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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.
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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Header DbId: enr
DbLabel: Energy & Power Source
An: 194587914
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
  Group: Ti
  Data: Electrochemical Diagnosis of Cathode Active Material Particle-Size Effects on Interfacial Contact in All-Solid-State Battery Composite Cathodes.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Joo%2C+So-Young%22&quot;&gt;Joo, So-Young&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Shin%2C+Heon-Cheol%22&quot;&gt;Shin, Heon-Cheol&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; hcshin@pusan.ac.kr&lt;/i&gt;
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Energies+%2819961073%29%22&quot;&gt;Energies (19961073)&lt;/searchLink&gt;. Jun2026, Vol. 19 Issue 11, p2526. 23p.
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  Data: *&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Particle+size+determination%22&quot;&gt;Particle size determination&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Solid-solid+interfaces%22&quot;&gt;Solid-solid interfaces&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Solid+state+batteries%22&quot;&gt;Solid state batteries&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Cathodes%22&quot;&gt;Cathodes&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Electrochemical+electrodes%22&quot;&gt;Electrochemical electrodes&lt;/searchLink&gt;&lt;br /&gt;*&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Impedance+spectroscopy%22&quot;&gt;Impedance spectroscopy&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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 &lt; BP &lt; 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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        Value: 10.3390/en19112526
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      – Code: eng
        Text: English
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        PageCount: 23
        StartPage: 2526
    Subjects:
      – SubjectFull: Particle size determination
        Type: general
      – SubjectFull: Solid-solid interfaces
        Type: general
      – SubjectFull: Solid state batteries
        Type: general
      – SubjectFull: Cathodes
        Type: general
      – SubjectFull: Electrochemical electrodes
        Type: general
      – SubjectFull: Impedance spectroscopy
        Type: general
    Titles:
      – TitleFull: Electrochemical Diagnosis of Cathode Active Material Particle-Size Effects on Interfacial Contact in All-Solid-State Battery Composite Cathodes.
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          Name:
            NameFull: Joo, So-Young
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          Name:
            NameFull: Shin, Heon-Cheol
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          Dates:
            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
          Identifiers:
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              Value: 19
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              Value: 11
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            – TitleFull: Energies (19961073)
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