Journal
ELECTROCHIMICA ACTA
Volume 266, Issue -, Pages 254-262Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.02.010
Keywords
Lithium-ion batteries; Pores; N-doped; Carbon; Zeolitic imidazolate framework-8
Categories
Funding
- National Natural Science Foundation of China [51372278, U1507106, 21303270]
- Hunan Provincial Science and Technology Plan Project, China [2016TP1007, 2017TP1001]
- Innovation-Driven Project of Central South University [2016CXS031]
- National Key R&D Program of China [2017YFB0903502]
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We present a novel and facile strategy to prepare porous N-doped carbon coated MnO (MnO@NC-Z) nanospheres through solvent-free in-situ growth of ZIF-8 on ZnMn2O4 followed by carbonization. The obtained MnO@NC-Z nanospheres are composed of numerous MnO nanoparticles that are uniformly coated by an ultrathin (similar to 5 nm) and nitrogen-rich (similar to 3.7 wt%) carbon layer derived from the in-situ grown ZIF-8 layer, which could not only restrict the volume expansion of MnO during the charge-discharge process but also substantially improve the electrical conductivity. Meanwhile, the synthesized MnO@NC-Z also possesses a high porosity and large specific surface area due to the porous structure of the ZIF-8 precursor and the evaporation of nano-sized Zn reduced from the ZIF-8 during the carbonization process, which could facilitate the fast transport of Li ions. As the anode in lithium-ion batteries (LIBs), the prepared MnO@NC-Z nanospheres deliver excellent performance with a high reversible capacity of 1261 mA h g(-1) at 0.2 A g(-1), brilliant rate performance of 305 mA h g(-1) at a high rate of 5 Ag-1, and excellent cycling stability for 1000 cycles at 1 Ag-1 with a 96.5% capacity retention. Importantly, this solvent-free strategy of in-situ growth of ZIF-8 can also be extended to synthesize various metal oxides@carbon composites (e.g., FeOx@NC and CoOx@NC) for different applications such as energy storage and conversion. (C) 2018 Elsevier Ltd. All rights reserved.
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