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2015 ; 5
(ä): 13862
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Graphene-Wrapped Anatase TiO2 Nanofibers as High-Rate and Long-Cycle-Life Anode
Material for Sodium Ion Batteries
#MMPMID26355340
Yeo Y
; Jung JW
; Park K
; Kim ID
Sci Rep
2015[Sep]; 5
(ä): 13862
PMID26355340
show ga
Anatase TiO2 has been suggested as a potential sodium anode material, but the low
electrical conductivity of TiO2 often limits the rate capability, resulting in
poor electrochemical properties. To address this limitation, we propose
graphene-wrapped anatase TiO2 nanofibers (rGO@TiO2 NFs) through an effective
wrapping of reduced graphene oxide (rGO) sheets on electrospun TiO2 NFs. To
provide strong electrostatic interaction between the graphene oxide (GO) sheets
and the TiO2 NFs, poly(allylamine hydrochloride) (PAH) was used to induce a
positively charged TiO2 surface by the immobilization of the -NH3(+) group and to
promote bonding with the negatively charged carboxylic acid (-COO(-)) and
hydroxyl (-O(-)) groups on the GO. A sodium anode electrode using rGO@TiO2 NFs
exhibited a significantly improved initial capacity of 217 mAh g(-1), high
capacity retention (85% after 200 cycles at 0.2C), and a high average Coulombic
efficiency (99.7% from the second cycle to the 200th cycle), even at a 5C rate,
compared to those of pristine TiO2 NFs. The improved electrochemical performances
stem from highly conductive properties of the reduced GO which is effectively
anchored to the TiO2 NFs.