title: Covalently Functionalized Graphene by Radical Polymers for Graphene-Based High-Performance Cathode Materials.
abstract: Polymer-functionalized graphene sheets play an important role in graphene-containing composite materials. Herein, functionalized graphene sheets covalently linked with radical polymer, graphene-graft-poly(2,2,6,6-tetramethylpiperidin-1-oxyl-4-yl methacrylate) (G-g-PTMA), were prepared via surface-initiated atom transfer radical polymerization (SI-ATRP). A composite cathode with G-g-PTMA as major active material and reduced graphene oxide (RGO) as conductive additive was fabricated via a simple dispersing-depositing process, and this composite cathode exhibited a relatively high specific capacity up to 466 mAh g(-1) based on the mass of PTMA, which is much higher than the theoretical capacity of PTMA. This extraordinary electrochemical performance is attributed to the fast one-electron redox reaction of G-g-PTMA and surface Faradaic reaction of RGO boosted by G-g-PTMA, which suggested that G-g-PTMA sheets play a dual role in the composite materials, that is, on the one hand provided the fast one-electron redox reaction of PTMA and on the other hand worked as nanofiller for facilitating the surface Faradaic reaction-based lithium storage of RGO.
authors.affiliation: Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, People's Republic of China.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Li
authors.affiliation: Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, People's Republic of China.|Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, People's Republic of China.
authors.forename: Zukai
authors.initials: Z
authors.lastname: Jian
authors.affiliation: Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology , 130 Meilong Road, Shanghai 200237, People's Republic of China.
authors.forename: Meidong
authors.initials: M
authors.lastname: Lang
authors.affiliation: National Engineering Research Center for Nanotechnology , 28 East Jiangchuan Road, Shanghai 200241, People's Republic of China.
authors.forename: Chunming
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, People's Republic of China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Huang
keywords: cathode; composite material; covalent functionalization; graphene; radical polymer