期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 27, 页码 17352-17359出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b05271
关键词
graphene; covalent functionalization; radical polymer; composite material; cathode
资金
- National Basic Research Program of China [2015CB931900]
- National Natural Science Foundation of China [21204098]
- Shanghai Scientific and Technological Innovation Project [14JC1493400]
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-oxy1-4-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.
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