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Dr. Yao Xiao Yan-Fang Zhu Dr. Wei Xiang Dr. Zhen-Guo Wu Yong-Chun Li Jing Lai Shi Li Dr. Enhui Wang Zu-Guang Yang Chun-Liu Xu Prof. Ben-He Zhong Prof. Xiao-Dong Guo 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(4):1507-1511
Demands for large-scale energy storage systems have driven the development of layered transition-metal oxide cathodes for room-temperature rechargeable sodium ion batteries (SIBs). Now, an abnormal layered-tunnel heterostructure Na0.44Co0.1Mn0.9O2 cathode material induced by chemical element substitution is reported. By virtue of beneficial synergistic effects, this layered-tunnel electrode shows outstanding electrochemical performance in sodium half-cell system and excellent compatibility with hard carbon anode in sodium full-cell system. The underlying formation process, charge compensation mechanism, phase transition, and sodium-ion storage electrochemistry are clearly articulated and confirmed through combined analyses of in situ high-energy X-ray diffraction and ex situ X-ray absorption spectroscopy as well as operando X-ray diffraction. This crystal structure engineering regulation strategy offers a future outlook into advanced cathode materials for SIBs. 相似文献
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Yan-Fang Zhu Dr. Yao Xiao Dr. Wei-Bo Hua Dr. Sylvio Indris Prof. Shi-Xue Dou Prof. Yu-Guo Guo Prof. Shu-Lei Chou 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(24):9385-9390
Structural evolution of the cathode during cycling plays a vital role in the electrochemical performance of sodium-ion batteries. A strategy based on engineering the crystal structure coupled with chemical substitution led to the design of the layered P2@P3 integrated spinel oxide cathode Na0.5Ni0.1Co0.15Mn0.65Mg0.1O2, which shows excellent sodium-ion half/full battery performance. Combined analyses involving scanning transmission electron microscopy with atomic resolution as well as in situ synchrotron-based X-ray absorption spectra and in situ synchrotron-based X-ray diffraction patterns led to visualization of the inherent layered P2@P3 integrated spinel structure, charge compensation mechanism, structural evolution, and phase transition. This study provides an in-depth understanding of the structure-performance relationship in this structure and opens up a novel field based on manipulating structural evolution for the design of high-performance battery cathodes. 相似文献
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