TY - JOUR
T1 - Effect of Cu/Fe addition on the microstructures and electrical performances of Ni–Co–Mn oxides
AU - Jeon, Jae Eun
AU - Park, Kyoung Ryeol
AU - Kim, Kang Min
AU - Ahn, Chisung
AU - Lee, Jaewoong
AU - Yu, Dong Yurl
AU - Bang, Junghwan
AU - Oh, Nuri
AU - Han, Hyuksu
AU - Mhin, Sungwook
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/4/5
Y1 - 2021/4/5
N2 - The reliability of negative temperature coefficient (NTC) thermistors is one of the important factors for the excellent performance of the battery management system in electric vehicles. The electrical properties of the thermistor can be explained by the indirect electron jump between Mn3+ and Mn4+ at the B-sites in a spinel-type thermistor. Additionally, different types of dopants, such as Fe, Cu, Zn, Cr, and Mn, are considered as electrical modifiers that can further improve the electrical properties of the thermistor. For example, Cu is often added to NTC thermistors, occupying the octahedral sites in a spinel-type thermistor, which can play an important role in conduction with the Mn cations. Addition of Fe is also widely used in NTC thermistors owing to its high sensitivity, B constant, and stability. In this study, composition-dependent structural and electrical properties of Cu0.2/Fey-co-doped Ni0.3Mna-x-yCo0.9O4 (NMC) are investigated. Cu/Fe-co-doped NMC shows the R25 and B25/85 constant values of 4490–12730 Ω and 3185–3490 K, respectively, exhibiting a typical ρ–T curve of NTC thermistors. Higher B constant and reliable electrical stability are observed for Cu/Fe-co-doped NMC. Based on the relationship between the cationic oxidation states and electrical properties of Cu/Fe-co-doped NMC, the hopping conduction mechanism is discussed.
AB - The reliability of negative temperature coefficient (NTC) thermistors is one of the important factors for the excellent performance of the battery management system in electric vehicles. The electrical properties of the thermistor can be explained by the indirect electron jump between Mn3+ and Mn4+ at the B-sites in a spinel-type thermistor. Additionally, different types of dopants, such as Fe, Cu, Zn, Cr, and Mn, are considered as electrical modifiers that can further improve the electrical properties of the thermistor. For example, Cu is often added to NTC thermistors, occupying the octahedral sites in a spinel-type thermistor, which can play an important role in conduction with the Mn cations. Addition of Fe is also widely used in NTC thermistors owing to its high sensitivity, B constant, and stability. In this study, composition-dependent structural and electrical properties of Cu0.2/Fey-co-doped Ni0.3Mna-x-yCo0.9O4 (NMC) are investigated. Cu/Fe-co-doped NMC shows the R25 and B25/85 constant values of 4490–12730 Ω and 3185–3490 K, respectively, exhibiting a typical ρ–T curve of NTC thermistors. Higher B constant and reliable electrical stability are observed for Cu/Fe-co-doped NMC. Based on the relationship between the cationic oxidation states and electrical properties of Cu/Fe-co-doped NMC, the hopping conduction mechanism is discussed.
KW - B constant
KW - Cu/Fe co-doping
KW - Electrical performance
KW - Hopping conduction mechanism
KW - Ni–Mn–Co oxide
KW - NTC thermistor
UR - http://www.scopus.com/inward/record.url?scp=85095736929&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2020.157769
DO - 10.1016/j.jallcom.2020.157769
M3 - Article
AN - SCOPUS:85095736929
SN - 0925-8388
VL - 859
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 157769
ER -