記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Carbon Society of Japan  

<p>The electronic resistance of composite electrodes for lithium-ion batteries has a non-negligible effect on the charge–discharge performance at high rates. In order to obtain an electrode with a high-rate performance it is important that conductive materials, such as acetylene black (AB), in the electrode slurry form a good electron conduction network. This study evaluated the electron conduction network of various electrode slurries made using different processes and with different solid contents using electronic conductivity measurements of the electrode slurries. The conductivity of the slurry showed a correlation with the rate performance. Depending on the production method and solid content, the conductivity of the slurry changed. The results suggest that the electron conduction network of the slurry is modified by collisions between the AB and active material particles during kneading and by stirring the slurry with excess solvent during dispersion. Measuring the conductivity of the slurry is expected to help determine the conditions of its manufacture.</p>

DOI： 10.7209/carbon.020201

CiNii Research

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Physical Chemistry Chemical Physics  

Molecular dynamic (MD) simulations have been performed for 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([C4mim+][TFSA−]), an ionic liquid (IL), on a charged graphene electrode to achieve the quantitative analysis of the static differential capacitance using the electrochemical surface plasmon resonance (ESPR). The MD simulations have provided the surface charge density on the electrode and ionic distributions in the electric double layer, both of which are indispensable for the evaluation of static differential capacitance using ESPR but are difficult to be measured by experimental techniques. This approach has allowed the quantitative analysis and explanation of the SPR angle shift in ESPR. The major contribution to the SPR angle shift is found to be the change in ionic concentrations of the first ionic layer on the electrode, owing to higher polarizabilities of ions in the first ionic layer than those in the overlayers. Moreover, the ionic orientation on the electrode and ionic multilayer structure have also been investigated in detail. The butyl group of C4mim+in the first ionic layer is found to provide extra room for C4mim+in the second ionic layer but exclude TFSA−, which affects the interval and regularity of ionic multilayers.

DOI： 10.1039/d1cp01435h

Web of Science

Scopus

PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Electrochemistry  

The mixing process of electrode-slurry plays an important role in the electrode performance of lithium-ion batteries (LIBs). The dispersion state of conductive materials, such as acetylene black (AB), in the electrode-slurry directly influences the electronic conductivity in the composite electrodes. In this study, the relation between the mixing process of electrode-slurry and the internal resistance of the composite electrode was investigated in combination with the characterization of the electrodeslurries by the rheological analysis and the alternating current (AC) impedance spectroscopy. Some of the electrode-slurries showed higher value and gentler slope of the dynamic storage modulus in the low-angular-frequency region and higher thixotropic index than the others depending on the way of the mixing process and the AB content, agreeing with the low electronic volume resistivities of the corresponding composite electrodes and the electrode-slurries, which indicates the AB network growth. The results suggested that the low-viscosity state when AB and active electrode material are mixed contributes to the dispersive AB network.

DOI： 10.5796/electrochemistry.21-00076

Web of Science

Scopus

CiNii Research

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.jpcb.0c03711

Web of Science

Scopus

PubMed

記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1021/acs.jpcc.0c00795

Web of Science

開催年月日： 2024年3月

記述言語：日本語   会議種別：口頭発表（一般）  

開催年月日： 2024年3月

記述言語：日本語   会議種別：口頭発表（一般）  

開催年月日： 2023年11月

記述言語：日本語   会議種別：口頭発表（一般）  

開催年月日： 2023年11月

記述言語：日本語   会議種別：口頭発表（一般）  

開催年月日： 2023年11月

記述言語：日本語   会議種別：口頭発表（一般）