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  4. Electronic and ionic properties of sintered cathode of LiNi0.6Mn0.2Co0.2O2 (NCM622)
 
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2022
Journal Article
Titel

Electronic and ionic properties of sintered cathode of LiNi0.6Mn0.2Co0.2O2 (NCM622)

Abstract
Li-ion solid-state batteries have the potential for high energy densities and improved safety. Oxidic all solid-state batteries require co-sintering of the Li-ion conductive solid electrolyte, the active electrode material, and an electronic conductive additive to give a composite electrode. A first step for the realization of this complex system is the study of the sintering behavior of the active material itself as a single-phase component and to investigate the electrochemical activity as well as the electronic properties after heat treatment. In this study monolithic NCM622 cathodes with a thickness of about 90 μm were sintered at temperatures up to 900°C by using a low-melting glass as sintering additive. For these ceramic cathodes sintered at T = 800°C, an electronic conductivity of 3.0 × 10-3 S cm-1 and six orders of magnitude lower Li-ion conductivity of about 10-9 S cm-1 were determined by DC conductivity measurement. To investigate the electrochemical performance of the sintered cathode material, the porous microstructure was infiltrated with liquid electrolyte and a charging capacity of 140 mAh g-1 (92% of the theoretical capacity) was measured with C/50 cycling rate. In comparison, the electrochemical performance without infiltration of a Li-ion conductive liquid was tested with polyethylene oxide as polymeric separator. With these measurements the ability of the sintered cathode to charge/discharge as well as to provide sufficient high electronic conductivity has been demonstrated.
Author(s)
Wätzig, Katja
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Hüttl, Juliane
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Gödeke, Dieter
Ferro GmbH
Schilm, Jochen
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Nikolowski, Kristian
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Partsch, Mareike
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Zeitschrift
International journal of ceramic engineering & science
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DOI
10.1002/ces2.10155
Language
English
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Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Tags
  • Li-ion battery

  • NCM622

  • sintered cathode

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