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ABSTRACT Aqueous zinc‐ion batteries (AZIBs) have gained great attention due to their nontoxicity, low‐cost, and high theoretical capacity. However, the scarcity of suitable cathode materials with excellent performance limits the practical application of AZIBs. Herein, we develop a conducting polymer (polyaniline) and divalent ions (Ca 2+ ) co‐intercalated method to synergistically regulate the property of V 2 O 5 to enhance Zn 2+ storage performance. The synergistic effect of co‐insertion Ca 2+ and polyaniline (PANI) not only enlarges the interlayer spacing but also regulates multiple oxidation states of vanadium, which dramatically improves the conductivity, diffusion kinetics, and structural stability of host V 2 O 5 . Consequently, the resultant Ca/PANI/V 2 O 5 •nH 2 O (CPVO) as AZIBs cathodes exhibits extraordinary specific capacity of 512 mAh g –1 (0.5 A g –1 ) and cycling stability with an outstanding coulombic efficiency of around 100% after 2000 cycles (25 A g –1 ). Moreover, the Zn 2+ storage mechanism is elaborated by combining comprehensive characterizations and DFT calculations.
Yan et al. (Sat,) studied this question.