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A Stable Layered Oxide Cathode Material for High-Performance Sodium-Ion Battery

机译：用于高性能钠离子电池的稳定的层状氧化物阴极材料

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摘要

As one of the most promising cathode candidates for room-temperature sodium-ion batteries (SIBs), P2-type layered oxides face the challenge of simultaneously realizing high-rate performance while achieving long cycle life. Here, a stable Na2/3Ni1/6Mn2/3Cu1/9Mg1/18O2 cathode material is proposed that consists of multiple-layer oriented stacking nanoflakes, in which the nickel sites are partially substituted by copper and magnesium, a characteristic of the material that is confirmed by multiscale scanning transmission electron microscopy and electron energy loss spectroscopy techniques. Owing to the optimal morphology structure modulation and chemical element substitution strategy, the electrode displays remarkable rate performance (73% capacity retention at 30C compared to 0.5C) and outstanding cycling stability in Na half-cell system couple with unprecedented full battery performance. The underlying thermal stability, phase stability, and Na+ storage mechanisms are clearly elucidated through the systematical characterizations of electrochemical behaviors, in situ X-ray diffraction at different temperatures, and operando X-ray diffraction upon Na+ deintercalation/intercalation. Surprisingly, a quasi-solid-solution reaction is switched to an absolute solid-solution reaction and a capacitive Na+ storage mechanism is demonstrated via quantitative electrochemical kinetics calculation during charge/discharge process. Such a simple and effective strategy might reveal a new avenue into the rational design of excellent rate capability and long cycle stability cathode materials for practical SIBs.
机译：作为室温钠离子电池（SIBS）最有前途的阴极候选者之一，P2型分层氧化物面临着同时实现高速性能的挑战，同时实现长循环寿命。在此，提出了一种稳定的Na2 / 3Ni1 / 6Mn2 / 3Cu1 / 9mg1 / 18O2阴极材料，其由多层取向的堆叠纳米薄片组成，其中镍位点被铜和镁部分取代，该特征是确认的材料的特征通过多尺度扫描透射电子显微镜和电子能损光谱技术。由于最佳的形态结构调制和化学元素替代策略，电极显示出显着的速率性能（相比，30℃的容量保持73％，而Na半电池系统中的出色循环稳定性，具有前所未有的全电池性能。通过电化学行为的系统特征，在不同温度下的原位X射线衍射，以及在Na +脱嵌/插入时，通过电化学行为的系统表征清楚地阐明了潜热稳定性，相位稳定性和Na +储存机构。令人惊奇的是，将准固溶体反应切换到绝对固溶体反应，并且在充电/放电过程中通过定量电化学动力学计算来证明电容性Na +储存机构。这种简单有效的策略可能会揭示一种新的途径，以实际SIBs的优异速率能力和长循环稳定性阴极材料的合理设计。

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  • 来源
    《Advanced energy materials》 |2019年第19期|1803978.1-1803978.8|共8页
  • 作者

    Xiao Yao; Zhu Yon-Fong; Yao Hu-Rong; Wang Peng-Fei; Zhang Xu-Dong; Li Hongliang; Yang Xinan; Gu Lin; Li Yong-Chun; Wang Tao; Yin Ya-Xia; Guo Xiao-Dong; Zhong Ben-He; Guo Yu-Guo;

  • 作者单位

    Chinese Acad Sci Inst Chem BNLMS Educ Ctr Excellence Mol Sci CAS Key Lab Mol Nanos Beijing 100190 Peoples R China|Sichuan Univ Sch Chem Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Sch Chem Engn Chengdu 610065 Sichuan Peoples R China;

    Chinese Acad Sci Inst Chem BNLMS Educ Ctr Excellence Mol Sci CAS Key Lab Mol Nanos Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Chem BNLMS Educ Ctr Excellence Mol Sci CAS Key Lab Mol Nanos Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Chem BNLMS Educ Ctr Excellence Mol Sci CAS Key Lab Mol Nanos Beijing 100190 Peoples R China;

    Qingdao Univ Coll Mat Sci & Engn Growing Basis State Key Lab Inst Mat Energy & Environm Lab New Fiber Mat & Mo Qingdao 266071 Shandong Peoples R China;

    Chinese Acad Sci Inst Phys Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Phys Beijing Natl Lab Condensed Matter Phys Beijing 100190 Peoples R China;

    Sichuan Univ Sch Chem Engn Chengdu 610065 Sichuan Peoples R China;

    Qingdao Univ Coll Mat Sci & Engn Growing Basis State Key Lab Inst Mat Energy & Environm Lab New Fiber Mat & Mo Qingdao 266071 Shandong Peoples R China;

    Chinese Acad Sci Inst Chem BNLMS Educ Ctr Excellence Mol Sci CAS Key Lab Mol Nanos Beijing 100190 Peoples R China;

    Sichuan Univ Sch Chem Engn Chengdu 610065 Sichuan Peoples R China;

    Sichuan Univ Sch Chem Engn Chengdu 610065 Sichuan Peoples R China;

    Chinese Acad Sci Inst Chem BNLMS Educ Ctr Excellence Mol Sci CAS Key Lab Mol Nanos Beijing 100190 Peoples R China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    cathode materials; electrochemistry; layered oxides; nanoflakes; sodium-ion batteries;

    机译：阴极材料;电化学;层状氧化物;纳米薄片;钠离子电池;

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