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

作　　者：Min Mao Xingxing Wu Yi Hu Qunhui Yuan Yan-Bing He Feiyu Kang 

机构地区：[1]Tsinghua Shenzhen International Graduate School,Division of Energy&Environment,Tsinghua University,Shenzhen 518055,Guangdong,China [2]Laboratory of Advanced Materials,Department of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [3]State Key Laboratory of Advanced Welding and Joining,and School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,Guangdong,China

出　　处：《Journal of Energy Chemistry》2021年第1期277-283,I0009,共8页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (51672156);Local Innovative Research Teams Project of Guangdong Pearl River Talents Program (No. 2017BT01N111);Guangdong Province Technical Plan Project (2017B010119001);Shenzhen Technical Plan Project (JCYJ20170817161221958 and JCYJ20170412170706047);Shenzhen Graphene Manufacturing Innovation Center (201901161513)。

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 synthesized via Metal-Organic Framework(MOF)-derived method,which delivers a high specific capacity of225 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 plateau after the turning point disappears due to the decrease of amount of Zn2+ intercalation and the H+intercalation is dominated in α-Mn2 O3.This study provides significant understanding for future design and research of high-performance Mn-based cathodes of ZIB.

关 键 词：Zinc ion batteries α-Mn2O3 Metal-organic framework(MOF) Charge storage mechanism 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ137.12[化学工程—无机化工]