首页|Copper porphyrin within graphene hosts for high-performance lithium-ion battery cathodes
Copper porphyrin within graphene hosts for high-performance lithium-ion battery cathodes
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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 H2TPyP 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 H2TPyP(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.
Wenjie Zhou、Mingqiang Yang、Yingzhi Chen、Qihang Jing、Qinglin Fang、Yachao Yan、Lu-Ning Wang
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School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China
Shunde Graduate School of University of Science and Technology Beijing,Foshan 528399,China
School of Materials Science and Engineering,University of Science and Technology Beijing Beijing 100083,China
National Natural Science Foundation of ChinaNational Key R&D Program of ChinaGuangdong Basic and Applied Basic Research FoundationScientific and Technological Innovation Foundation of Shunde Graduate School,USTB
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