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Rational Design of Hierarchical Nanotubes through Encapsulating CoSe2 Nanoparticles into MoSe2/C Composite Shells with Enhanced Lithium and Sodium Storage Performance
journal contribution
posted on 2018-05-25, 00:00 authored by Jingyu Gao, Yapeng Li, Liang Shi, Jingjing Li, Genqiang ZhangTransition-metal
diselenides have been extensively studied as desirable anode candidates
for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs)
because of their high theoretical capacities. However, it is of great
challenge to achieve satisfactory cycling performance, especially
for larger sodium ion storage, originated from electrode deterioration
upon large volume change. Herein, we reported the construction of
hierarchical tubular hybrid nanostructures through encapsulating CoSe2 nanoparticles into MoSe2/C composite shells via
a simple two-step strategy including a hydrothermal method followed
by vapor-phase selenization process. The unique tubular structure
enables the highly reversible Li/Na storage with high specific capacity,
enhanced cycling stability, and superior rate performance. It is indicated
that the contribution of partial pseudocapacitive behavior greatly
improves the rate capability for SIBs, where a high capacity retention
of 81.5% can be obtained when the current densities range from 0.1
to 3 A g–1 (460 mA h g–1 at 0.1
A g–1 vs 379 mA h g–1 at 3 A g–1). This work provides an effective design rationale
on transition-metal diselenide-based tubular nanostructures as superior
hosts for both Li and Na ions, which could push forward the development
of practical applications of transition-metal diselenide-based anodes
in LIBs and SIBs.
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LIBSIBEncapsulating CoSe 2 Nanoparticlesdesign rationaledensities rangesodium ion storagevolume changecycling performanceMoSeHierarchical Nanotubestransition-metal diselenide-based anodesrate capabilitypseudocapacitive behaviorsodium-ion batteriesEnhanced LithiumNa ionscapacity retentionmAhydrothermal methodrate performancecycling stabilityvapor-phase selenization processanode candidatesencapsulating CoSe 2 nanoparticlesRational Design0.1Sodium Storage Performance Transition-metal diselenideselectrode deteriorationlithium-ion batteriesnanostructuretransition-metal diselenide-based
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