TY - JOUR
T1 - Low resistance at LiNi1/3Mn1/3Co1/3O2 and Li3PO4 interfaces
AU - Nishio, Kazunori
AU - Nakamura, Naoto
AU - Horiba, Koji
AU - Kitamura, Miho
AU - Kumigashira, Hiroshi
AU - Shimizu, Ryota
AU - Hitosugi, Taro
N1 - Funding Information:
This research was supported by JST-CREST Grant No. JPMJCR1523 and Toyota Motor Corporation. K.N. acknowledges funding from JSPS Kakenhi Grant Nos. 17H06674 and 18K14314. T.H. acknowledges funding from JKA Grant No. 109 and JSPS Kakenhi Grant No. 18H03876. We thank Toray Research Center, Inc. for the RBS-PIXE measurements. Raman spectroscopy measurements were performed at Ookayama Materials Analysis Division, Technical Department, Tokyo Institute of Technology. We would like to thank Editage (www.editage.jp) for English language editing.
Publisher Copyright:
© 2020 Author(s).
PY - 2020/2/3
Y1 - 2020/2/3
N2 - We report the low resistance observed at the interface of LiNi1/3Mn1/3Co1/3O2 (NMC) and Li3PO4. First, we show the deposition of high-quality single-phase NMC (001) epitaxial thin films on Al2O3 (0001) substrates using pulsed laser deposition. Controlling the oxidation states of the three transition metals in NMC films is crucial for stable battery operation. However, in general, it is very difficult to simultaneously control the oxidation states of three elements in vacuum deposition processes. Tuning the oxygen partial pressure and temperature during deposition led to the growth of NMC thin films with ideal oxidation states (Ni2+, Mn4+, and Co3+), as confirmed using bulk-sensitive x-ray excited optical luminescence. Next, using the NMC epitaxial thin films, we prepared solid-state batteries that demonstrated stable operation and very low resistance at the solid electrolyte/electrode interfaces. These results provide insight into the fabrication of multi-transition-metal electrode thin film materials, which are important for investigating the mechanisms of lithium battery operation. Furthermore, the low interface resistance indicates that Li3PO4 and oxide electrode materials form very stable low-resistance interfaces.
AB - We report the low resistance observed at the interface of LiNi1/3Mn1/3Co1/3O2 (NMC) and Li3PO4. First, we show the deposition of high-quality single-phase NMC (001) epitaxial thin films on Al2O3 (0001) substrates using pulsed laser deposition. Controlling the oxidation states of the three transition metals in NMC films is crucial for stable battery operation. However, in general, it is very difficult to simultaneously control the oxidation states of three elements in vacuum deposition processes. Tuning the oxygen partial pressure and temperature during deposition led to the growth of NMC thin films with ideal oxidation states (Ni2+, Mn4+, and Co3+), as confirmed using bulk-sensitive x-ray excited optical luminescence. Next, using the NMC epitaxial thin films, we prepared solid-state batteries that demonstrated stable operation and very low resistance at the solid electrolyte/electrode interfaces. These results provide insight into the fabrication of multi-transition-metal electrode thin film materials, which are important for investigating the mechanisms of lithium battery operation. Furthermore, the low interface resistance indicates that Li3PO4 and oxide electrode materials form very stable low-resistance interfaces.
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U2 - 10.1063/1.5133879
DO - 10.1063/1.5133879
M3 - Article
AN - SCOPUS:85079229235
VL - 116
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 5
M1 - 053901
ER -