Potential dependent EIS investigation of FeF3?·-.33H2O/C nano-composite synthesized by one-step solid-state method

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• 作者：Chao Chen ; Shu Chen ; Xiaoping Xu ; Miao Shui ; Weidong Zheng ; Jie Shu ; Yuanlong Ren
• 关键词：FeF3?·-.33H2O ; EIS ; Potential dependent ; Equivalent circuit
• 刊名：Ionics
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：21
• 期：8
• 页码：2247-2252
• 全文大小：987 KB
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• 作者单位：Chao Chen (1)
  Shu Chen (1)
  Xiaoping Xu (1)
  Miao Shui (1)
  Weidong Zheng (1)
  Jie Shu (1)
  Yuanlong Ren (1)
  
  1. The State Key Laboratory Base of Novel Functional Materials and Preparation Science, The Faculty of Materials Science and Chemical Engineering, Ningbo University, Ningbo, 315211, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Electrochemistry
  Materials Science
  Physical Chemistry
  Condensed Matter
  Renewable Energy Sources
  Electrical Power Generation and Transmission
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1862-0760

文摘

To further study the lithium ion transportation behavior of cathode material FeF3?·-.33H2O/C synthesized by a simple one-step chemico-mechanical method, the Electrochemical impedance spectrum (EIS) measured at series of open-circuit voltages were investigated in detail. The results showed that the EIS profiles of FeF3?·-.33H2O/C materials were strongly potential dependent. The equivalent circuit parameters obtained by fitting the experimental data as a function of open-circuit voltage (OCV) level were depicted. The ohmic resistance R0, solid electrolyte inter-phase resistance R SEI, electronic conduction resistance R E, charge transfer resistance R R, and Q parameter of CPE circuit characteristic of Li+ diffusion Q diff all showed a sudden change at the OCV level 2.5?V. Ohmic resistance R0 had a relatively lower resistance of ca. 10?Ω above OCV level 2.5?V and a higher resistance of about 40?Ω below 2.5?V. Similar situation was also observed for R SEI, which was around 20?Ω above 2.5?V and soared up quickly when the equilibrium potential fell below 2.5?V. Similar variations were also observed for R E and R R. A high resistance of ca. 410 and 520?Ω was obtained at OCV level 2.05?V, respectively. Q diff showed a convex profile, which matched the variation of Li+ diffusion coefficient well.