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. 2015 Oct 16;6:8622. doi: 10.1038/ncomms9622

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(a–d) The ex situ s.e.m. monitoring the cathodic morphological changes on increased cyclic numbers. EDX probing towards the S₈@CB@NNH cathode after 500 cycles: (e) a line-scan analysis and (f) EDX records on different particle zones. (g) High-resolution Ni 2p XPS spectrum and (h) a schematic showing working mechanisms of NNH in Li/S cathodes. Proper pathways for electron transfer in the discharge stage have also been displayed. Scale bars, 10 μm (a,b,d) and 100 nm (c).