Titanium disulfide (TiS) is investigated as an advanced conversion electrode for sodium (Na)-ion batteries (NIB) in an ether-based electrolyte (NaPF/glyme (DME)). The as-prepared TiS demonstrates a high reversible capacity of 1040 mA h g at 0.2 A g with the capacity contribution of 521 mA h g in the voltage region below 1.0 V (vs Na/Na), remarkable initial coulombic efficiency of 95.9% and superior rate capability of 621 mA h g at 40 A g. The high conductivity of the Ti-based compounds and nanosized particles generated by chemical conversion reactions could minimize the entropic barrier for the reversible conversion, resulting in high reversibility and ultrafast charge/discharge ability of the electrode. Moreover, with its strong ability to adsorb soluble polysulfide intermediates, the as-prepared TiS electrode exhibits superior cycling stability over 9000 cycles, serving as a stable and ultra-high capacity conversion electrode for NIBs.
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| http://dx.doi.org/10.1002/advs.201801021 | DOI Listing |
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