Myeong Ju Lee, Ju Young Kim, Jimin Oh, Ju Mi Kim, Kwang Man Kim,
Young-Gi Lee, and Dong Ok Shin*이명주·김주영·오지민·김주미·김광만·이영기·신동옥*
Multidisciplinary Sensor Research Group, Electronics and Telecommunications Research Institute (ETRI),
218 Gajeong-ro, Yuseong-gu, Daejeon 34129, Republic of Korea한국전자통신연구원 융복합센서연구그룹
Safety issues in Li-ion battery system have been prime concerns, as demands for
power supply device applicable to wearable device, electrical vehicles and energy storage system
have increased. To solve safety problems, promising strategy is to replace organic liquid
electrolyte with non-flammable solid electrolyte, leading to the development of all-solid-state
battery. However, relative low conductivity and high resistance from rigid solid-solid interface
hinder a wide application of solid electrolyte. Composite electrolytes composed of organic and
inorganic parts could be alternative solution, which in turn bring about the increase of conductivity
and conformal contact at physically rough interfaces. In our study, composite electrolytes
were prepared by combining poly(ethylene oxide)(PEO) and Li7La3Zr2O12 (LLZO). The
crystallinity, morphology and electrochemical performances were investigated with the control
of LLZO contents from 0 wt% to 50 wt%. From the results, it is concluded that optimum
content and uniform dispersion of LLZO in polymer matrix are significant to improve overall
conductivity of composite electrolyte.
Keyword : Solid electrolyte, Composite, Lithium-ion battery, Poly(ethylene oxide), Li7La3Zr2O12