Recently, research on Li and Zn based aqueous batteries have gained driving forces due to the high ionic conductivity, low-cost, safety, environmental benignity of aqueous electrolytes (vs. costly, flammable and hazardous organic electrolytes). Meanwhile, it is interesting that metal sulfides, such as amorphous MoS3, which has been intensively researched in organic electrolyte based Li-ion batteries, remains unexplored in aqueous electrolyte based batteries. In this work, we have studied MoS3 as electrode materials for “water-in-salt” electrolyte (WISE) based Li-ion batteries (LIBs). MoS3 achieved a high specific capacity of 127 mAh/g at the current density of 0.1 A/g and good stability over 1000 cycles. During operation, MoS3 underwent irreversible conversion to Li2MoO4 (with H2S and H2 evolution) during the initial Li ion uptake, and was then converted gradually to a more stable and reversible LixMoOy (2≤y≤4)) phase along cycling. Amorphous Li-deficient Lix-mMoOy/MoOz was formed upon delithiation. Nevertheless, MoS3 outperformed MoO3 in WISE-based LIBs. Meanwhile, the use of MoS3 as electrode material for aqueous Zn-ion batteries has been preliminarily explored, showing a promising electrochemical performance, while a detailed study is following.  These results demonstrate large promise for MoS3 to work as electrode materials in both aqueous Li- and Zn-ion batteries, and push forward the development of metal sulfides for aqueous energy storage applications.

MoS<sub>3</sub> for rechargeable aqueous Li and Zn batteries

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

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MoS3 for rechargeable aqueous Li and Zn batteries

MoS₃ for rechargeable aqueous Li and Zn batteries