Charge storage mechanism of MOF-derived Mn2O3 as high performance cathode of aqueous zinc-ion batteries

• 来源期刊: 能源化学
• 年，卷（期）: 2021,（1）
• 页码范围: 277-283
• 页数: 7页
• 语种: 英文

摘要

Aqueous Zinc-ion batteries(ZIB)are attracting immense attention because of their merits of excellent safety and quite cheap properties compared with lithium-ion batteries(LIB).Manganese oxide is one of the most important cathode materials of ZIB.In this paper,α-Mn2O3 used as cathode of ZIB is synthe-sized via Metal-Organic Framework(MOF)-derived method,which delivers a high specific capacity of 225 mAh g-1 at 0.05 A g-1 and 92.7 mAh g-1 after 1700 cycles at 2 A g-1.The charge storage mechanism of α-Mn2O3 cathode is found to greatly depend on the discharge current density.At lower current density discharging,the H+and Zn2+are successively intercalated into the α-Mn2O3 before and after the"turning point"of discharge voltage and their discharging products present obviously different morphologies changing from flower-like to large plate-like products.At a higher current density,the low-voltage pla-teau after the turning point disappears due to the decrease of amount of Zn2+intercalation and the H+intercalation is dominated in α-Mn2O3.This study provides significant understanding for future design and research of high-performance Mn-based cathodes of ZIB.