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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy

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Review on Cathode-Electrolyte Interphase for Stabilizing Interfaces in Solid-State Lithium Batteries.

Xinchao Hu¹, Hongfei Zheng¹, Chengkun Zhang²

¹State Key Laboratory of Physical Chemistry of Solid Surface, Fujian Key Laboratory of Surface and Interface Engineering for High Performance Materials, College of Materials, Xiamen University, Xiamen, Fujian, 361005, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)

|November 12, 2025

Summary

Solid-state lithium batteries (SSLBs) face challenges due to complex cathode-electrolyte interphase (CEI) formation and degradation. Understanding CEI mechanisms is crucial for improving SSLB safety and longevity.

Keywords:

CEI regulation cathode‐electrolyte interphase lithium batteries solid‐state electrolyte

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Area of Science:

Materials Science
Electrochemistry
Battery Technology

Background:

Solid-state lithium batteries (SSLBs) offer enhanced safety and energy density.
The cathode-electrolyte interphase (CEI) is critical but poorly understood.
Interfacial issues like high impedance limit SSLB performance.

Purpose of the Study:

To comprehensively review CEI formation and failure mechanisms in SSLBs.
To elucidate the complex nature of the CEI.
To propose strategies for CEI regulation and stability.

Main Methods:

Literature review of existing research on CEI in SSLBs.
Analysis of factors influencing CEI evolution during cycling.
Conceptual framework development for CEI properties.

Main Results:

CEI formation and failure are complex, influenced by cathode and electrolyte properties.
Continuous cycling leads to CEI reconfiguration and degradation.
Current understanding of CEI properties is limited and often underestimated.

Conclusions:

A deeper understanding of CEI is essential for advancing SSLB technology.
An expanded CEI framework aids in analyzing interfacial properties.
Future research should focus on designing stable CEIs for long-lasting SSLBs.