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The aqueous sodium-ion battery (ASIB) is one of the promising new energy storage systems owing to the abundant resources of sodium as well as efficiency and safety of electrolyte. Herein, we report an ASIB system with Na 4 Mn 9 O 18 /carbon nanotube (NMO/CNT) as cathode, metal Zn as anode and a novel Na + /Zn 2+ mixed ion as electrolyte. The NMO/CNT with microspherical structure is prepared by a simple spray-drying method. The prepared battery delivers a high reversible specific capacity and stable cyclability. Furthermore, the battery displays a stable reversible discharge capacity of 53.2 mAh g -1 even at a high current rate of 4 C after 150 cycles. Our results confirm that the NMO/CNT composite is a promising electrode cathode material for ASIBs.

An aqueous sodium ion battery (ASIB) with metal Zn as anode and Na₄Mn₉O 18 -reduced graphene oxide (Na₄Mn₉O 18 -RGO) as cathode has been developed. In this work, spherical Na₄Mn₉O 18 -RGO composite particles were prepared via spray drying. The aqueous battery exhibits stable cyclability and high specific capacities. Typically, a high initial discharge capacity of 61.7 mAh·g -1 is attained at a high current rate of 4 C, and a stabilizing reversible capacity of 58.9 mAh·g -1 was obtained after 150 cycles. The network interlaced by RGO sheets provided fast electron conduction paths and structural stability to accommodate the mechanical stresses induced by sodium insertion and extraction, so the Na₄Mn₉O 18 -RGO electrode displayed superior electrochemical performance in the ASIB., Competing Interests: The authors declare no conflict of interest.