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윤영섭,김정훈,박찬휘,신동욱 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.4
Lithium ion conducting NASICON-type electrolytes of general formula Li1.3Al0.3Ti1.7(PO4)3 (LATP) are fabricated by a citric acid-supported sol-gel process and analyzed for thermal stability, microstructure, crystalline phases. From these structural analyses, the relationship of microstructural changes and electrochemical properties is investigated. It is demonstrated that the sol-gel method enable to obtain pure LATP crystals at a lower temperature in a shorter synthesis time compared to conventional solid state reaction or glass-ceramics processes. The dense electrolyte pellets are prepared from the LATP nanopowders by sintering at 900 o C for 3 hours, and a room temperature conductivity of 7.8 × 10-5S/cm and activation energy of 38.2 KJ/mol was obtained.
You Li,Mulan Tang,Shuxin Xu,Shuchao Zhang,Yuxin Zhai,Jiarong Yin,Zhengguang Zou 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
The NASICON-type solid electrolyte structure of Li1.3Al0.3Ti1.7(PO4)3 (LATP) exhibits good electrochemicalperformance and thermal stability, and has been promising as a solid electrolyte. Here, a stable goodstabilityLATP precursor spinning solution was prepared using the sol–gel method for the first time. A linearLATP solid electrolyte with an oriented ordered structure was obtained using improved electrostaticspinning equipment. The sintering process regime of the LATP-ordered construction was determined. Theionic conductivity of the prepared LATP-PEO/LiClO4-PEG composite solid-state electrolyte with anordered structure was as high as 2.05 10-4 Scm1 at room temperature (25 C), one order of magnitudehigher than the ionic conductivity of the LATP composite solid-state electrolyte reported so far. Organicsolid-state electrolytes to protect LATP-ordered structured solid-state electrolytes yield excellent electrochemicalstability in lithium-metal batteries.
Progressive Assessment on the Decomposition Reaction of Na Superionic Conducting Ceramics
Jung, Jae-Il,Kim, Daekyeom,Kim, Hyojin,Jo, Yong Nam,Park, Jung Sik,Kim, Youngsik American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.1
<P>The successful analysis on the microstructure of Hong type Na superionic conducting (NASICON) ceramics revealed that it consists of several heterogeneous phases: NASICON grains with rectangular shapes, monoclinic round ZrO2 particles, grain boundaries, a SiO2-rich vitrified phase, Na-rich amorphous particles, and pores. A dramatic microstructural evolution of NASICON ceramics was demonstrated via an in situ analysis, which showed that NASICON grains sequentially lost their original morphology and were transformed into comminuted particles (as indicated by the immersion of bulk NASICON samples into seawater at a temperature of 80 degrees C). The consecutive X-ray diffraction analysis represented that the significant shear stress inside NASICON ceramics caused their structural decomposition, during which H3O+ ions occupied ceramic Na+ sites (predominantly along the ((1) over bar 11) and ((1) over bar 33) planes), while the original Na+. cations came out in the (020) plane of the NASICON ceramic crystalline structure. The results of time-of-flight secondary-ion mass spectrometry analysis, confirmed that large concentrations of Cl- and Na+ ions were distributed across the surface of NASICON ceramics, leading to local densification of a 20 mu m thick surface layer after treatment within seawater solution at a temperature of 80 degrees C.</P>