Rechargeable energy storage system having separator coated with oxygen storage catalyst

Patent metadata

Field	Value
Publication number	US-2026045596-A1
Application number	US-202418795258-A
Country	US
Kind code	A1
Filing date	Aug 6, 2024
Priority date	Aug 6, 2024
Publication date	Feb 12, 2026
Grant date	—

Abstract

A method for forming a battery cell in a rechargeable energy storage system includes providing a cathode and an anode, the cathode incorporating a lithium metal phosphate. The method includes positioning a separator between the cathode and the anode, the separator having an anode-facing side and a cathode-facing side. The method includes applying a catalyst layer composed of an oxygen storage catalyst on the cathode-facing side of the separator such that the catalyst layer continuously coats the cathode-facing side of the separator. The oxygen storage catalyst has an oxygen-capturing ability at or above a threshold temperature, the oxygen storage catalyst has an oxygen-retention ability at or above the threshold temperature and the threshold temperature is at least 200 degrees Celsius.

First claim

What is claimed is:

1 . A method for forming a battery cell in a rechargeable energy storage system, the method comprising:
providing a cathode and an anode, the cathode incorporating a lithium metal phosphate; positioning a separator between the cathode and the anode, the separator having an anode-facing side and a cathode-facing side; and applying a catalyst layer composed of an oxygen storage catalyst on the cathode-facing side of the separator such that the catalyst layer continuously coats the cathode-facing side of the separator, wherein the oxygen storage catalyst has an oxygen-capturing ability at or above a threshold temperature, the oxygen storage catalyst has an oxygen-retention ability at or above the threshold temperature and the threshold temperature is at least 200 degrees Celsius.

2 . The method of claim 1 , further comprising:
selecting the threshold temperature to be 250 degrees Celsius.

3 . The method of claim 1 , further comprising:
configuring a thickness of the catalyst layer to be between 0.1 nanometers and 100 nanometers.

4 . The method of claim 1 , further comprising:
incorporating a configuration [LiFe x Mn 1-x PO 4 ] in the lithium metal phosphate of the cathode, where Li is lithium, Fe is iron, Mn is manganese, P is phosphorus and O is oxygen.

5 . The method of claim 1 , further comprising:
selecting the oxygen storage catalyst to include a perovskite structure [ABO3], wherein A and B are cations and O is oxygen.

6 . The method of claim 5 , further comprising:
selecting the oxygen storage catalyst to include ceric oxide [CeO2], wherein Ce is cerium and O is oxygen.

7 . The method of claim 1 , further comprising:
applying a binding layer between the cathode and catalyst layer, the binding layer being at least partially composed of polyvinylidene fluoride.

8 . The method of claim 7 , further comprising:
applying the catalyst layer on the cathode-facing side of the separator using atomic layer deposition, wherein the separator is at least partially composed of polyethylene.

9 . The method of claim 7 , further comprising:
applying the catalyst layer on the cathode-facing side of the separator using chemical vapor deposition, wherein the separator is at least partially composed of polyethylene.

10 . A rechargeable energy storage system comprising:
one or more battery cells respectively having an anode and a cathode, the cathode incorporating a lithium metal phosphate; a separator positioned between the anode and the cathode, the separator having an anode-facing side and a cathode-facing side; a catalyst layer continuously coating the cathode-facing side of the separator, the catalyst layer being composed of an oxygen storage catalyst; wherein the oxygen storage catalyst has an oxygen-capturing ability at or above a threshold temperature, the threshold temperature being at least 200 degrees Celsius; and wherein the oxygen storage catalyst has an oxygen-retention ability at or above the threshold temperature.

11 . The rechargeable energy storage system of claim 10 , further comprising:
a binding layer continuously coating the catalyst layer, the binding layer being between the cathode and the catalyst layer, the binding layer being at least partially composed of polyvinylidene fluoride; and wherein the catalyst layer has a thickness between 0.1 nanometers and 100 nanometers.

12 . The rechargeable energy storage system of claim 10 , wherein the lithium metal phosphate of the cathode has a configuration [LiFe x Mn 1-x PO 4 ], where Li is lithium, Fe is iron, Mn is manganese, P is phosphorus and O is oxygen.

13 . The rechargeable energy storage system of claim 12 , wherein the catalyst layer incorporates a perovskite structure [ABO3] in the catalyst layer, where A and B are cations and O is oxygen.

14 . The rechargeable energy storage system of claim 12 , wherein the catalyst layer incorporates ceric oxide [CeO2], where Ce is cerium and O is oxygen.

15 . A vehicle comprising:
a rechargeable energy storage system with one or more battery cells respectively having an anode and a cathode, the cathode incorporating a lithium metal phosphate; a separator positioned between the anode and the cathode, the separator having an anode-facing side and a cathode-facing side; a catalyst layer continuously coating the cathode-facing side of the separator, the catalyst layer being composed of an oxygen storage catalyst, the catalyst layer having a thickness between 0.1 nanometers and 100 nanometers; a binding layer continuously coating the catalyst layer, the binding layer being between the cathode and the catalyst layer; wherein the oxygen storage catalyst has an oxygen-capturing ability at or above a threshold temperature, and the threshold temperature is 250 degrees Celsius; and wherein the oxygen storage catalyst has an oxygen-retention ability at or above the threshold temperature.

16 . The vehicle of claim 15 , wherein the binding layer is at least partially composed of polyvinylidene fluoride.

17 . The vehicle of claim 16 , wherein the separator is at least partially composed of polyethylene.

18 . The vehicle of claim 15 , wherein the lithium metal phosphate of the cathode has a configuration [LiFe x Mn 1-x PO 4 ], where Li is lithium, Fe is iron, Mn is manganese, P is phosphorus and O is oxygen.

19 . The vehicle of claim 18 , wherein the catalyst layer incorporates a perovskite structure [ABO3] in the catalyst layer, where A and B are cations and O is oxygen.

20 . The vehicle of claim 18 , wherein the catalyst layer incorporates ceric oxide [CeO2], where Ce is cerium and O is oxygen.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Tu Mingjie
• Yadav Vamakshi
• Gao Jian
• Hafiz Hasnain

Classifications

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M50/451

  comprising layers of only organic material and layers containing inorganic material · CPC title

• H01M50/489

  Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties · CPC title

• H01M50/449

  having a layered structure · CPC title

• H01M10/523

  by recombination on a catalytic material · CPC title