Abstracts Book - IMRC 2018

• SC1-O003
CHEMICAL PROCESSING AND MICROSTRUCTURE OF CATHODIC
THIN FILMS FOR ALL-SOLID-STATE-LITHIUM BATTERIES
Yumi Ikuhara 1 , Shunsuke Kobayashi 1 , Craig Fisher 1 , Akihide Kuwabara 1 , Hiroki Moriwake 1 ,
Yuichi Ikuhara 1,2
1 Japan Fine Ceramics Center, Nanostructures Research Laboratory, Japan. 2 The University of
Tokyo, Institute of Engineering Innovation, Japan.
Rechargeable Li-ion secondary batteries have been developed for use as
microbatteries in portable electronic devices for more than two decades. They
are also being developed for use in larger scale applications such as fully electric
vehicles and hybrid electric vehicles because of their high energy density and
high power density. Future application of all-solid-state lithium ion batteries
requires multilayer composite structure analysis of the cathode, electrolyte and
anode to understand the influence of microstructure on the battery
performance. In particular, cathode-substrate and cathode-electrolyte
interfaces are known to influence charge/discharge rates, cyclability, and battery
lifetime. Further, the crystal orientation and quality are affected by the
processing method and conditions, as well as the choice of orientation of
substrate. Chemical processing via a solution route using metalorganic
precursors is advantageous for preparing thin films with desired stoichiometry,
controlled purity, and compositional homogeneity. We systematically fabricated
the cathode thin films on various kinds of substrates by chemically solution
deposition (CSD) method and the oriented structure and the interface structure
of the films and substrates have been studied in detail 1,2,3) . In this study, LiMn2O4
thin films were grown on the various solid state electrolyte substrates by CSD
method, and the interface structures, crystal orientation between the film and
substrate were investigated using XRD, TEM and advanced transmission
electron microscopy including Cs-corrected STEM to understanding their effects
on the lithium interecalation-deintercalation behavior. In addition, the
mechanism of LiMn2O4 thin films growth on the solid state electrolyte will be
discussed by the transformation process via an [Li-Mn-O] metallo-organic
precursor solution.
[1]Y. H. Ikuhara, et al., J. Phys. Chem. C, 118, (2014) 19540–19547.
[2]X. Gao, et al., Adv. Mater. Interfaces, 1, (2014) 1400143.
[3]Y. H. Ikuhara, et al., J. Mater. Chem. A, 5, (2017) 9729-9738.
[4]Y. Fujiwara, et al., Jpn. J. Appl. Phys. 55, (2016) 090306.