Suppress oxygen evolution of lithium-rich manganese-based cathode materials via an integrated strategy

查看全文 作　　者：Wenhua [1]Yu;Yanyan [1]Wang;Aimin [1]Wu;Aikui [2]Li;Zhiwen [1]Qiu;Xufeng [1]Dong;Chuang [1]Dong;Hao [1]Huang

机构地区：[1]Key Laboratory of Energy Materials and Devices(Liaoning Province),School of Materials Science and Engineering,Dalian University of Technology,Dalian,116024,Liaoning Province,China;[2]Dalian Engineering Research Center for New Electric Power Systerms,School of Electrical Engineering,Dalian University of Technology,Dalian,116024,Liaoning Province,China

出　　处：《Green Energy & Environment》索引2024年第9卷第1期,共14页

基　　金：This work was supported by the Fundamental Research Funds for the Central Universities(DUT20LAB123 and DUT20LAB307);the Natural Science Foundation of Jiangsu Province(BK20191167). 摘　　要：Improving the reversibility of anionic redox and inhibiting irreversible oxygen evolution are the main challenges in the application of high reversible capacity Li-rich Mn-based cathode materials.A facile synchronous lithiation strategy combining the advantages of yttrium doping and LiYO_(2) surface coating is proposed.Yttrium doping effectively suppresses the oxygen evolution during the delithiation process by increasing the energy barrier of oxygen evolution reaction through strong Y–O bond energy.LiYO_(2) nanocoating has the function of structural constraint and protection,that protecting the lattice oxygen exposed to the surface,thus avoiding irreversible oxidation.As an Li^(+) conductor,LiYO_(2) nano-coating can provide a fast Li^(+) transfer channel,which enables the sample to have excellent rate performance.The synergistic effect of Y doping and nano-LiYO_(2) coating integration suppresses the oxygen release from the surface,accelerates the diffusion of Li^(+)from electrolyte to electrode and decreases the interfacial side reactions,enabling the lithium ion batteries to obtain good electrochemical performance.The lithium-ion full cell employing the Y-1 sample(cathode)and commercial graphite(anode)exhibit an excellent specific energy density of 442.9 Wh kg^(-1) at a current density of 0.1C,with very stable safety performance,which can be used in a wide temperature range(60 to-15℃)stable operation.This result illustrates a new integration strategy for advanced cathode materials to achieve high specific energy density. 关键词：Lithium-rich manganese-based cathodes Lithium ion batteries Oxygen redox Oxygen evolution Integrated strategy

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Suppress oxygen evolution of lithium-rich manganese-based cathode materials via an integrated strategy

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