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Stabilization of Lattice Oxygen in Li-Rich Mn-Based Oxides via Swing-like Non-Isothermal Sintering

机译:Stabilization of Lattice Oxygen in Li-Rich Mn-Based Oxides via Swing-like Non-Isothermal Sintering

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摘要

Redox from the holes at the O_(2p) orbitals is a well-known phenomenon inLi-rich Mn-based batteries. However, such an anionic redox process resultsin the formation of O_2, leading to structural instability owing to unstable O_(2p)holes. Herein, a swing-like non-isothermal sintering technique is used to stabilizethe lattice oxygen by suppressing the formation of O_2 during charging.It reduces both the number of intrinsic oxygen vacancies of the Li-rich Mn-basedoxides and the formation of O_2 during charging as compared with traditionalconstant high-temperature sintering. Consequently, the number of holesgenerated during charging in the O_(2p) orbitals increases, whereas the numberof unstable O_(2p) holes forming O_2 decreases. Therefore, the sample preparedvia swing-like non-isothermal sintering exhibited considerably slower voltagefading and better cycling stability. This study provides valuable guidelinesfor stabilizing the lattice oxygen and improving the structural stability of theoxide cathodes for electrochemical energy storage.

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  • 来源
    《Advanced energy materials》 |2022年第43期|2202341.1-2202341.10|共10页
  • 作者单位

    Key Laboratory for Renewable EnergyChinese Academy of SciencesBeijing Key Laboratory for New Energy Materials and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190, P. R. China, College of Materials Science and Opto-Electronic Technolog;

    National Synchrotron Radiation Research CenterHsinchu, Taiwan 30076, Republic of China;

    Qingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101, P. R. ChinaMax Planck Institute for Chemical Physics of Solids01187 Dresden, GermanyState Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049, P. R. ChinaQingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101, P. R. China, School of Future TechnologyUniversity of Chinese Academy of SciencesBeijing 100049, P. R. CSchool of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430205, P. R. China, College of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024, P. R. ChinaCollege of Chemical Engineering and TechnologyTaiyuan University of TechnologyTaiyuan 030024, P. R. ChinaQingdao Industrial Energy Storage Research InstituteQingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101, P. R. China, Shandong Energy InstituteQingdao 266101, P. R. ChinaCollege of Materials Science and Opto-Electronic TechnologyUniversity of Chinese Academy of SciencesBeijing 100190, P. R. China, Laboratory for Advanced Materials and Electron MicroscopyInstitute of PhysicsChinese Academy of SciencesBeijing 100190, P. R. School of Chemical Engineering and PharmacyWuhan Institute of TechnologyWuhan 430205, P. R. China;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类
  • 关键词

    Li-rich Mn-based cathodes; lithium-ion batteries; oxygen vacancies; swing-like non-isothermal sintering; unstable O_(2p) holes;

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