Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 12, Pages 13706-13711Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.04.211
Keywords
ZnS nanoparticles; Carbon nanosheets; Hard template; Three-dimensional network; Anode material
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Funding
- National Natural Science Foundation of China [51502350, 51472272]
- China Postdoctoral Science Foundation [2016M592447]
- International Postdoctoral Exchange Fellowship Program [155212]
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ZnS nanoparticles coated with honeycomb-like carbon nanosheets (ZnS@HPC) were synthesized via freeze drying and carbonization methods, using NaCl crystals as hard template. The ZnS@HPC composite possessed a novel three-dimensional network structure and high specific surface area of 128.9 m(2) g(-1). In this composite, ZnS nanoparticles with small diameter of 20-40 nm were embedded in carbon nanosheet matrix. Moreover, nitrogen-doped carbon formed successfully during the carbonization process. The porous carbon matrix provided a conductive network and also worked as a buffer to confine ZnS nanoparticle expansion during lithiation and delithiation process. So, the electrochemical performance of ZnS@HPC composite electrode was much better than that of ZnS and ZnS/C electrodes. As a novel anode material, ZnS@HPC composite exhibited the initial cycle discharge and charge capacities of 1359 and 889 mAh g(-1) at 100 mA g(-1); and showed excellent cycle performance, the discharge capacity achieved 408 mAh g(-1) after cycling at 1 A g(-1) for 200 cycles.
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