Open AccessReduced graphene oxide as a stable and high-capacity cathode material for Na-ion batteries
Author(s) -
Ghulam Ali,
Asad Mehmood,
Heung Yong Ha,
Jaehoon Kim,
Kyung Yoon Chung
Publication year - 2017
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep40910
Subject(s) - graphene , cathode , materials science , oxide , electrode , carbon fibers , current density , chemical engineering , ion , nanotechnology , composite material , chemistry , composite number , metallurgy , physics , quantum mechanics , engineering , organic chemistry
We report the feasibility of using reduced graphene oxide (RGO) as a cost-effective and high performance cathode material for sodium-ion batteries (SIBs). Graphene oxide is synthesized by a modified Hummers’ method and reduced using a solid-state microwave irradiation method. The RGO electrode delivers an exceptionally stable discharge capacity of 240 mAh g −1 with a stable long cycling up to 1000 cycles. A discharge capacity of 134 mAh g −1 is obtained at a high current density of 600 mA g −1 , and the electrode recovers a capacity of 230 mAh g −1 when the current density is reset to 15 mA g −1 after deep cycling, thus demonstrating the excellent stability of the electrode with sodium de/intercalation. The successful use of the RGO electrode demonstrated in this study is expected to facilitate the emergence of low-cost and sustainable carbon-based materials for SIB cathode applications.