Zhang Xinyue, Xiang Qian, Tang Shan, Wang Aoxuan, Liu Xingjiang, Luo Jiayan
Key Laboratory for Green Chemical Technology of Ministry of Education, State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.
State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116023, China.
Nano Lett. 2020 Apr 8;20(4):2871-2878. doi: 10.1021/acs.nanolett.0c00693. Epub 2020 Mar 23.
Inorganic solid-state electrolyte (SSE) has offered a promising option for the safe rechargeable Li metal batteries. However, the solid-solid interfacial incompatibility greatly hampers the practical use. The interface becomes even worse during repeated Li plating/stripping, especially under high current density and long cycling operation. To promise an intimate contact and uniform Li deposition during cycling, we herein demonstrate a stress self-adapted Li/Garnet interface by integrating Li foil with a hyperelastic substrate. Consecutive and conformal physical contact was ensured at Li/Garnet interface during Li plating/stripping, therefore dissipating the localized stress, suppressing Li dendrite formation, and preventing Garnet cracks. Record long cycling life over 5000 cycles was achieved with the ultrasmall hysteresis of 55 mV at high current density of 0.2 mA cm. Our strategy provides a new way to stabilize Li/Garnet interface from the perspective of anode mechanical regulation and paves the way for the next generation solid-state Li metal batteries.
无机固态电解质（SSE）为安全的可充电锂金属电池提供了一个有前景的选择。然而，固-固界面不相容性极大地阻碍了其实际应用。在反复的锂电镀/剥离过程中，尤其是在高电流密度和长循环操作下，界面会变得更糟。为了在循环过程中保证紧密接触和均匀的锂沉积，我们在此展示了一种通过将锂箔与超弹性基底集成来实现应力自适应的锂/石榴石界面。在锂电镀/剥离过程中，锂/石榴石界面确保了连续且共形的物理接触，从而消散局部应力，抑制锂枝晶形成，并防止石榴石开裂。在0.2 mA cm的高电流密度下，实现了超过5000次循环的创纪录长循环寿命，滞后电压仅为55 mV。我们的策略从阳极机械调控的角度为稳定锂/石榴石界面提供了一种新方法，为下一代固态锂金属电池铺平了道路。
