Composite Electrolyte for All-Solid-State Lithium Batteries: Low-Temperature Fabrication and Conductivity Enhancement.
All-solid-state lithium batteries offer notable advantages over conventional Li-ion batteries with liquid electrolytes in terms of energy density, stability, and safety. To realize this technology, it is critical to develop highly reliable solid-state inorganic electrolytes with high ionic conductivities and adequate processability. Li1+xAlxTi2-x(PO4)3(LATP) with a NASICON (Na superionic conductor)-like structure is regarded as a potential solid electrolyte, owing to its high "bulk" conductivity (ca. 10-3S cm-1) and excellent stability against air and moisture. However, the solid LATP electrolyte still suffers from a low "total" conductivity, mainly owing to the blocking effect of grain boundaries to Li+conduction. In this study, an LATP-Bi2O3composite solid electrolyte shows very high total conductivity (9.4×10-4S cm-1) at room temperature. Bi2O3acts as a microstructural modifier to effectively reduce the fabrication temperature of the electrolyte and to enhance its ionic conductivity. Bi2O3promotes the densification of the LATP electrolyte, thereby improving its structural integrity, and at the same time, it facilitates Li+conduction, leading to reduced grain-boundary resistance. The feasibility of the LATP-Bi2O3composite electrolyte in all-solid-state Li batteries is also examined in this study.
New and Renewable Energy Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea.|Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.
Sang-Don
SD
Lee
New and Renewable Energy Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea.
Kyu-Nam
KN
Jung
Advanced Batteries Research Center, Korea Electronics Technology Institute, 25 Saenari-ro, Bundang-gu, Seongnam, 13509, Republic of Korea.
Hyeongil
H
Kim
New and Renewable Energy Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea.
Hyun-Seop
HS
Shin
Department of Fine Chemical Engineering and Applied Chemistry, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea.
Seung-Wan
SW
Song
Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin, 17104, Republic of Korea.
Min-Sik
MS
Park
New and Renewable Energy Research Division, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon, 34129, Republic of Korea.|Department of Advanced Energy and Technology, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea.
Jong-Won
JW
Lee
D011211:Electric Power Supplies; D004573:Electrolytes / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D056951:Photoelectron Spectroscopy; D014961:X-Ray Diffraction
D004573:Electrolytes; D008094:Lithium
bismuth oxide; grain-boundary resistance; ionic conductivity; lithium batteries; solid electrolyte