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Ion transport in small-molecule and polymer electrolytes

Son, Chang Yun and Wang, Zhen-Gang (2020) Ion transport in small-molecule and polymer electrolytes. Journal of Chemical Physics, 153 (10). Art. No. 100903. ISSN 0021-9606. doi:10.1063/5.0016163.

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Solid-state polymer electrolytes and high-concentration liquid electrolytes, such as water-in-salt electrolytes and ionic liquids, are emerging materials to replace the flammable organic electrolytes widely used in industrial lithium-ion batteries. Extensive efforts have been made to understand the ion transport mechanisms and optimize the ion transport properties. This perspective reviews the current understanding of the ion transport and polymer dynamics in liquid and polymer electrolytes, comparing the similarities and differences in the two types of electrolytes. Combining recent experimental and theoretical findings, we attempt to connect and explain ion transport mechanisms in different types of small-molecule and polymer electrolytes from a theoretical perspective, linking the macroscopic transport coefficients to the microscopic, molecular properties such as the solvation environment of the ions, salt concentration, solvent/polymer molecular weight, ion pairing, and correlated ion motion. We emphasize universal features in the ion transport and polymer dynamics by highlighting the relevant time and length scales. Several outstanding questions and anticipated developments for electrolyte design are discussed, including the negative transference number, control of ion transport through precision synthesis, and development of predictive multiscale modeling approaches.

Item Type:Article
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URLURL TypeDescription
Son, Chang Yun0000-0002-0784-6565
Wang, Zhen-Gang0000-0002-3361-6114
Additional Information:© 2020 AIP Publishing. Submitted: 4 June 2020 • Accepted: 12 August 2020 • Published Online: 9 September 2020. Z.-G.W. thanks Umi Yamamoto, Brett Savoie, Michael Webb, Tom Miller, and Nitash Balsara for useful discussions on ion transport over the years. DATA AVAILABILITY. All data except those in Fig. 8(b) were from published literature, with the references given in the figure captions. Figure 8(b) was generated from the data in Fig. 8(a) (taken from Ref. 177) using Eq. (4.2). These data are available from the authors upon request.
Issue or Number:10
Record Number:CaltechAUTHORS:20200911-133136426
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105343
Deposited By: George Porter
Deposited On:14 Sep 2020 14:23
Last Modified:16 Nov 2021 18:42

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