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首页> 外文期刊>Advanced energy materials >A Lithium Oxythioborosilicate Solid Electrolyte Glass with Superionic Conductivity
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A Lithium Oxythioborosilicate Solid Electrolyte Glass with Superionic Conductivity

机译：具有超离子电导率的乙氧基硫代硼硅酸锂固体电解质玻璃

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摘要

As potential next-generation energy storage devices, solid-state lithium batteries require highly functional solid state electrolytes. Recent research is primarily focused on crystalline materials, while amorphous materials offer advantages by eliminating problematic grain boundaries that can limit ion transport and trigger dendritic growth at the Li anode. However, simultaneously achieving high conductivity and stability in glasses is a challenge. New quaternary superionic lithium oxythioborate glasses are reported that exhibit high ion conductivity up to 2 mS cm(-1) despite relatively high oxygen: sulfur ratios of more than 1:2, that exhibit greatly reduced H2S evolution upon exposure to air compared to Li7P3S11. These monolithic glasses are prepared from vitreous melts without ball-milling and exhibit no discernable XRD pattern. Solid-state NMR studies elucidate the structural entities that comprise the local glass structure which dictates fast ion conduction. Stripping/plating onto lithium metal results in very low polarization at a current density of 0.1 mA cm(-2) over repeated cycling. Evaluation of the optimal glass composition as an electrolyte in an all-solid-state battery shows it exhibits excellent cycling stability and maintains near theoretical capacity for over 130 cycles at room temperature with Coulombic efficiency close to 99.9%, opening up new avenues of exploration for these quaternary compositions.
机译：作为潜在的下一代能量存储设备，固态锂电池需要功能强大的固态电解质。最近的研究主要集中在晶体材料上，而无定形材料则通过消除有问题的晶界提供优势，这些晶界可以限制离子迁移并触发Li阳极处的树枝状生长。然而，同时实现玻璃的高导电性和稳定性是一个挑战。据报道，尽管相对较高的氧：硫比超过1：2，但新型季铵离子硫代硼酸锂锂玻璃仍显示高达2 mS cm（-1）的高离子电导率，与Li7P3S11相比，暴露于空气中时H2S的释放大大降低。这些整体玻璃是由玻璃熔体制备的，没有进行球磨，并且没有明显的XRD图案。固态NMR研究阐明了构成局部玻璃结构的结构实体，该结构决定了快速的离子传导。剥离/电镀到锂金属上会导致在反复循环中，电流密度为0.1 mA cm（-2）时极化非常低。对在全固态电池中用作电解质的最佳玻璃成分的评估表明，它具有出色的循环稳定性，并且在室温下可进行130多个循环，并保持接近理论容量，库仑效率接近99.9％，从而开辟了新的探索途径这些四元组成。

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