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Spontaneous and reversible hollowing of alloy anode nanocrystals for stable battery cycling

Journal Article · · Nature Nanotechnology
High-capacity alloy anode materials for Li-ion batteries have long been held back by limited cyclability caused by the large volume changes during lithium insertion and removal. Hollow and yolk-shell nanostructures have been used to increase the cycling stability by providing an inner void space to accommodate volume changes and a mechanically and dimensionally stable outer surface. These materials, however, require complex synthesis procedures. Here, using in situ transmission electron microscopy, we show that sufficiently small antimony nanocrystals spontaneously form uniform voids on the removal of lithium, which are then reversibly filled and vacated during cycling. This behaviour is found to arise from a resilient native oxide layer that allows for an initial expansion during lithiation but mechanically prevents shrinkage as antimony forms voids during delithiation. In this work, we developed a chemomechanical model that explains these observations, and we demonstrate that this behaviour is size dependent. Thus, antimony naturally evolves to form optimal nanostructures for alloy anodes, as we show through electrochemical experiments in a half-cell configuration in which 15-nm antimony nanocrystals have a consistently higher Coulombic efficiency than larger nanoparticles.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
Sponsoring Organization:
Alfred P. Sloan Foundation; National Science Foundation (NSF); Swiss National Science Foundation (SNF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1775225
Journal Information:
Nature Nanotechnology, Journal Name: Nature Nanotechnology Journal Issue: 6 Vol. 15; ISSN 1748-3387
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Tailoring natural layered β-phase antimony into few layer antimonene for Li storage with high rate capabilities journal January 2019
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Sonochemistry-enabled uniform coupling of SnO 2 nanocrystals with graphene sheets as anode materials for lithium-ion batteries journal January 2019
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In-Situ Arc Discharge-Derived FeSn2/Onion-Like Carbon Nanocapsules as Improved Stannide-Based Electrocatalytic Anode Materials for Lithium-Ion Batteries journal November 2019
Sub-wavelength waveguide properties of 1D and surface-functionalized SnO 2 nanostructures of various morphologies journal January 2019
Inexpensive Antimony Nanocrystals and Their Composites with Red Phosphorus as High-Performance Anode Materials for Na-ion Batteries text January 2015
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