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Putting Nanoarmors on Yolk–Shell Si@C Nanoparticles: A Reliable Engineering Way To Build Better Si-Based Anodes for Li-Ion Batteries
journal contribution
posted on 2018-06-27, 00:00 authored by Jian Jiang, Han Zhang, Jianhui Zhu, Linpo Li, Yani Liu, Ting Meng, Lai Ma, Maowen Xu, Jinping Liu, Chang Ming LiPractical
utilization of silicon (Si) for Li-ion batteries (LIBs) still remains
sluggish because of its formidable kinetic problems of huge volume
expansions over 300%, instable solid electrolyte interphase (SEI),
and unsatisfactory electrical conductivity. Though using a yolk–shell
(Y–S) Si@C nanodesign indeed helps to mitigate active changes,
optimize SEI properties, and lower intrinsic charge-transfer impedances,
the total anodic behaviors in reversibility, rate capabilities, and
long-lasting cyclability are still far from perfect. To settle the
above issues, we herein propose a reliable and effective way by putting
tough and malleable Ni nanoarmors on Y–S Si@C nanoparticles
(Si@C⊆Ni). The unique functionalized configurations endow such
hybrid systems with superb reversible capacity retention (almost no
capacity decay emerges in 600 cycles, retaining a reversible capacity
beyond ∼1307 mA h g–1), prominent cyclic
stability, and rate behaviors. To justify their potential usage, full
cells of (−)Si@C⊆Ni//LiFePO4(+) are further
constructed, delivering impressive specific energy and power densities
(max. values: ∼423 W h kg–1/∼497.8
W kg–1). This paradigm work may offer a highly feasible
engineering protocol to push forward Si anode performances for next-generation
LIBs.
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cyclic stabilityvolume expansionscharge-transfer impedancesnext-generation LIBsengineering protocol600 cyclesfunctionalized configurationsrate behaviorsSEI propertieselectrolyte interphaseparadigm workpower densitiescapacity decayLi-Ion BatteriesNi nanoarmorsanodic behaviorsSi anode performancescapacity retentionReliable Engineering Wayrate capabilitiesBetter Si-Based AnodesLi-ion batteries
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