Novel high-capacity electrode materials are required to increase the energy density of lithium-ion batteries. Metal polysulfides, MS x ( x > 2), are plausible candidates for such materials, whose high capacities are owed to multielectron processes. Hence, we mechanochemically synthesized novel amorphous niobium sulfides (NbS 3 , NbS 4 , and NbS 5 ) at room temperature. The cells fabricated using amorphous NbS 3 , NbS 4 , and NbS 5 showed high initial discharge capacities of 281, 446, and 596 mAh g −1 , corresponding to 2.0, 3.7, and 5.6 electron processes per formula unit, respectively. Remarkably, the cells using a carbonate-based electrolyte showed reversible high-capacity charging and discharging.
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Sakuda et al. (2014) studied this question.
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