Copper porphyrin within graphene hosts for high-performance lithium-ion battery cathodes  

作　　者：Wenjie Zhou Mingqiang Yang Yingzhi Chen Qihang Jing Qinglin Fang Yachao Yan Lu-Ning Wang 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Shunde Graduate School of University of Science and Technology Beijing,Foshan 528399,China

出　　处：《Journal of Materials Science & Technology》2024年第24期192-198,共7页材料科学技术(英文版)

基　　金：financially supported by the National Natural Science Foundation of China(No.52371248);the National Key R&D Program of China(No.2021YFB3802200);the Guangdong Basic and Applied Basic Research Foundation(No.2023A1515010905);the Scientific and Technological Innovation Foundation of Shunde Graduate School,USTB(No.BK22BE012).

摘　　要：Redox-active organic electrode materials have emerged as a promising alternative to inorganic counter-parts in view of their low cost and easily tunable chemical/electrical/mechanical properties.However,practical issues of using these materials remain as a consequence of their electrically insulating character,limited specific capacity and cyclability.Porphyrin,a highly conjugated macrocyclic organic compound,is an appealing candidate due to its multi-electron transfer mechanism and its small energy barrier for rapid electron transfer.Here,a new class of copper(Ⅱ)meso-tetra(4-pyridyl)porphyrin(CuTPyP)was ob-tained by introducing copper ions into free-base H_(2) TPyP for regulation of redox activity and prevention of material dissolution,and was further hosted on conducting reduced graphene oxide(rGO)to enhance the redox activity.The resultant CuTPyP/rGO composites hence demonstrated a high reversible discharge capacity of 152 mAh g^(-1) after 200 cycles,with a capacity retention rate of 84.5% at 0.5 C,vastly superior to the bare CuTPyP(113 mAh g^(-1))and free-base H2 TPyP(62 mAh g^(-1)).A deep insight into the chemical states showed that electron-donating N atoms in the tetrapyridyl subunits behaved as the main charge storage sites during the charge and discharge state along with part contribution from the Cu(Ⅱ)/Cu(Ⅰ)conversion center.The high and stable electrochemical performance makes porphyrins a potential choice for real-use cathodes for long-term organic alkali metal batteries.

关 键 词：PORPHYRIN GRAPHENE Lithium-ion battery Organic cathode 

分 类 号：TM912[电气工程—电力电子与电力传动]