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Improved electrochemical performance of SnO2-mesoporous carbon hybrid as a negative electrode for lithium ion battery applications

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Title Improved electrochemical performance of SnO2-mesoporous carbon hybrid as a negative electrode for lithium ion battery applications
 
Creator SRINIVASAN, NR
MITRA, S
BANDYOPADHYAYA, R
 
Subject MESOPOROUS CARBON
ANODE MATERIALS
SNO2 NANOPARTICLES
STORAGE PROPERTIES
LI
NANOTUBES
COMPOSITE
NANOCOMPOSITES
SILICA
IMPEDANCE
 
Description To utilize the high specific capacity of SnO2 as an anode material in lithium-ion batteries, one has to overcome its poor cycling performance and rate capability, which result from large volume expansion (similar to 300%) of SnO2 during charging-discharging cycles. Hence, to accommodate the volume change during cycling, SnO2 nanoparticles of 6 nm diameter were synthesized specifically only on the outer surface of the mesopores, present within mesoporous carbon (CMK-5) particles, resulting in an effective buffering layer. To that end, the synthesis process first involves the formation of 3.5 nm SnO2 nanoparticles inside the mesopores of mesoporous silica (SBA-15), the latter being used as a template subsequently to obtain SnO2-CMK-5 hybrid particles. SnO2-CMK-5 exhibits superior rate capabilities, e. g. after 30 cycles, a specific discharge capacity of 598 mA h g(-1), at a current density of 178 mA g(-1). Electrochemical impedance spectroscopy reveals that the SnO2-CMK-5 electrode undergoes a significant reduction in solid-electrolyte interfacial and charge transfer resistances, with a simultaneous increase in the diffusion coefficient of lithium ions, all these in comparison to an electrode made of only SnO2 nanoparticles. This enhances the potential of using the SnO2-CMK-5 hybrid as a negative electrode, in terms of improved discharge capacity and cycling stability, compared to other electrodes, such as only SnO2 or only CMK-5.
 
Publisher ROYAL SOC CHEMISTRY
 
Date 2014-12-28T12:00:31Z
2014-12-28T12:00:31Z
2014
 
Type Article
 
Identifier PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 16(14)6630-6640
1463-9076
1463-9084
http://dx.doi.org/10.1039/c3cp54492c
http://dspace.library.iitb.ac.in/jspui/handle/100/16423
 
Language English