Journal
NANO ENERGY
Volume 73, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.104758
Keywords
MOF shell; Low-temperature melting synthesis; Carbon-confined nanostructure; In situ transmission electron microscopy; Lithium-ion battery
Categories
Funding
- National Natural Science Fund for Distinguished Young Scholars [51425204]
- National Natural Science Foundation of China [51302203, 21805219]
- National Key R&D Program of China [2016YFA0202603]
- Programme of Introducing Talents of Discipline to Universities [B17034]
- Yellow Crane Talent (Science & Technology) Program of Wuhan City
- Fundamental Research Funds for the Central Universities [WUT: 2019III012GX, 2017III009, 2017IVA100, 2017IVA096, 2017III040]
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology)
- State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology)
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Surface engineering has been applied to resolve the problem of cycling instability in conversion/alloying reaction electrodes which can have high capacity but suffer from large volumetric change and pulverization in electrochemical cycles. However, due to structural instability, most of the surface coatings are still fragile and unstable in electrochemical cycles. Here, a facile low-temperature melting method has been developed to fabricate a uniform and ultrathin metal-organic framework (MOF) shell on various oxides electrode materials, followed by a gradient heat treatment process. A uniform and ultrathin N-doped carbon (NC) shell is formed as a robust coating to keep the integrity of materials and provide a highly conductive pathway for both electron and ions. This carbon confinement strategy can be easily applied to diverse ternary metal oxides with high bonding energy, such as Zn2SiO4, Zn2WO4 and Zn2TiO4. The obtained carbon-confined Zn2SiO4 (Zn2SiO4@NC) nanowires have achieved enhanced lithium storage performances compared to pure Zn2SiO4 nanowires. As revealed by in situ transmission electron microscopy, in the process of lithiation the Zn2SiO4@NC nanowires have lower radical expansion and faster kinetics than pure Zn2SiO4 nanowires, and the N-doped carbon shell remains stable. This work provides a new approach for the design and construction of carbon-based nanostructures which have great potential in energy-related applications.
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