Codoped Holey Graphene Aerogel by Selective Etching for High-Performance Sodium-Ion Storage

Jin Zhao, Yi-Zhou Zhang, Jianyu Chen, Wenli Zhang, Du Yuan, Rodney Chua, Husam N. Alshareef, Yanwen Ma

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

The pursuit of more efficient carbon-based anodes for sodium-ion batteries (SIBs) prepared from facile and economical methods is a very important endeavor. Based on the crystallinity difference within carbon materials, herein, a low-temperature selective burning method is developed for preparing oxygen and nitrogen codoped holey graphene aerogel as additive-free anode for SIBs. By selective burning of a mixture of graphene and low-crystallinity carbon at 450 °C in air, an elastic porous graphene monolith with abundant holes on graphene sheets and optimized crystallinity is obtained. These structural characteristics lead to an additive-free electrode with fast charge (ions and electrons) transfer and more abundant Na+ storage active sites. Moreover, the heteroatom oxygen/nitrogen doping favors large interlayer distance for rapid Na+ insertion/extraction and provides more active sites for high capacitive contribution. The optimized sample exhibits superior sodium-ion storage capability, i.e., high specific capacity (446 mAh g−1 at 0.1 A g−1), ultrahigh rate capability (189 mAh g−1 at 10 A g−1), and long cycle life (81.0% capacity retention after 2000 cycles at 5 A g−1). This facile and economic strategy might be extended to fabricating other superior carbon-based energy storage materials.
Original languageEnglish (US)
Pages (from-to)2000099
JournalAdvanced Energy Materials
DOIs
StatePublished - Mar 20 2020

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