Dynamic structural evolution of oxygen vacancies in lithium rich layered composites cathodes for Li-ion batteries
Dynamic structural evolution of oxygen vacancies in lithium rich layered composites cathodes for Li-ion batteries
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锂离子电池富锂层状复合材料正极中氧空位的动态结构演化
DOI:
10.1016/j.mtphys.2021.100403
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发表时间:
2021-03
影响因子:
11.5
通讯作者:
W. Xu
中科院分区:
文献类型:
--
作者:
S. Tao;W.F. Huang;S.Q. Chu;B. Qian;L.J. Liu;W. Xu
Understanding structural evolution in lithium-rich layered oxidized composites (LLO) is fundamental to design improved cathode materials for rechargeable lithium-ion batteries (LIBs). In particular, retrieving quantitative structural parameters are essential factors to unveil the hidden phases or atomic orderings affecting the properties of LIBs. The oxygen-vacancies heterogeneity is revealed in 0.5Li2MnO3·0.5LiNi1/3Co1/3Mn1/3O2(LR-NCM) during de-lithiation process via rigid structural refinements. Through thein-situ/ex-situX-ray absorption spectroscopy (XAS) in synergy with first principles calculations, the dynamic structural (and electronic) evolution of oxygen vacancies is confirmed to be in the form of MnO2(represents vacancy site) for Li2MnO3component. With the formation of oxygen vacancies in Li2MnO3component, the oxygen-vacancy-bearing structure MnO2also play significant supporting role on its parent structure without obvious Mn ions activity. This result offers new perspectives on synergistic improvement in the electronic and structural evolution, which is the key to design high energy density cathode materials for next-generation lithium ion batteries.
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