Coated Cathode For Solid State Batteries

Patent metadata

Field	Value
Publication number	US-2021408539-A1
Application number	US-202117363693-A
Country	US
Kind code	A1
Filing date	Jun 30, 2021
Priority date	Jun 30, 2020
Publication date	Dec 30, 2021
Grant date	—

Abstract

A solid-state battery is described. The solid-state battery includes an anode, a coated cathode, and an electrolyte. The cathode coating is formed of lithium (Li), lanthanum (La), strontium (Sr), titanium (Ti), and oxygen (O). The cathode coating has a high ionic conductivity.

First claim

What is claimed is:

1 . A solid-state battery comprising:
a) an anode comprising lithium (Li) and indium (In); b) a coated cathode, wherein the cathode comprises lithium (Li), and wherein the cathode coating comprises lithium (Li), lanthanum (La), strontium (Sr), titanium (Ti), and oxygen (O); and c) an electrolyte comprising phosphorus (P) and sulfur (S).

2 . The solid-state battery of claim 1 , wherein the cathode coating comprises Li 0.35 La 0.5 Sr 0.05 TiO 3 .

3 . The solid-state battery of claim 1 , wherein the cathode coating has a thickness of about 15 nm to about 20 nm.

4 . The solid-state battery of claim 1 , wherein the cathode coating has an ionic conductivity of about 10 −4 S cm −1 to about 10 −5 S cm −1 at 30° C.

5 . The solid-state battery of claim 1 , wherein the cathode comprises LiCoO 2 .

6 . The solid-state battery of claim 1 , wherein the cathode further comprises nickel (Ni), manganese (Mn), cobalt (Co), and oxygen (O).

7 . The solid-state battery of claim 6 , wherein the cathode comprises LiNi 1/3 Mn 1/3 Co 1/3 O 2 (NMC 111).

8 . The solid-state battery of claim 6 , wherein the cathode comprises LiNi 0.5 Mn 0.1 Co 0.1 O 2 (NMC 811) or LiNi 0.5 Mn 0.3 Co 0.2 O 2 (NMC 532).

9 . The solid-state battery of claim 1 , wherein the electrolyte comprises Li 6 PS 5 Cl.

10 . The solid-state battery of claim 1 , wherein the battery has a capacity of at least 100 mAh g −1 .

11 . The solid-state battery of claim 1 , wherein the battery has an initial Coulombic efficiency of at least 70%.

12 . The solid-state battery of claim 1 , wherein the battery retains at least 90% of its original capacity after 850 cycles.

13 . The solid-state battery of claim 1 , wherein the battery has a capacity retention of at least 91% at C/3.

14 . The solid-state battery of claim 1 , wherein the battery has a voltage window from about 2.5 V versus Li—In to about 4.0 V versus Li—In.

15 . A coated cathode, wherein the cathode comprises lithium (Li), and wherein the cathode coating comprises lithium (Li), lanthanum (La), strontium (Sr), titanium (Ti), and oxygen (O).

16 . A method of making a coated cathode, the method comprising:
a) forming a sol by:
i) mixing lithium isopropoxide, lanthanum 2-methoxyethoxide, titanium isopropoxide, and strontium isopropoxide in an inert atmosphere;
ii) refluxing; and
iii) adding water;
b) mixing a dried powder comprising lithium, nickel, manganese, cobalt, and oxide with the sol to form a suspension; c) mixing the suspension; d) allowing a gel to form; and e) calcining and sintering the gel to form a coated cathode material.

17 . The method of claim 16 , wherein forming the sol comprises mixing lithium isopropoxide, lanthanum 2-methoxyethoxide, titanium isopropoxide, and strontium isopropoxide according to a stoichiometric ratio of Li 0.35 La 0.5 Sr 0.05 TiO 3 .

18 . The method of claim 16 , wherein forming the sol comprises mixing at least 10% mol excess lithium isopropoxide.

19 . The method of claim 16 , where forming the sol comprises adding at least 10 mol % water.

20 . The method of claim 16 , where the dried powder is mixed with the sol according to a ratio of 1 g NMC/0.25 mMol LLSTO.

Assignees

• Univ Northeastern
• Worcester Polytech Inst

Inventors

• Zhu Hongli
• Zhang Yubin
• Wang Yan
• Cao Daxian

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/131

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

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title