# Direct and in situ examination of Li+ transport kinetics in isotope labelled solid electrolyte interphase

Source: [Direct and in situ examination of Li+ transport kinetics in isotope labelled solid electrolyte interphase](<https://www.sota2.com/research/paper/68fa44f21e209131ce914e47>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T05:03:11.831Z

Authors: Xiaofei Yu, Stefany Angarita-Gomez, Yaobin Xu, Peiyuan Gao, Jun-Gang Wang, Xin Zhang, Hao Jia, Wu Xu, Xiaolin Li, Yingge Du, Zhijie Xu, Janet S. Ho, Kang Xu, Perla B. Balbuena, Chongmin Wang, Zihua Zhu

Published: 2023-08-09T04:45:31.000Z

## Abstract

Here, using unique in-situ liquid secondary ion mass spectroscopy on isotope-labelled solid-electrolyte-interphase (SEI), assisted by cryogenic transmission electron microscopy and constrained ab initio molecular dynamics simulation, for the first time we answer the question regarding Li+ transport mechanism across SEI, and quantitatively determine the Li+-mobility therein. We unequivocally unveil that Li+ transport in SEI follows a mechanism of successive displacement, rather than "direct-hopping". We further reveal, in accordance with spatial-dependence of SEI structure across the thickness, the apparent Li+ self-diffusivity varies from 6.7\*10-19 m2/s to 1.0\*10-20 m2/s, setting a quantitative gauging of ionic transport behavior of SEI layer against the underlining electrode as well as the rate limiting step of battery operation. This direct study on Li+ kinetics in SEI fills part of the decade-long knowledge gap about the most important component in advanced batteries and provides more precise guidelines to the tailoring of interphasial chemistries for future battery chemistries.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2308.04701>)

[PDF](<https://arxiv.org/pdf/2308.04701.pdf>)