Differentiating Contributions to “Ion Transfer” Barrier from Interphasial Resistance and Li+ Desolvation at Electrolyte/Graphite Interface
- 6 May 2010
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 26 (13), 11538-11543
- https://doi.org/10.1021/la1009994
Abstract
Efforts were made to differentiate the contributions to the so-called “ion transfer” barrier at the electrolyte/graphite junction from two distinct processes: (1) desolvation of Li+ before it enters graphene interlayer and (2) the subsequent migration of bare Li+ through the ad hoc interphase. By leveraging a scenario where no substantial interphase was formed on Li+ intercalation hosts, we were able to quantify the distribution of “ion transfer” activation energy between these two interfacial processes and hence identify the desolvation process of Li+ as the major energy-consuming step. The result confirmed the earlier belief that the rate-determining step in the charging of a graphitic anode in Li+ intercalation chemistry relates to the stripping of solvation sheath of Li+, which is closely interwoven with the interphasial resistance to Li+ migration.Keywords
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