MnO-pillared graphene blocks enabling the ultrastable and ultrafast aqueous zinc ion batteries  

作　　者：Zheng Liu Zhipeng Qiu Zhiyuan Li Tong Wei Zhuangjun Fan Huan Pang 

机构地区：[1]School of Chemistry and Chemical Engineering,Yangzhou University,Yangzhou 225002,China [2]School of Materials Science and Engineering,China University of Petroleum,Qingdao 266580,China

出　　处：《Science China Chemistry》2024年第9期2930-2940,共11页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(52202311,52272259);the Key Basic Research Projects of Natural Science Foundation of Shandong Province(ZR2019ZD51);the Taishan Scholar Project of Shandong Province(ts20190922)。

摘　　要：Due to the low cost,high theoretical capacity,and environmental friendliness,manganese-based cathodes are regarded as promising alternatives for aqueous zinc ion batteries(AZIBs).However,the practicality of the zinc-manganese system is faced with great challenges,such as the inevitable structural collapse of the cathode and controversial energy storage mechanisms.Herein,we propose a novel concept of spatial deposition mechanism through the addition of MnSO_(4) additives in the Mn O-pillared graphene blocks(G-MnO).The covalent interface between MnO nanoparticles and multilayered graphene nanosheets can construct an in-built micro-electric field,which is beneficial for consecutive electron transfer(in both horizontal and vertical directions).On this basis,the surficial activity of MnO confined in the interlayered nano-space is greatly enhanced and provides enough spatial deposition and subsequent reaction site for MnSO_(4) additives,thus firstly extending the surficial controlled process to stereoscopic space,effectively improving the electrochemical performance of AZIBs.Therefore,the assembled Zn//G-Mn O battery exhibits an excellent rate capability of 281.5 mAhg^(-1)at 0.1 A g^(-1)and 106 mAhg^(-1)at 20 Ag^(-1),and impressive cycling stability(93 mAhg^(-1)remaining after 5,000 cycles).This finding may provide a new opportunity for the rational design of surficial controlled energy storage and conversion devices.

关 键 词：zinc-ion battery manganese monoxide laminated constructure ultrahigh rate performance GRAPHENE 

分 类 号：TQ127.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]