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Al2O3辅助烧结LLZO基固体电解质的制备与表征
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Abstract:
锂离子电池市场的快速增长，使得人们对于锂离子电池性能和稳定性的要求变得更高。传统的液态有机电池容易短路引发爆炸和火灾，存在严重的安全隐患。与使用液态电解质的传统锂离子电池相比，全固态锂离子电池具有很好的稳定性和安全性，因而受到了广泛的关注。石榴石型固体电解质Li7La3Zr2O12(LLZO)具有较高的离子电导率，被认为是一种很有前景的固体电解质。然而，LLZO的合成往往需要较高的温度，但高温又会导致锂大量挥发，从而使得样品的离子电导率下降。因此，如何降低LLZO的合成温度和提高其电导率是一个重要的课题。本文中，我们通过引入Al2O3作为烧结助剂，利用传统的固相法合成了具有石榴石型结构的固体电解质Li6.1Ga0.3La3Zr2O12。与未引入Al2O3的样品相比，在引入Al2O3后，不仅降低了烧结温度，而且显著提高了离子电导率。我们发现添加少量的Al2O3作为助烧剂可以将烧结温度从1100℃降低到1050℃左右。最后，当Al2O3含量为2 wt%时，室温离子电导率最高，为1.28 mS/cm。
The rapid growth of the lithium-ion battery market has led to higher requirements for the performance and stability of lithium-ion batteries. Traditional liquid organic batteries are prone to short-circuits and cause explosions and fires, posing serious safety hazards. Compared with traditional Li-ion batteries using liquid electrolytes, all-solid-state Li-ion batteries have received extensive attention due to their good stability and safety. Garnet-type solid electrolyte Li7La3Zr2O12 (LLZO) has high ionic conductivity and is considered to be a promising solid electrolyte. However, the synthesis of LLZO often requires high temperature, but the high temperature could lead to a large amount of lithium evaporation, thus reducing the ionic conductivity of the LLZO-based samples. Therefore, how to reduce the synthesis temperature of LLZO and improve its ionic conductivity is an important topic. Here, we synthesized solid electrolytic Li6.1Ga0.3La3Zr2O12 with garnet-type structure by traditional solid-phase method and introducing Al2O3 as a sintering aid. Compared with the samples without sintering aid, the introduction of Al2O3 not only reduces the sintering temperature, but also significantly increases the ionic conductivity. It is found that adding a small amount of Al2O3 as an additive can reduce the sintering temperature from 1100°C to around 1050？C. Finally, we found, when the Al2O3 content is 2 wt%, the room-temperature ionic conductivity is the highest at 1.28 mS/cm.
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