Electrochemical Diagnosis of Cathode Active Material Particle-Size Effects on Interfacial Contact in All-Solid-State Battery Composite Cathodes.
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| Title: | Electrochemical Diagnosis of Cathode Active Material Particle-Size Effects on Interfacial Contact in All-Solid-State Battery Composite Cathodes. |
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| Authors: | Joo, So-Young1 (AUTHOR), Shin, Heon-Cheol1 (AUTHOR) hcshin@pusan.ac.kr |
| Source: | Energies (19961073). Jun2026, Vol. 19 Issue 11, p2526. 23p. |
| Subject Terms: | *Particle size determination, *Solid-solid interfaces, *Solid state batteries, *Cathodes, *Electrochemical electrodes, *Impedance spectroscopy |
| Abstract: | Quantitative evaluation of the interfacial contact characteristics between the cathode active material (CAM) and solid electrolyte (SE) in all-solid-state battery (ASSB) composite cathodes is essential for improving electrochemical performance. In this study, a previously proposed integrated galvanostatic method (GM)-electrochemical impedance spectroscopy (EIS) framework for analyzing the electrochemically active area (EAA) was applied to particle-size-controlled composite cathodes to examine how particle-size design influences interfacial contact in practical ASSB composite cathodes. Specifically, three cathodes were examined: a small-particle Ni-rich layered oxide cathode (SP), a large-particle Ni-rich layered oxide cathode (LP), and a bimodal cathode containing an equal-weight mixture of the two particle fractions (BP). An area-independent lithium diffusion coefficient was first determined from the Warburg-blocking transition in the impedance response. The EAA of each cathode was then obtained by combining this reference value with the area-sensitive galvanostatic response in a one-step constraining procedure. Although bimodal particle-size distributions are often expected to improve interfacial contact by combining the advantages of small and large particles, the EAA increased in the order of SP < BP < LP. This result indicates that under the present electrode configuration, the LP cathode secured the most effective CAM–SE interfacial contact and the highest effective surface coverage. Consistent with this trend, the LP cathode exhibited the best rate capability under high-rate conditions. These results demonstrate that the GM–EIS-based EAA analysis framework provides a practical quantitative tool for evaluating particle-size-dependent interfacial contact and guiding microstructure optimization in ASSB composite cathodes. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Abstract: | Quantitative evaluation of the interfacial contact characteristics between the cathode active material (CAM) and solid electrolyte (SE) in all-solid-state battery (ASSB) composite cathodes is essential for improving electrochemical performance. In this study, a previously proposed integrated galvanostatic method (GM)-electrochemical impedance spectroscopy (EIS) framework for analyzing the electrochemically active area (EAA) was applied to particle-size-controlled composite cathodes to examine how particle-size design influences interfacial contact in practical ASSB composite cathodes. Specifically, three cathodes were examined: a small-particle Ni-rich layered oxide cathode (SP), a large-particle Ni-rich layered oxide cathode (LP), and a bimodal cathode containing an equal-weight mixture of the two particle fractions (BP). An area-independent lithium diffusion coefficient was first determined from the Warburg-blocking transition in the impedance response. The EAA of each cathode was then obtained by combining this reference value with the area-sensitive galvanostatic response in a one-step constraining procedure. Although bimodal particle-size distributions are often expected to improve interfacial contact by combining the advantages of small and large particles, the EAA increased in the order of SP < BP < LP. This result indicates that under the present electrode configuration, the LP cathode secured the most effective CAM–SE interfacial contact and the highest effective surface coverage. Consistent with this trend, the LP cathode exhibited the best rate capability under high-rate conditions. These results demonstrate that the GM–EIS-based EAA analysis framework provides a practical quantitative tool for evaluating particle-size-dependent interfacial contact and guiding microstructure optimization in ASSB composite cathodes. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 19961073 |
| DOI: | 10.3390/en19112526 |
