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5931682 
Journal Article 
Suppressing Manganese Dissolution in Potassium Manganate with Rich Oxygen Defects Engaged High-Energy-Density and Durable Aqueous Zinc-Ion Battery 
Fang, G; Zhu, C; Chen, M; Zhou, J; Tang, B; Cao, X; Zheng, X; Pan, A; Liang, S 
2019 
Yes 
Advanced Functional Materials
ISSN: 1616-301X
EISSN: 1616-3028 
29 
15 
WOS:000467981000013 
The manganese dissolution leading to sharp capacity decline as well as the sluggish reaction kinetic are still major issues for manganese-based materials as aqueous zinc-ion batteries (ZIBs) cathodes. Here, a potassium-ion-stabilized and oxygen-defect K0.8Mn8O16 is reported as a high-energy-density and durable cathode for neutral aqueous ZIBs. A new insight into suppressing manganese dissolution via incorporation of K+ ions to intrinsically stabilize the Mn-based cathodes is provided. A comprehensive study suggests that oxygen defects improve electrical conductivity and open the MnO6 polyhedron walls for ion diffusion, which plays a critical role in the fast reaction kinetics and capacity improvement of K0.8Mn8O16. In addition, direct evidence for the mechanistic details of simultaneous insertion and conversion reaction based on H+-storage mechanism is demonstrated. As expected, a significant energy output of 398 W h kg(-1) (based on the mass of cathode) and an impressive durability over 1000 cycles with no obvious capacity fading are obtained. Such a high-energy Zn-K0.8Mn8O16 battery, as well as the basic understanding of manganese dissolution and oxygen defects may open new opportunities toward high-performance aqueous ZIBs. 
aqueous zinc-ion batteries; energy density; long cycle life; manganese dissolution; oxygen defects