石墨烯
材料科学
涂层
阴极
电极
纳米技术
保形涂层
聚合
原位聚合
氧化物
化学工程
复合材料
化学
聚合物
工程类
物理化学
冶金
作者
Tianyuan Liu,Byeongyong Lee,Byoung Gak Kim,Michael J. Lee,Jinho Park,Seung Woo Lee
出处
期刊:Small
[Wiley]
日期:2018-07-31
卷期号:14 (34)
被引量:41
标识
DOI:10.1002/smll.201801236
摘要
Abstract Polydopamine, a functional coating material, is redox active as cathode materials for both Li‐ and Na‐ion batteries or hybrid capacitors. Here, a polydopamine coating onto 3D graphene framework is introduced through a simple hydrothermal process, during which graphene oxide serves not only as an oxidant for assisting the polymerization of dopamine, but also as a template for the conformal growth of polydopamine. High‐density films are fabricated by compressing the polydopamine‐coated graphene aerogels, which can be directly used as free‐standing and flexible cathodes in both Li‐ and Na‐cells. The compact electrodes deliver high capacities of ≈230 mAh g −1 in Li‐cells and ≈211 mAh g −1 in Na‐cells based on the total mass of electrodes. These compact electrodes also exhibit exceptional cycling stability and high rate performance due to the unique structure in which polydopamine is uniformly coated on the 3D structured graphene.
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