@article{25316,
  keywords = {Diffusion, Lithium compounds, Secondary cells, Electrolysis, Phosphorus compounds, Ultraviolet spectra, Visible spectra},
  author = {Sarah G Stewart and John S Newman},
  title = {The Use of UV/vis Absorption to Measure Diffusion Coefficients in LiPF<sub>6</sub> Electrolytic Solutions},
  abstract = {<p>This work describes the measurement of the diffusion coefficient in lithium-battery electrolytic solutions. We have adapted the method of restricted diffusion to measure diffusion coefficients of LiPF<sub>6</sub> in various solvents using ultraviolet/visible (UV/vis) absorption. The use of UV/vis absorption provides a simple alternative to more arduous experiments and reduces the potential for experimental error due to side reactions. The diffusion coefficient was seen to decrease with concentration according to the following:</p><p><em>D</em> = 3.018 x 10<sup>-5</sup> exp(-0.357c) for LiPF<sub>6</sub> in acetonitrile and <em>D</em> = 2.582 x 10<sup>-5</sup> exp(-2.856c) for LiPF<sub>6</sub> in ethylene carbonate/diethyl carbonate (with <em>D</em> in cm<sup>2</sup>s and <em>c</em> in mol/L). This technique may be useful for any liquid solution with a UV-active species of <em>D</em> greater than 10<sup>-6</sup> cm<sup>2</sup>s.</p>},
  year = {2008},
  journal = {Journal of The Electrochemical Society},
  volume = {155},
  pages = {F13-F16},
  doi = {10.1149/1.2801378 },
  language = {eng},
}