Abstract

Chloride-ion batteries (CIBs) are considered potential alternatives to Lithium-ion batteries (LIBs). Here, we report a novel CIB composed of a molybdenum disulfide (MoS 2 ) cathode, a zinc (Zn) anode, and a “water-in-salt” electrolyte. Leveraging MoS 2 ’s exceptional chloride-ion storage capability, we achieved a high specific capacity of 258.1 mAh g −1 and retained 86.4% of the maximum discharge capacity after 1700 cycles. Additionally, the “water-in-salt” electrolyte provides a high discharge voltage platform of 2.2 V for aqueous CIBs. We investigated the principle and demonstrated reversible absorption/desorption of Cl − by the MoS 2 cathode.