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Issue 93, 2014
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Influence of sintering additives on densification and Li+ conductivity of Al doped Li7La3Zr2O12 lithium garnet

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Abstract

Garnet-like structured solid electrolyte Li7La3Zr2O12 (LLZ) in the cubic phase has received unique attention due to its high total (bulk + grain-boundary) Li+ conductivity combined with good chemical stability against lithium metal and commercial electrodes. In addition to the stabilization of high Li+ conductive cubic phase, the dense microstructure related to grains and grain-boundaries is also a critical issue for the successful application of LLZ as solid electrolyte membrane in all-solid-state lithium and lithium–air batteries. In this work, preparation of high Li+ conductive 0.9 wt% Al doped cubic LLZ i.e. Li6.16Al0.28La3Zr2O12 (Al–LLZ) by modified sol–gel technique and the influence of sintering additives on the density and total (bulk + grain-boundary) Li+ conductivity of the Al–LLZ are investigated. The present work reveals that among the three chosen sintering additives Li3BO3, Li3PO4 and Li4SiO4, Li4SiO4 appears to be a better sintering additive for the enhancement of the total (bulk + grain-boundary) Li+ conductivity and density of Al–LLZ. Among the investigated samples, Al–LLZ with 1 wt% of Li4SiO4 added and sintered at 1200 °C exhibits maximized total (bulk + grain-boundary) Li+ conductivity of 6.1 × 10−4 S cm−1 at room temperature (33 °C) along with the maximized density of 4.86 g cm−3 (relative density of 96%).

Graphical abstract: Influence of sintering additives on densification and Li+ conductivity of Al doped Li7La3Zr2O12 lithium garnet

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Publication details

The article was received on 14 Aug 2014, accepted on 01 Oct 2014 and first published on 03 Oct 2014


Article type: Paper
DOI: 10.1039/C4RA08674K
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Citation: RSC Adv., 2014,4, 51228-51238
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    Influence of sintering additives on densification and Li+ conductivity of Al doped Li7La3Zr2O12 lithium garnet

    N. Janani, C. Deviannapoorani, L. Dhivya and R. Murugan, RSC Adv., 2014, 4, 51228
    DOI: 10.1039/C4RA08674K

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