x VPO4x?≤-) between 3.0 and 0.01?V are systematically analyzed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic intermittent titration technique (GITT). The results indicate that the \( {D}_{{\mathrm{Li}}^{+}} \) values depend heavily on the voltage state. Based on the results from EIS and GITT, the diffusion coefficients ( \( {D}_{{\mathrm{Li}}^{+}} \) ) measured in a single-phase region below 1.7?V have relatively steady values of about 10? (EIS) and 10?0 (GITT)?cm2?s?, respectively, while the \( {D}_{{\mathrm{Li}}^{+}} \) values in the single-phase region above 1.9?V decrease rapidly from 10? to 10?1?cm2?s? due to concentration of lithium ions in the bulk LiVPO4F. The Li+ chemical diffusion coefficients measured in the two-phase region by GITT range a lot from 10? to 10?4?cm2?s?, while the \( {D}_{{\mathrm{Li}}^{+}} \) values in the two-phase region determined by CV are around 10?0?cm2?s?. By the GITT, the \( {D}_{{\mathrm{Li}}^{+}} \) values in the two-phase region vary in non-linear shape with the charge–discharge voltage, which is ascribed to strong interactions of Li+ with other ions." />
Systematic investigation on determining chemical diffusion coefficients of lithium ion in Li1--em class="a-plus-plus">x VPO4F (0?≤-em class="a-plus-plus">x?≤-)
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  • 作者：Jiexi Wang ; Xinhai Li ; Zhixing Wang ; Huajun Guo…
  • 关键词：Chemical diffusion coefficient ; Electrochemical impedance spectroscopy ; Cyclic voltammetry ; Galvanostatic intermittent titration technique ; Lithium vanadium fluorophosphate
  • 刊名：Journal of Solid State Electrochemistry
  • 出版年：2015
  • 出版时间：January 2015
  • 年：2015
  • 卷：19
  • 期：1
  • 页码：153-160
  • 全文大小：2,010 KB
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  • 刊物类别：Chemistry and Materials Science
  • 刊物主题：Chemistry
    Physical Chemistry
    Analytical Chemistry
    Industrial Chemistry and Chemical Engineering
    Characterization and Evaluation Materials
    Condensed Matter
    Electronic and Computer Engineering
  • 出版者：Springer Berlin / Heidelberg
  • ISSN：1433-0768
文摘
The chemical diffusion coefficients of lithium ion ( \( {D}_{{\mathrm{Li}}^{+}} \) ) in Li1--em class="a-plus-plus">x VPO4F (0?≤-em class="a-plus-plus">x?≤-) between 3.0 and 0.01?V are systematically analyzed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic intermittent titration technique (GITT). The results indicate that the \( {D}_{{\mathrm{Li}}^{+}} \) values depend heavily on the voltage state. Based on the results from EIS and GITT, the diffusion coefficients ( \( {D}_{{\mathrm{Li}}^{+}} \) ) measured in a single-phase region below 1.7?V have relatively steady values of about 10? (EIS) and 10?0 (GITT)?cm2?s?, respectively, while the \( {D}_{{\mathrm{Li}}^{+}} \) values in the single-phase region above 1.9?V decrease rapidly from 10? to 10?1?cm2?s? due to concentration of lithium ions in the bulk LiVPO4F. The Li+ chemical diffusion coefficients measured in the two-phase region by GITT range a lot from 10? to 10?4?cm2?s?, while the \( {D}_{{\mathrm{Li}}^{+}} \) values in the two-phase region determined by CV are around 10?0?cm2?s?. By the GITT, the \( {D}_{{\mathrm{Li}}^{+}} \) values in the two-phase region vary in non-linear shape with the charge–discharge voltage, which is ascribed to strong interactions of Li+ with other ions.

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