4 years ago

Uniform Yolk–Shell MoS2@Carbon Microsphere Anodes for High-Performance Lithium-Ion Batteries

Uniform Yolk–Shell MoS2@Carbon Microsphere Anodes for High-Performance Lithium-Ion Batteries
Hongbin Lu, Yunmei Pan, Jiajia Zhang
As an electrode material for lithium-ion batteries (LIBs), MoS2 has attracted much attention because of its high capacity and low cost. However, the rational design of a novel electrode structure with a high capacity, fast charge/discharge rate, and long cycling lifetime remains a great challenge. Herein, a environmentally friendly etching strategy is reported for the construction of monodisperse, inner void-controlled yolk–shell MoS2@carbon microspheres. The resulting anode reveals an initial discharge capacity up to 1813 mAh g−1, a high reversible capacity (1016 mAh g−1), excellent cycling stability (200 cycles), and superior rate performance. Such microspheres consist of nanosized MoS2 yolks (≈280 nm), porous carbon shells (≈25 nm) and well-controlled internal voids in between, opening a new pathway for the optimization of the electrochemical properties of MoS2-based anodes without sacrificing their capacity. In addition, this etching strategy offers a new method for the development of functional, hollow MoS2-based composites. A good egg: Highly uniform yolk–shell MoS2@C microspheres were synthesized as lithium-ion battery (LIB) anodes, with the inner cavity between the carbon shell and MoS2 core easily tailored through a novel etching technique (see scheme). The rationally designed microsphere anode exhibits high reversible capacity, and excellent cycling stability and rate performance. The etching strategy developed may provide a new approach for the preparation of other carbon-based hollow nanostructures

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201701691

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