Related Experiment Video
Updated: Jun 28, 2026
10:58
Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
Published on: March 7, 2018
New Perspective on the Development of Stable, High-Power-Density 5 V-Class All-Solid-State Lithium-Ion Batteries.
Zhili Liang1, Enkhtsetseg Dashjav2, Frank Tietz2
1Advanced Thin Film Technology Group, Institute of Materials Science, Technical University of Darmstadt, 64287 Darmstadt, Germany.
ACS Applied Materials & Interfaces
|June 26, 2026
Summary
Interface engineering is key for all-solid-state batteries (ASSBs). Optimizing the anode/electrolyte interface significantly improves cycling stability and electrochemical performance, enabling high-voltage operation.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- All-solid-state batteries (ASSBs) offer potential advantages over conventional lithium-ion batteries.
- Understanding and controlling interfacial phenomena is critical for ASSB performance and stability.
- The LiCoPO4 (LCP) or LiCoO2 cathode, Li1+xAlxTi2-x(PO4)3 (LATP) solid electrolyte, and lithium metal anode system is investigated.
Purpose of the Study:
- To systematically investigate the correlation between electrochemical performance and interfacial electronic structure/chemical composition in ASSBs.
- To identify the limiting factors for electrochemical activity at the cathode/electrolyte and anode/electrolyte interfaces.
- To explore interface engineering strategies for enhancing ASSB cycling stability and performance.
Main Methods:
- Fabrication of ASSBs using thin-film LiCoPO4 (LCP) or LiCoO2 cathodes, Li1+xAlxTi2-x(PO4)3 (LATP) solid electrolyte, and lithium metal anode.
- X-ray photoelectron spectroscopy (XPS) for in-situ and post-cycling analysis of cathode/electrolyte and anode/electrolyte interfaces.
- Electrochemical testing to evaluate battery performance, cycling stability, and rate capability.
Main Results:
- XPS revealed electronic charge transfer from LCP to LATP, causing partial Ti4+ reduction without PO4 polyanion involvement.
- The anode/electrolyte interface, specifically the Li|LATP interface, was identified as the primary limitation to electrochemical activity.
- Post-cycling XPS showed chemical inhomogeneity and Li+ accumulation at the Li|LATP interface.
- Interface engineering, including LiPON or LiTFSI-PEO coatings, significantly improved cycling stability.
- Optimized cells demonstrated excellent cycling performance between 3.0 and 5.0 V, with stable cycling over extended periods at various rates (up to 5C).
Conclusions:
- The anode/electrolyte interface chemistry and homogeneity are crucial for the performance of ASSBs.
- Engineering the Li|LATP interface is an effective strategy to enhance the cycling stability and electrochemical performance of ASSBs.
- The optimized ASSBs exhibit promising potential for high-voltage applications due to their stable and efficient cycling.
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