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Solid-State Electrolytes with Ce-Doped LiNbO3 Nanofiber Fillers Enable High-Performance Lithium Metal Batteries
Zhanghao Cheng1, Siyao Li1, Xingying Wu1
1School of Chemical & Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, P. R. China.
ACS Applied Materials & Interfaces
|March 6, 2026
Summary
Ce-doped lithium niobate nanofibers enhance poly(vinylidene fluoride-co-hexafluoropropylene) electrolytes, improving ionic conductivity and mechanical strength for stable solid-state lithium metal batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) is a common composite electrolyte matrix for solid-state lithium metal batteries.
- PVDF-HFP's limited mechanical strength hinders its ability to suppress lithium dendrite growth, impacting battery performance.
- Incorporating fillers is crucial for enhancing ionic conductivity and mechanical robustness of composite electrolytes.
Purpose of the Study:
- To investigate the use of lithium niobate (LiNbO3) and Ce-doped lithium niobate (LiNb0.9Ce0.1O3) nanofibers as fillers in PVDF-HFP electrolytes.
- To improve the ionic conductivity, mechanical properties, and lithium dendrite suppression capabilities of the composite solid electrolyte.
- To evaluate the performance of full cells utilizing the enhanced composite solid electrolyte.
Main Methods:
- Synthesis of LiNbO3 and LiNb0.9Ce0.1O3 nanofibers.
- Fabrication of PVDF-HFP based composite solid electrolytes (CSE) incorporating the nanofibers.
- Characterization of ionic conductivity, Li+ transference number, and mechanical properties.
- Testing of lithium symmetric cells for dendrite suppression capability.
- Assembly and cycling performance evaluation of LiFePO4 and LiNi0.8Co0.1Mn0.1O2 based full cells.
Main Results:
- LiNb0.9Ce0.1O3 nanofibers enhanced lithium salt dissociation, improving ionic conductivity and Li+ transference number in the CSE.
- The composite solid electrolyte with LiNb0.9Ce0.1O3 nanofibers (LNCO CSE) demonstrated excellent lithium dendrite suppression, enabling stable operation of lithium symmetric cells at 0.1 mA cm-2 for over 1100 hours.
- Li||LNCO CSE||LiFePO4 full cells showed high reversible specific capacity (136.9 mAh g-1 after 600 cycles at 1C) and good rate performance.
- Li||LNCO CSE||LiNi0.8Co0.1Mn0.1O2 full cells achieved 74.1% capacity retention after 500 cycles at 0.5 C.
Conclusions:
- Ce-doped lithium niobate nanofibers are effective fillers for enhancing PVDF-HFP based composite solid electrolytes.
- The improved electrolyte exhibits superior ionic conductivity, mechanical robustness, and dendrite suppression.
- The developed LNCO CSE shows significant promise for high-performance and long-lasting solid-state lithium metal batteries.
