Three-dimensional bilayer garnet solid electrolyte based high energy density lithium metal-sulfur batteries
Three-dimensional bilayer garnet solid electrolyte based high energy density lithium metal-sulfur batteries
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DOI：
10.1039/c7ee01004d
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发表时间：
2017-07-01
影响因子：
32.5
通讯作者：
Hu, Liangbing
中科院分区：
文献类型：
--
作者：
Fu, Kun (Kelvin);Gong, Yunhui;Hu, Liangbing
为了同时解决化学/物理短路和电极体积变化的挑战，我们展示了用于先进锂金属电池的三维（3D）双层石榴石固态电解质框架。致密层的厚度减小到几微米，并且仍然保持良好的机械稳定性，从而使得能够安全使用Li金属阳极。厚多孔层充当薄致密层的机械支撑，薄致密层充当高负载阴极材料的主体并提供连续离子传输的路径。结果表明，该电池的硫阴极总负载量可达7 mg·cm ~（-2）以上，电池的初始库仑效率和平均库仑效率分别为99.8%和99%。这种电解质框架代表了一种有前途的策略，通过过渡到全固态电池来彻底改变锂金属电池，并且可以扩展到其他阴极材料。
To simultaneously address the challenges of chemical/physical short circuits and electrode volume variation, we demonstrate a three-dimensional (3D) bilayer garnet solid-state electrolyte framework for advanced Li metal batteries. The dense layer is reduced in thickness to a few microns and still retains good mechanical stability, thereby enabling the safe use of Li metal anodes. The thick porous layer acts as a mechanical support for the thin dense layer which serves as a host for high loading of cathode materials and provides pathways for continuous ion transport. Results show that the integrated sulfur cathode loading can reach >7 mg cm(-2) while the proposed hybrid Li-S battery exhibits a high initial coulombic efficiency (>99.8%) and high average coulombic efficiency (>99%) during the subsequent cycles. This electrolyte framework represents a promising strategy to revolutionize Li-metal batteries by transitioning to all-solid-state batteries and can be extended to other cathode materials.