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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分层氧化物阴极材料

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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（SIB）最有希望的阴极候选材料之一，P2型层状氧化物面临着挑战，即要在实现长周期寿命的同时实现高倍率性能。在此，提出了一种稳定的Na2 / 3Ni1 / 6Mn2 / 3Cu1 / 9Mg1 / 18O2正极材料，该材料由多层定向堆叠纳米薄片组成，其中镍的位置被铜和镁部分取代，这种材料的特性得到了证实。通过多尺度扫描透射电子显微镜和电子能量损失谱技术。由于采用了最佳的形态结构调制和化学元素替代策略，该电极在Na半电池系统中表现出了卓越的速率性能（在30C下与0.5C相比，在30％的容量保持率）和出色的循环稳定性以及前所未有的完整电池性能。通过电化学行为的系统表征，不同温度下的原位X射线衍射以及Na +脱嵌/插入后的操作X射线衍射，可以清楚地说明潜在的热稳定性，相稳定性和Na +储存机理。出乎意料的是，将准固溶反应转换为绝对固溶反应，并通过在充电/放电过程中进行定量电化学动力学计算证明了电容性Na +存储机理。这种简单有效的策略可能为合理的SIBs的优异速率能力和长周期稳定性阴极材料的合理设计提供新途径。

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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：正极材料;电化学;层状氧化物;纳米薄片;钠离子电池;

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