collector comprises stainless steel or nickel.

17. A method for processing a roll comprising a plurality of substrates, wherein each substrate of the plurality consists of yttria-stabilized zirconia, the method comprising:
for each substrate of the plurality of substrates:
forming on the substrate an anode current collector and a cathode current collector,
forming a cathode comprising lithium cobalt oxide, wherein the cathode is in electrical contact with the cathode current collector,
annealing the cathode at a temperature between about 700° C. and about 800° C.,
forming a solid-state electrolyte comprising lithium phosphorous oxynitride, and
depositing an anode comprising lithium, wherein the anode is in electrical contact with the anode current collector, and wherein the solid-state electrolyte is formed between the anode and the cathode; and

separating each of the substrates of the plurality of substrates, thereby forming a plurality of solid-state batteries.

18. The method of claim 17 , further comprising, for each substrate of the plurality of substrates, forming a protective coating substantially covering the respective anode.

Assignees

• Google Inc

Inventors

• Bhardwaj Ramesh C
• Prakash Simon

Classifications

• H01M4/382

  Lithium (H01M4/405 takes precedence) · CPC title

• H01M10/0585

  of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators · CPC title

• H01M10/0436

  Small-sized flat cells or batteries for portable equipment · CPC title

• H01M6/40

  Printed batteries {, e.g. thin film batteries} · CPC title

• H01M10/052

  Li-accumulators · CPC title