A different zirconia precursor for Li7La3Zr2O12 synthesis

Rahmawati, Fitria, Musyarofah, Bilqies, Nugrahaningtyas, Khoirina D, Prasetyo, Anton, Suendo, Veinardi, Haeruddin, Herry, Handaka, Muhammad, F.A, Nilasari, Hanida and Nursukatmo, Hartoto (2021) A different zirconia precursor for Li7La3Zr2O12 synthesis. Journal of Materials Research and Technology, 15. pp. 2725-2734. ISSN 2238-7854

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Li7La3Zr2O12 (LLZO) is a promising solid electrolyte for all-solid-state lithium-ion batteries. Some studies on LLZO synthesis have been conducted without considering the crystal structure of ZrO2 as the main precursor. In this research, different-precursors have been used for LLZO synthesis which was a monoclinic ZrO2 powder (m-ZrO2) and tetragonal ZrO2 powder (t-ZrO2). The reaction was conducted at 950 �C 6 h and followed by sintering at 1000 �C 6 h under Argon gas flow. The result shows that LLZO made from m-ZrO2 (LLZO(A)) and t-ZrO2 (LLZO(B)) contains t-LLZO and c-LLZO which is surprisingly having a similar c/t ratio of 0.124e0.125. The LLZO(A) and LLZO(B) provide a silver blocking ionic conductivity of 1.245 x 10�6 Scm�1 and 1.647 x 10�6 Scm�1, respectively. In addition, LLZO(B) provides lower specific resistance than LLZO(A) in between LiCoO2 and meso-carbon microbeads (mcmb) electrodes. CV analysis of the symmetrical Li-LLZO(B)eLi cell shows an electrochemical potential of 3.3 V (vs Li/Liþ) oxidation and 3.4 V reduction (vs Li/Liþ). A time-based Galvanostatic chargeedischarge to Li-LLZO(B)eLi shows a capacity drop after the 1st 40 cycles from 0.0383C/cm2 into 0.0303C/cm2 during the 2nd 40 cycles, and it remains stable up to 120 cycles. It confirms the long-term electrochemical stability of LLZO(B) which was produced from t-ZrO2. The solid-state reaction method provides less expensive production and environmentally friendly by the absence of organic solvent.

Item Type: Journal Article
Keywords: Li7La3Zr2O12, Crystal structure, Precursor, Monoclinic ZrO2, Tetragonal ZrO2
Subjects: 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030206 Solid State Chemistry
Divisions: Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User: Dr Anton Prasetyo
Date Deposited: 18 Nov 2021 10:57


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