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Focused Ion Beam Fabrication of LiPON-based Solid-state Lithium-ion Nanobatteries for In Situ Testing
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Modulating physicochemical interfaces enables li-rich oxides based ceramic solid-state li batteries under ambient
Xinchao Hu1, Shuqi Shen1, Jiantao Li2,3
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, China.
Nature Communications
|October 22, 2025
Summary
This study introduces a novel gel polymer electrolyte for high-energy solid-state lithium metal batteries. It enhances interface stability, enabling high performance and longevity in demanding applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Li-rich layered oxides are promising for high-energy solid-state lithium metal batteries.
- High voltage operation leads to oxidative oxygen species, challenging electrode interface stability.
Purpose of the Study:
- To design a robust in-situ polymerization gel polymer electrolyte for interface modification.
- To enhance the electrochemical stability and performance of Li-rich layered oxide batteries.
Main Methods:
- Developed a gel polymer electrolyte with bifunctional additives (lithium difluoro(oxalate) borate and LiPO2F2).
- Investigated additive effects on Li+ chemical environment, crosslink density, and gas generation.
- Evaluated electrochemical stability window, Li+ transference number, and interfacial properties.
Main Results:
- The electrolyte demonstrated a wide electrochemical stability window (up to 4.7 V) and high Li+ transference number (0.82).
- Additives reduced gas generation and contact loss, preventing interfacial impedance divergence.
- F- and B-rich interphase formation effectively inhibited side reactions and material loss.
Conclusions:
- The modified gel polymer electrolyte significantly enhances interface stability in Li-rich layered oxide batteries.
- Achieved high discharge capacity (276.5 mAh g-1) and excellent cycling stability (81.7% retention after 100 cycles).
- Presents a viable strategy for developing advanced high-voltage solid-state lithium metal batteries.
