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Updated: Jun 3, 2026

In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries
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Published on: November 10, 2014

Spatiochemical Segregation in Porous Lithium-Metal Interphases.

Weilai Yu1,2, Hao Lyu1, Donglin Li3

  • 1Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States.

Journal of the American Chemical Society
|June 1, 2026
PubMed
Summary
This summary is machine-generated.

The solid-electrolyte interphase (SEI) in lithium metal batteries exhibits spatiochemical segregation during plating and stripping. This process creates a porous framework that retains electrolyte, impacting battery stability.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Battery Technology

Background:

  • The solid-electrolyte interphase (SEI) is crucial for lithium metal battery performance.
  • Understanding SEI formation during lithium plating/stripping is vital but poorly understood.

Purpose of the Study:

  • To investigate the spatiochemical evolution of the SEI during lithium plating and stripping.
  • To elucidate the relationship between SEI chemistry, architecture, and mechanical behavior.

Main Methods:

  • Utilized a 1,2-dimethoxyethane (DME)/1 M lithium bis(fluorosulfonyl)imide (LiFSI) electrolyte system.
  • Employed correlative X-ray photoelectron spectroscopy, SEM, NanoSIMS, and synchrotron X-ray absorption spectroscopy.

Main Results:

  • Observed spatiochemical segregation of SEI products into heterogeneous domains.
  • Identified enrichment of LiF-dominated inorganic species spatially decoupled from oxygen-containing phases.
  • Demonstrated mechanical reorganization into a porous, electrolyte-retaining framework during stripping.

Conclusions:

  • SEI evolution is governed by coupled chemo-mechanical processes.
  • Spatiochemical segregation dictates SEI composition, architecture, and permeability.
  • Findings suggest strategies to improve SEI stability and electrolyte retention in lithium-metal batteries.