Interface protection for all-solid-state batteries

Patent metadata

Field	Value
Publication number	US-2023113915-A1
Application number	US-202117913110-A
Country	US
Kind code	A1
Filing date	Mar 19, 2021
Priority date	Mar 20, 2020
Publication date	Apr 13, 2023
Grant date	—

Abstract

An interfacial protective coating layer of LTO is effective in preventing unwanted interfacial reactions between the solid-state electrolyte and cathode electrodes from occurring. Incorporation of the inventive coating into sodium-based all-solid-state batteries allows for room temperature operation, high voltage, and long cycle life.

First claim

1 . A method for improving cycling stability of a sodium all-solid-state battery, comprising:
applying a LTO coating to a cathode of the battery.

2 . The method of claim 1 , wherein the cathode is NLNMO.

3 . The method of claim 1 , wherein the cathode is Na 0.8 [Li 0.12 Ni 0.22 Mn 0.66 ]O 2 .

4 . The method of claim 1 , wherein the LTO coating is applied to particles of cathode material prior to formation of the cathode.

5 . The method of claim 1 , wherein the LTO coating is Li 4 Ti 5 O 12 .

6 . A coating for improving cycling stability of a sodium all-solid state battery, the coating comprising LTO applied to a cathode of the battery.

7 . The coating of claim 6 , wherein the cathode is NLNMO.

8 . The coating of claim 6 , wherein the cathode is Na 0.8 [Li 0.12 Ni 0.22 Mn 0.66 ]O 2 .

9 . The coating of claim 6 , wherein the LTO coating is applied to particles of cathode material and thermally processed prior to formation of the cathode.

10 . A sodium all-solid-state battery comprising:
a Na—Sn negative electrode; a NLNMO positive electrode having a LTO coating incorporated therein; and a NPS solid state electrolyte disposed between the positive electrode and the negative electrode.

11 . The battery of claim 10 , further comprising a carbon conductive additive disposed between the NPS solid electrolyte and the NLNMO positive electrode.

12 . The battery of claim 10 , wherein the cathode is Na 0.8 [Li 0.12 Ni 0.22 Mn 0.66 ]O 2 .

13 . The battery of claim 10 , wherein the LTO coating is applied to particles of positive electrode material and thermally processed prior to formation of the positive electrode.

14 . The battery of claim 10 , wherein the LTO coating is Li 4 Ti 5 O 12 .

15 . The battery of claim 10 , wherein the NPS solid electrolyte is Na 3 PS 4 .

16 . A method for fabricating a sodium all-solid state battery, the method comprising:
disposing within a mold, a composition comprising layers of:
an electrode powder comprising a metallic sodium alloy;
a cathode powder comprising particles having a LTO coating thereon;
a solid electrolyte powder; and
a carbon conductive additive; and
compressing the layers to form a cell.

17 . The method of claim 16 , wherein the composition comprises 10 weight ratio of cathode powder, 16 weight ratio of electrolyte powder, 1 weight ratio of carbon conductive additive, and an excess of electrode powder.

18 . The method of claim 16 , wherein the metallic sodium alloy comprises Na—Sn.

19 . The method of claim 16 , wherein the cathode powder is Na 0.8 [Li 0.12 Ni 0.22 Mn 0.66 ]O 2 .

20 . The method of claim 16 , wherein the LTO coating is Li 4 Ti 5 O 12 .

21 . The method of claim 16 , wherein the solid electrolyte is Na 3 PS 4 .

Assignees

• Univ California

Inventors

• Meng Ying Shirley
• Banerjee Abhik
• Tang Hanmei
• Wu Erik
• Nguyen Han
• Tan Darren Huan Shen
• Doux Jean-Marie
• Ong Shyue Ping

Classifications

• H01G11/50

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01M4/628 Primary

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/56

  Solid electrolytes, e.g. gels; Additives therein · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title