Composition and method for lamination of silicon dominant electrodes

Patent metadata

Field	Value
Publication number	US-11618800-B2
Application number	US-202117553369-A
Country	US
Kind code	B2
Filing date	Dec 16, 2021
Priority date	Aug 22, 2019
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

Disclosed are maleic anhydride-grafted cyclic olefin copolymers, methods for preparing maleic anhydride-grafted cyclic olefin copolymers, low temperature methods for laminating anodes comprising the maleic anhydride-grafted cyclic olefin copolymers, and anodes and alkali ion batteries that comprise the maleic anhydride-grafted cyclic olefin copolymers.

First claim

The invention claimed is:

1. A solid film comprising an electrochemically active material and a polymer layer comprising a maleic anhydride-grafted cyclic olefin copolymer.

2. The solid film of claim 1 wherein the electrochemically active material is a silicon dominant material.

3. The solid film according to claim 1 , wherein the polymer layer has a final thickness of about 2 microns to about 5 microns.

4. The solid film according to claim 3 , wherein the polymer layer has a final thickness of about 3 microns.

5. The solid film according to claim 1 , wherein the cyclic olefin copolymer has a structure according to Formula I:

wherein A is a C 5 -C 12 carbocyclic ring, optionally substituted with one or more C1-6 alkyl, C2-6 alkenyl, or aryl groups; and
x and y are integers, wherein the ratio of x:y falls within a range of about 6:1 to about 1.5:1.

6. The solid film according to claim 5 , wherein A is selected from the group consisting of cyclopentyl, tetracyclododecenes, tetracyclododecenes, norbornanes (bicyclo[2.2.1]heptanes), and norbornenes (bicyclo[2.2.1]hept-2-enes).

7. The solid film according to claim 1 , wherein said maleic anhydride-grafted cyclic olefin copolymer is prepared by mixing a solution comprising a cyclic olefin copolymer with a solution of maleic anhydride to form a reaction mixture;
adding a radical initiator to the reaction mixture; and
maintaining the reaction mixture under conditions that allow for the formation of the maleic anhydride-grafted olefin copolymer.

8. The solid film according to claim 7 , wherein the radical initiator is selected from the group consisting of azo compounds and peroxides.

9. The solid film according to claim 8 , wherein the radical initiator is azobisisobutyronitrile (AIBN).

10. The solid film according to claim 7 , wherein the reaction mixture comprises a cyclohexane/toluene solvent system.

11. The solid film according to claim 7 , wherein the conditions that allow for the formation of the maleic anhydride-grafted olefin copolymer comprise heating the reaction mixture to a temperature range of 40° C. to 100° C.

12. The solid film according to claim 11 , wherein the conditions that allow for the formation of the maleic anhydride-grafted olefin copolymer comprise heating the reaction mixture to a temperature range of 50° C. to 60° C.

13. The solid film according to claim 12 , wherein the conditions that allow for the formation of the maleic anhydride-grafted olefin copolymer comprise heating the reaction mixture to a temperature range of about 55° C.

14. The solid film according to claim 7 , wherein the conditions that allow for the formation of the maleic anhydride-grafted olefin copolymer are maintained for about 8 hours to about 20 hours.

15. The solid film according to claim 14 , wherein the conditions that allow for the formation of the maleic anhydride-grafted olefin copolymer are maintained for about 16 hours.

16. The solid film according to claim 7 , wherein the conditions that allow for the formation of the maleic anhydride-grafted olefin copolymer comprise heating the reaction mixture to a temperature range of 50° C. to 60° C. for about 16 hours.

Assignees

• Enevate Corp

Inventors

• Nair Ambica
• Canton Giulia
• Browne Ian
• Buet Michael

Classifications

• C08F255/08

  on to polymers of olefins having four or more carbon atoms · CPC title

• H01M4/0471

  involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• C08F277/00 Primary

  Macromolecular compounds obtained by polymerising monomers on to polymers of carbocyclic or heterocyclic monomers as defined respectively in group C08F32/00 or in group C08F34/00 · CPC title

• H01M4/668

  Composites of electroconductive material and synthetic resins · CPC title