Synthesis of Al-Y doped-lithium lanthanum zirconate and the effect of cold isostatic pressure to its electrical properties

F. Rahmawati, Septia K Arifah, Y. Hidayat
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Abstract

This research aims to study the Al-Y dopant to Lithium Lanthanum Zirconate (LLZO) to the characteristics and electrical properties of the LLZO as solid electrolyte. The synthesis was conducted through solid state reaction with Al2O3 and Y2O3 as dopant precursors. X-ray diffraction analysis along with Le Bail refinement was done to understand their structure, and phase content inside. The result found that Al and Y doping increased the cubic phase from 49.58% to 84.91%. The Al-Y doped-LLZO (LLZAYO) powder was then treated by a various cold isostatic pressing, CIP of 0, 20, 30, and 40 MPa to understand the effect of cold isostatic pressure to the ionic conductivity and solid electrolyte performance of the material even without heat sintering treatment. The result found that the green pellet of LLZAYO) which was isostatically pressed by 40 MPa at room temperature provides (9.06 ±0.26) x10-6 Scm-1, about 8 times higher than the LLZO without doping, i.e., (1.25 ±0.01) x 10-6 Scm-1. All solid-state battery with the prepare LLZAYO CIP 40 as solid electrolyte shows reversible reaction of Li/Li+ redox accompanied with Al/Al3+ redox. The Al/Al3+ reaction seems to decrease the electronic resistance between LCO-LLZAYO CIP40-Li which causes the full cell performance to decrease. The initial specific charging capacity is 82 mAh/g, and the initial discharge was 83 mAh/g, confirming 101 % of Coulombic efficiency. The discharge capacity drops to 46 mAh/g at second cycle, leading to a decrease in Coulombic efficiency to 56 %.
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Al-Y掺杂锆酸锂镧的合成及冷等静压对其电性能的影响
本研究旨在研究Al-Y掺杂到锆酸锂镧(LLZO)中对LLZO作为固体电解质的特性和电学性能的影响。以Al2O3和Y2O3为掺杂前驱体,通过固相反应进行合成。通过x射线衍射分析和勒拜耳精细化,了解了它们的结构和内部相含量。结果发现,Al和Y的掺杂使立方相由49.58%增加到84.91%。然后对Al-Y掺杂的llzo (LLZAYO)粉末进行不同的冷等静压处理,CIP为0、20、30和40 MPa,了解冷等静压对材料离子电导率和固体电解质性能的影响,即使不进行热烧结处理。结果表明,室温等静压40 MPa的绿色LLZAYO颗粒能提供(9.06±0.26)× 10-6 cm-1,是未掺杂LLZO的(1.25±0.01)× 10-6 cm-1的8倍左右。以制备的LLZAYO CIP 40为固体电解质的全固态电池表现出Li/Li+氧化还原伴随Al/Al3+氧化还原的可逆反应。Al/Al3+反应似乎降低了LCO-LLZAYO CIP40-Li之间的电子电阻,导致全电池性能下降。初始比充电容量为82 mAh/g,初始放电容量为83 mAh/g,库仑效率达到101%。第二次循环时,放电容量降至46 mAh/g,库仑效率降至56%。
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来源期刊
CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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