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Materials Congress 2018
Page 85
Nano Research & Applications
ISSN: 2471-9838
W o r l d C o n g r e s s o n
Materials Science & Engineering
A u g u s t 2 3 - 2 5 , 2 0 1 8
Am s t e r d a m , N e t h e r l a n d s
A
s an alternative to conventional graphite anodes, higher-capacity materials (e.g., Si, Ge, and Sn) with appropriately designed
nanostructures have been widely explored. However, problems associated with the unstable evolution of a solid-electrolyte
interphase (SEI) on the active anode surface still remain. Considering that the SEI develops on the active anode surface before
lithiation starts, most previous research focused on the novel hybrid design to prevent direct contact between electrolyte and
anode materials. However, since the Li ion/etchant-permeable shell cannot permanently prevent permeation of electrolyte,
these works gave rise to a dispute concerning the permeation of electrolyte and SEI development on the anode surface. In this
study, we propose a new approach that prevents the formation of an SEI layer by engineering the electric potential across the
electrolyte/anode interface. The silicide nanowire anodes anchored selectively to the inner surface of graphene-based micro-
tubules (NiSiNWs@GrµTs) were tested as a proof of concept for the proposed strategy and demonstrated unprecedentedly
excellent performance during 2000 cycles at 20C with a high specific capacity (over 700 mAh/g, corresponding to 84% of the
initial capacity). Moreover, the NiSiNWs@GrµT anodes showed superior rate capabilities with capacity retention higher than 88%
at 80C (vs. the capacity at 1C).
wipark@hanyang.ac.krSilicide nanowire anodes anchored selectively
to the inner surface of graphene-based micro-
tubular conducting electrodes for ultrafast
lithium-ion batteries
Won Jun Chang, Su Han Kim and Won Il Park
Hanyang University, Republic of Korea
Nano Res Appl 2018, Volume: 4
DOI: 10.21767/2471-9838-C4-018