Journal
ACS NANO
Volume 13, Issue 2, Pages 2274-2280Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b08962
Keywords
hollow structured silicon; carbon nanotubes; solid-electrolyte interface confinement; high Coulombic efficiency; Li-ion battery
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Funding
- National Key Project on Basic Research [2015CB251104]
- China-US Electric Vehicle Project [S2016G9004]
- Natural Science Foundation of China [U1664256]
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A design of coaxial hollow nanocables of carbon nanotubes and silicon composite (CNTs@Silicon) was presented, and the lithiation/delithiation behavior was investigated. The FIB-SEM studies demonstrated hollow structured silicon tends to expand inward and shrink outward during lithiation/delithiation, which reveal the mechanism of inhibitive effect of the excessive growth of solid-electrolyte interface by hollow structured silicon. The as-prepared coaxial hollow nanocables demonstrate an impressive reversible specific capacity of 1150 mAh g(-1) over 500 cycles, giving an average Coulombic efficiency of >99.9%. The electrochemical impedance spectroscopy and differential scanning calorimetry confirmed the SEI film excessive growth is prevented.
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