Bai Xiaoming, Zhao Guangyu, Yang Guiye, Wang Ming, Chen Zhaoyu, Zhang Naiqing
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China.
Space Environment Simulation Research Infrastructure, Harbin Institute of Technology, Harbin 150006, People's Republic of China.
Nano Lett. 2023 Sep 13;23(17):7934-7940. doi: 10.1021/acs.nanolett.3c01731. Epub 2023 Aug 25.
Garnet-based solid-state electrolytes are considered crucial candidates for solid-state Li batteries due to their high Li conductivity and nonflammability; however, poor interfacial contact with the Li anode and growth of Li dendrites limit their application. Herein, a high-activity titanium-oxygen cluster is used as a brazing filler to braze the LiLaZrTaO (LLZTO) with an Li anode into the whole unit. The brazing layer leads to a significantly lower interfacial impedance of 8.32 Ω cm. Furthermore, the brazing layer is an isotropic amorphous ion-electron hybrid conductive layer, which significantly promotes Li transport and regulates the distribution of the electric field, therefore inhibiting the growth of Li dendrites. The cell exhibits an ultrahigh critical current density of 2.3 mA cm and stable cycling of over 4000 h at 0.5 mA cm (25 °C).
基于石榴石的固态电解质因其高锂离子电导率和不可燃性，被认为是固态锂电池的关键候选材料；然而，与锂负极的界面接触不良以及锂枝晶的生长限制了它们的应用。在此，一种高活性钛氧簇被用作钎料，将锂镧锆钽氧化物（LLZTO）与锂负极钎焊成一个整体单元。钎焊层导致界面阻抗显著降低，仅为8.32Ω·cm。此外，钎焊层是一个各向同性的非晶态离子 - 电子混合导电层，它显著促进了锂离子传输并调节了电场分布，从而抑制了锂枝晶的生长。该电池在0.5 mA/cm²（25℃）下表现出2.3 mA/cm²的超高临界电流密度和超过4000小时的稳定循环。
