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Updated: Mar 13, 2026

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
From Interphase to Interface: Revealing the Dynamic Evolution of Interfacial Electrolyte Configuration and Solid
Yuran Yang1, Junhao Wang1, Haiyan Luo1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, P. R. China.
High temperatures cause anion escape from lithium metal battery interfaces, forming unstable solid electrolyte interphase (SEI) layers. Strategies to reduce anion loss improve battery cycling and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Durable cycling in lithium metal batteries at elevated temperatures requires a stable interfacial environment.
- Limited mechanistic understanding of high-temperature effects on interfacial electrolyte configuration and solid electrolyte interphase (SEI) formation hinders electrolyte design.
Purpose of the Study:
- To elucidate the dynamic evolution of the interfacial electrolyte configuration and SEI at elevated temperatures.
- To understand the role of anion escape in SEI formation and its impact on battery performance.
- To identify strategies for mitigating high-temperature-induced interfacial degradation.
Main Methods:
- Utilized surface-sensitive in situ infrared spectroscopies to directly visualize interfacial processes.
- Investigated the influence of elevated temperatures on anion behavior at the electrolyte-electrode interface.
- Evaluated the effects of modifying anion transference number and introducing inert cations.
Main Results:
- Direct visualization of anion escape from the interface, driven by charge imbalance during desolvation, accelerated at elevated temperatures.
- Formation of an anion-lean, solvent-rich interface, leading to more solvent-derived and fewer anion-derived SEI components.
- Aggravated interfacial resistance and compromised stability at higher temperatures due to anion escape.
Conclusions:
- Anion escape is a key mechanism for interfacial degradation in lithium metal batteries at elevated temperatures.
- Reducing anion transference number and introducing inert cations effectively mitigate anion escape and restore SEI stability.
- This work enables fundamental regulation of the interface for improved electrolyte and interfacial engineering in high-performance batteries.
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