The ever-growing demand for wearable electronics drives the development of stretchable lithium-ion batteries(LIBs)with fast charging capability,in which stretchable polymer electrolytes(PEs)with high ionic conductivit...The ever-growing demand for wearable electronics drives the development of stretchable lithium-ion batteries(LIBs)with fast charging capability,in which stretchable polymer electrolytes(PEs)with high ionic conductivity and lithium-ion transference numbers(urn:x-wiley:1001604X:media:cjoc202200287:cjoc202200287-math-0001)are highly desirable.Herein,we report a highly stretchable and elastic PE with high ionic conductivity and urn:x-wiley:1001604X:media:cjoc202200287:cjoc202200287-math-0001,which is applicable in high-rate and stretchable LIBs.The PE was fabricated by incorporating polyethylene glycol(PEG)and lithium salts into polyurethane networks,whereinα-cyclodextrin(α-CD)acts as the cross-linker.The PEG chains are cross-linked by covalent and noncovalent bonds,and some PEG chains enter into the cavity ofα-CD to form PEG/α-CD inclusions.These structural features effectively suppress crystallization of the PEG chains,hinder movement of the counterions of Li+,and endow PE with satisfactory mechanical robustness.展开更多
基金X.L.thanks the National Key R&D Program of China(2018YFC1105401)for the financial support.
文摘The ever-growing demand for wearable electronics drives the development of stretchable lithium-ion batteries(LIBs)with fast charging capability,in which stretchable polymer electrolytes(PEs)with high ionic conductivity and lithium-ion transference numbers(urn:x-wiley:1001604X:media:cjoc202200287:cjoc202200287-math-0001)are highly desirable.Herein,we report a highly stretchable and elastic PE with high ionic conductivity and urn:x-wiley:1001604X:media:cjoc202200287:cjoc202200287-math-0001,which is applicable in high-rate and stretchable LIBs.The PE was fabricated by incorporating polyethylene glycol(PEG)and lithium salts into polyurethane networks,whereinα-cyclodextrin(α-CD)acts as the cross-linker.The PEG chains are cross-linked by covalent and noncovalent bonds,and some PEG chains enter into the cavity ofα-CD to form PEG/α-CD inclusions.These structural features effectively suppress crystallization of the PEG chains,hinder movement of the counterions of Li+,and endow PE with satisfactory mechanical robustness.
