TY - JOUR
T1 - Does carbon coating really improves the electrochemical performance of electrospun SnO2 anodes?
AU - Aravindan, Vanchiappan
AU - Sundaramurthy, Jayaraman
AU - Elumalai, Naveen Kumar
AU - Kumar, Palaniswamy Suresh
AU - Ling, Wong Chui
AU - von Hagen, Robin
AU - Mathur, Sanjay
AU - Ramakrishna, Seeram
AU - Madhavi, Srinivasan
PY - 2014/3/1
Y1 - 2014/3/1
N2 - In this paper, we report the influence of carbon coating on the electrochemical performance of hollow structured SnO2 electrospun nanofibers. The electrospun nanofibers are subjected to plasma enhanced chemical vapour deposition for a conformal carbon coating of ∼6 nm thickness without destroying the one dimensional morphological features of the fiber mats. Li-storage properties are evaluated in half-cell configuration between two different potential windows i.e. 0.005-0.8 V and 0.005-2.5 V vs. Li. The potential regions tested corresponds to the alloying/de-alloying and alloying/de-alloying & conversion reactions for former and latter cases, respectively. Very high reversibility over 3.6 moles of Li is feasible for both bare and carbon coated SnO2, without an obvious difference between the electrochemical profiles noted during cycling. In contrary, huge differences in the electrochemical performances are observed for bare and carbon coated SnO2 when the test cell is cycled for conversion reaction. This result clearly shows the importance of carbon coating for conversion reaction compared to alloying/de-alloying reaction.
AB - In this paper, we report the influence of carbon coating on the electrochemical performance of hollow structured SnO2 electrospun nanofibers. The electrospun nanofibers are subjected to plasma enhanced chemical vapour deposition for a conformal carbon coating of ∼6 nm thickness without destroying the one dimensional morphological features of the fiber mats. Li-storage properties are evaluated in half-cell configuration between two different potential windows i.e. 0.005-0.8 V and 0.005-2.5 V vs. Li. The potential regions tested corresponds to the alloying/de-alloying and alloying/de-alloying & conversion reactions for former and latter cases, respectively. Very high reversibility over 3.6 moles of Li is feasible for both bare and carbon coated SnO2, without an obvious difference between the electrochemical profiles noted during cycling. In contrary, huge differences in the electrochemical performances are observed for bare and carbon coated SnO2 when the test cell is cycled for conversion reaction. This result clearly shows the importance of carbon coating for conversion reaction compared to alloying/de-alloying reaction.
UR - http://www.scopus.com/inward/record.url?scp=84892774424&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2013.12.141
DO - 10.1016/j.electacta.2013.12.141
M3 - Article
VL - 121
SP - 109
EP - 115
JO - Electrochimica Acta
JF - Electrochimica Acta
SN - 0013-4686
ER -