Composition and method for lamination of silicon dominant electrodes
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.
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.