Detection of highly conductive pathways in LiMn2O4–carbon black composites for Li ion batteries by microcontact impedance spectroscopy
作者： A Sever Skapin , M Gaberscek , R Dominko , M Bele , J Drofenik
DOI: 10.1016/J.SSI.2004.01.018
关键词: Scanning electron microscope 、 Composite material 、 Polarization (electrochemistry) 、 Cathode 、 Materials science 、 Composite number 、 Microelectrode 、 Dielectric spectroscopy 、 Ion 、 Carbon black
摘要: Abstract The arrangement of carbon black around active particles in LiMn 2 O 4 composite cathodes is studied by using EDS analysis, scanning electron microscopy (SEM) and microelectrode impedance spectroscopy. It shown that a uniform distribution the reflected normal-like locally probed resistances particles. If non-uniformly arranged (that is, it tends to form agglomerates within composite), then bi-modal local obtained. normal-distribution case leads considerably lower polarization and, consequently, higher cathode capacities at given current densities.
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