Porous SnO2-CuO nanotubes for highly reversible lithium storage

Facile synthesis of rationally designed structures is critical to realize a high performance electrode for lithium-ion batteries (LIBs). Among different candidates, tin(IV) oxide (SnO2) is one of the most actively researched electrode materials due to its high theoretical capacity (1493 mAh g−1), ab...

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Bibliographic Details
Published in:Journal of power sources 2018-01, Vol.373, p.11-19
Main Authors: Cheong, Jun Young, Kim, Chanhoon, Jung, Ji-Won, Yoon, Ki Ro, Kim, Il-Doo
Format: Article
Language:English
Subjects:
Copper(II) oxide
Electrospinning
Lithium
Nanotube
Porous
Tin(IV) oxide
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Summary:Facile synthesis of rationally designed structures is critical to realize a high performance electrode for lithium-ion batteries (LIBs). Among different candidates, tin(IV) oxide (SnO2) is one of the most actively researched electrode materials due to its high theoretical capacity (1493 mAh g−1), abundance, inexpensive costs, and environmental friendliness. However, severe capacity decay from the volume expansion and low conductivity of SnO2 have hampered its use as a feasible electrode for LIBs. Rationally designed SnO2-based nanostructures with conductive materials can be an ideal solution to resolve such limitations. In this work, we have successfully fabricated porous SnO2-CuO composite nanotubes (SnO2-CuO p-NTs) by electrospinning and subsequent calcination step. The porous nanotubular structure is expected to mitigate the volume expansion of SnO2, while the as-formed Cu from CuO upon lithiation allows faster electron transport by improving the low conductivity of SnO2. With a synergistic effect of both Sn and Cu-based oxides, SnO2-CuO p-NTs deliver stable cycling performance (91.3% of capacity retention, ∼538 mAh g−1) even after 350 cycles at a current density of 500 mA g−1, along with enhanced rate capabilities compared with SnO2. [Display omitted] •Porous SnO2-CuO nanotubes (SnO2-CuO p-NTs) by electrospinning & calcination.•SnO2-CuO p-NTs exhibited superior ionic transport and penetration of electrolytes.•The structure of SnO2-CuO p-NTs was maintained without pulverization.•Introduction CuO into SnO2 results in more reversible reaction with Li.•SnO2-CuO p-NTs exhibited highly stable cycle retention up to 350 cycles.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2017.10.090