Title
Bottom-current-collector-free thin-film batteries using LiNi0.8Co0.2O2 epitaxial thin films
Author
Kazunori Nishioa, Koji Horiba, Naoto Nakamura, Miho Kitamura, Hiroshi Kumigashira, Ryota Shimizu, Taro Hitosugi
Year
2019
Journal
Journal of Power Sources
Abstract
The decrease in the resistance at solid electrolyte and electrode interfaces has become a critical issue in the
development of solid-state lithium batteries. To understand the ionic transport properties across solid electrolyte
and electrode interfaces, thin-film batteries consisting of flat epitaxial films are of considerable importance.
Herein, we report the operation of bottom-current-collector-free thin-film batteries using LiNi0.8Co0.2O2 epitaxial
thin films. As the bottom current collector is not inserted between the substrates and LiNi0.8Co0.2O2, the surface
of LiNi0.8Co0.2O2 is very flat, with a surface roughness average of approximately 0.44 nm. This study proposes a
very flat electrode surface suitable for the investigation of interfacial phenomena at solid electrolyte and electrode
interfaces.
Instrument
NRS-4100
Keywords
Raman imaging microscopy, Solid-state battery, LiNi0.8Co0.2O2, Epitaxial thin film, Pulsed laser deposition, Interface resistance