Phosphorous-based polyester electrolytes for high voltage lithium ion batteries

Patent metadata

Field	Value
Publication number	US-11101495-B2
Application number	US-201916275253-A
Country	US
Kind code	B2
Filing date	Feb 13, 2019
Priority date	Feb 13, 2019
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

New phosphorous-based polyesters have been synthesized. When these polymers are combined with electrolyte salts, such polymer electrolytes have shown excellent electrochemical oxidation stability in lithium battery cells. Their stability along with their excellent ionic transport properties make them especially suitable as electrolytes in high energy density lithium battery cells.

First claim

We claim:

1. A polymer electrolyte, comprising:
a crosslinked polymer structure described by:

wherein:
Y is selected from the group consisting of OZ and Z;
a and n are integers, wherein a ranges from 2 to 10, and n ranges from 1 to 1000;
Z is selected from the group consisting of:

wherein b is an integer that ranges from 1 to 10;
R 1 is selected from the group consisting of hydrogen, methyl, ethyl, propyl and isopropyl;
R is selected from the group consisting of:

wherein c, d and e are all integers that range independently from 0 to 10; and
X is selected from the group consisting of hydrogen, fluorine, methyl, ethyl, isopropyl, and trifluoromethyl; and
an electrolyte salt.

2. The polymer electrolyte of claim 1 further comprising ceramic electrolyte particles.

3. A positive electrode comprising:
a positive electrode active material; and
a catholyte comprising the polymer electrolyte according to claim 1 ;
wherein the positive electrode active material particles and the catholyte are mixed together.

4. The positive electrode of claim 3 wherein the catholyte further comprises a solid polymer electrolyte.

5. The positive electrode of claim 3 wherein the catholyte further comprises ceramic electrolyte particles.

6. The positive electrode of claim 3 wherein the positive electrode active material is selected from the group consisting of lithium metal phosphate, divanadium pentoxide, lithium nickel cobalt aluminum oxide, lithium nickel cobalt manganese oxide, magnesium-rich lithium nickel cobalt manganese oxide, lithium manganese spinel, lithium nickel manganese spinel, and combinations thereof.

7. The positive electrode of claim 3 wherein the electrolyte salt is a lithium salt.

8. An electrochemical cell, comprising:
an anode configured to absorb and release lithium ions;
a cathode comprising cathode active material particles, an electronically-conductive additive, and a first catholyte;
a current collector adjacent to an outside surface of the cathode; and
a separator region between the anode and the cathode, the separator region comprising a separator electrolyte configured to facilitate movement of lithium ions back and forth between the anode and the cathode;
wherein the first catholyte comprises the polymer electrolyte according to claim 1 , and the electrolyte salt is a lithium salt.

9. The electrochemical cell of claim 8 wherein the first catholyte further comprises a solid polymer electrolyte.

10. The electrochemical cell of claim 8 wherein the first catholyte and the separator electrolyte are the same.

11. The electrochemical cell of claim 8 wherein the separator electrolyte comprises a solid polymer electrolyte.

12. The electrochemical cell of claim 8 further comprising an overcoat layer between the cathode and the separator region, the overcoat layer comprising a second catholyte, the second catholyte comprising the polymer electrolyte according to claim 1 .

13. The electrochemical cell of claim 12 wherein the first catholyte and the second catholyte are the same.

14. The electrochemical cell of claim 8 wherein the first catholyte further comprises ceramic electrolyte particles.

15. A polymer electrolyte, comprising:
a crosslinked polymer structure described by:

wherein n ranges from 1 to 1000; and
an electrolyte salt.

16. The polymer electrolyte of claim 15 further comprising ceramic electrolyte particles.

Assignees

• Seeo Inc
• Bosch Gmbh Robert

Inventors

• Azagarsamy Malar
• Sivanandan Kulandaivelu
• Eitouni Hany Basam
• Mailoa Jonathan P
• Samsonidze Georgy
• Kozinsky Boris
• Kornbluth Mordechai

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M10/052 Primary

  Li-accumulators · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M2300/0082

  Organic polymers · CPC title