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GeO x /Reduced Graphene Oxide Composite as an Anode for Li‐Ion Batteries: Enhanced Capacity via Reversible Utilization of Li 2 O along with Improved Rate Performance
Author(s) -
Lv Dongping,
Gordin Mikhail L.,
Yi Ran,
Xu Terrence,
Song Jiangxuan,
Jiang YingBing,
Choi Daiwon,
Wang Donghai
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201301882
Subject(s) - graphene , materials science , oxide , anode , composite number , cathode , chemical engineering , transmission electron microscopy , current density , electrochemistry , nanoparticle , nanotechnology , composite material , electrode , metallurgy , chemistry , physics , quantum mechanics , engineering
A self‐assembled GeO x /reduced graphene oxide (GeO x /RGO) composite, where GeO x nanoparticles are grown directly on reduced graphene oxide sheets, is synthesized via a facile one‐step reduction approach and studied by X‐ray diffraction, transmission electron microscopy, energy dispersive X‐ray spectroscopy, electron energy loss spectroscopy elemental mapping, and other techniques. Electrochemical evaluation indicates that incorporation of reduced graphene oxide enhances both the rate capability and reversible capacity of GeO x , with the latter being due to the RGO enabling reversible utilization of Li 2 O. The composite delivers a high reversible capacity of 1600 mAh g −1 at a current density of 100 mA g −1 , and still maintains a capacity of 410 mAh g −1 at a high current density of 20 A g −1 . Owing to the flexible reduced graphene oxide sheets enwrapping the GeO x particles, the cycling stability of the composite is also improved significantly. To further demonstrate its feasibility in practical applications, the synthesized GeO x /RGO composite anode is successfully paired with a high voltage LiNi 0.5 Mn 1.5 O 4 cathode to form a full cell, which shows good cycling and rate performance.