標題: Structural Evolution of a Na/NaFePO4 Sodium-ion Battery during Discharge Determined by in-situ Synchrotron X-ray Diffraction
作者: Huang, E-Wen
Wang, Yi-Chen
Chang, Jeng-Kuei
Lee, Tai-Chou
Liao, Tzu-Kang
Wu, Tsai-Ling
Hung, Yi-Chun
Huang, Ping-Yuan
Liao, Yang-Hung
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Na/NaFePO4;Sodium-ion Battery;in-situ Synchrotron X-ray Diffraction;Discharge
公開日期: 1-六月-2015
摘要: In this study, a newly-developed Na/NaFePO4 cell is studied. We charge the cell up to 2.4V and then apply in-situ synchrotron x-ray diffraction to resolve structural evolution during discharge. An intermediate of NaxFePO(4) diffracts strongest x-ray intensity among all the components of the cell, During discharging, several (hkl) planes of the NaxFePO(4) phase of the cathode are found to expand. The expansion of the cathode-lattice size suggests a Na-insertion mechanism. Upon the lattice expansion, a peak-profile analysis shows a correlation between the increase of the peak-intensity and the decrease of the peak-width evolution. The correlation suggests that there is more well-defined NaxFePO(4) formed during the discharge. Coupled with the Na insertion, the discharge of the Na/NaFePO4 cell shows a convolution of mechano-chemical reaction. Moreover, the time-resolved measurements reveal an asynchronous lattice-strain fluctuations within a stepwise discharge plateau.
URI: http://hdl.handle.net/11536/127901
ISSN: 0257-9731
期刊: JOURNAL OF THE CHINESE SOCIETY OF MECHANICAL ENGINEERS
Volume: 36
起始頁: 271
結束頁: 274
顯示於類別:期刊論文