Dr. Chia-Ching LinTaiwan
National Institute for Materials Science
| 2023/10 to present | | Postdoctoral researcher, International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS) |
| 2019 - 2021 | | Ph.D, Department of Materials Science and Engineering, National Tsing Hua University, Taiwan |
| 2016 - 2018 | | Master of Science, Department of Materials Science and Engineering, National Tsing Hua University, Taiwan |
| 2022/01 - 2023/07 | | R&D Process Integration Engineer, TSMC |
Lithium-ion Batteries, Cathodes, Advanced Electrode Materials, Electrochemical Kinetics, Synchrotron X-ray analysis.
In-situ X-ray studies of high-entropy layered oxide cathode for sodium-ion batteries
TBA TBA
Beyond Lithium-Ion Batteries/TBA
High-entropy oxides (HEOs) show considerable potential as stable cathode materials for sodium-ion batteries. In this study, we present a O3-type layered HEO, NaCu0.1Ni0.3Fe0.2Mn0.2Ti0.2O2 (NCNFMT). Analysis using extended X-ray absorption fine structure (EXAFS) and energy-dispersive spectroscopy confirmed that the transition metal ions are well-dispersed, forming a homogeneous solid-solution phase. During battery testing, the NCNFMT cathode delivered a reversible capacity of 130 mAh g-1 and achieved a 95% energy efficiency. It also maintained excellent long-term stability, retaining 71% of its capacity after 500 cycles at a 0.5C rate. Most importantly, operando X-ray techniques revealed that the high-entropy effect delays the severe phase transitions that typically cause capacity fading in O3-type cathodes. These results highlight the promise of utilizing high-entropy strategies to design durable, phase-stable energy storage materials.