Cheng Eric Jianfeng, Kimura Takeshi, Shoji Mao, Ueda Hiroshi, Munakata Hirokazu, Kanamura Kiyoshi
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minami-Osawa, Hachioji, Tokyo 192-0397, Japan.
3DOM Inc., 3-9 Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa 221-0022, Japan.
ACS Appl Mater Interfaces. 2020 Mar 4;12(9):10382-10388. doi: 10.1021/acsami.9b21251. Epub 2020 Feb 20.
The increasing demand for high-energy-density batteries stimulated the revival of research interest in Li-metal batteries. The garnet-type ceramic LiLaZrO (LLZO) is one of the few solid-state fast-ion conductors that are stable against Li metal. However, the densification of LLZO powders usually requires high sintering temperatures (e.g., 1200 °C), which likely result in Li loss and various side reactions. From an engineering point of view, high-temperature sintering of thin LLZO electrolytes (brittle) at a large scale is difficult. Moreover, the high interfacial resistance between the solid LLZO electrolytes and electrodes is a notorious problem. Here, we report a practical synthesis of a flexible composite Al-doped LLZO (Al-LLZO) sheet electrolyte (75 μm in thickness), which can be mass-produced at room temperature. This ceramic-based flexible sheet electrolyte enables Li-metal batteries to operate at both 60 and 30 °C, demonstrating its potential application for developing practical Li-metal batteries.
对高能量密度电池日益增长的需求刺激了锂金属电池研究兴趣的复苏。石榴石型陶瓷LiLaZrO（LLZO）是少数对锂金属稳定的固态快离子导体之一。然而，LLZO粉末的致密化通常需要较高的烧结温度（例如1200°C），这可能导致锂损失和各种副反应。从工程角度来看，大规模高温烧结薄的LLZO电解质（易碎）很困难。此外，固态LLZO电解质与电极之间的高界面电阻是一个众所周知的问题。在此，我们报道了一种实用的柔性复合铝掺杂LLZO（Al-LLZO）片状电解质（厚度为75μm）的合成方法，该电解质可在室温下大规模生产。这种基于陶瓷的柔性片状电解质使锂金属电池能够在60°C和30°C下运行，展示了其在开发实用锂金属电池方面的潜在应用。
