Differentiating contributions to "ion transfer" barrier from interphasial resistance and Li+ desolvation at electrolyte/graphite interface.
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.
Xu
Kang
K
Electrochemistry Branch, Power and Energy Division, U.S. Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, USA. cxu@arl.army.mil
von Cresce
Arthur
A
Lee
Unchul
U