Related Experiment Video
Updated: Aug 6, 2026
Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
Stable Nickel-Rich Layered Oxide Cathodes Enabled by Conformal AlF3 Nanoshell for High-Voltage All-Solid-State
Si-Jie Guo1, Si-Qi Lu1,2, Jin-Xiang Fan1,2
1CAS Key Laboratory of Molecular Nanostructure and Nanotechnology, and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, P. R. China.
Surface modification of nickel-rich layered oxides (NCM811) with aluminum fluoride (AlF3) nanoshells enables stable high-voltage operation in chloride-based solid-state batteries. This strategy enhances interfacial stability and battery performance up to 4.8 V.
Area of Science:
- Materials Science
- Electrochemistry
- Battery Technology
Background:
- Chloride-based solid-state electrolytes (SSEs) offer high ionic conductivity and oxidative stability for all-solid-state batteries (ASSBs).
- Integrating SSEs with high-nickel layered oxides like LiNi0.8Co0.1Mn0.1O2 (NCM811) is challenging due to poor interfacial stability at high voltages.
- This instability leads to performance degradation in ASSBs.
Purpose of the Study:
- To enhance the interfacial and structural stability of NCM811 cathodes when paired with chloride-based SSEs.
- To enable stable operation of ASSBs at high voltages (up to 4.8 V).
- To develop a generalizable method for improving high-energy storage devices.
Main Methods:
- Surface modification of NCM811 particles using conformal aluminum fluoride (AlF3) nanoshells.
- A novel solution-based route to synthesize a uniform (NH4)3AlF6 precursor nanoshell.
- Subsequent conversion of the precursor to AlF3 via sintering.
- Electrochemical cycling and performance evaluation of the modified NCM811 in chloride-based SSE (Li3InCl6) ASSBs.
Main Results:
- Stable battery operation achieved at voltages up to 4.8 V using AlF3-modified NCM811 and Li3InCl6 SSE.
- The AlF3 nanoshell enhances NCM811 structural robustness and suppresses interfacial electrolyte decomposition.
- Demonstrated excellent rate capability (3 C) and prolonged cyclability (≥1000 cycles).
- Overcame synthetic challenges associated with creating uniform AlF3 coatings.
Conclusions:
- Surface modification with AlF3 nanoshells is critical for achieving high-voltage stability in chloride-based ASSBs.
- The developed synthetic route provides a generalizable pathway for designing stable, high-energy density batteries.
- This approach significantly improves the performance and longevity of NCM811-based ASSBs.
