Zhou Jinqiu, Qian Tao, Liu Jie, Wang Mengfan, Zhang Li, Yan Chenglin
Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province , Soochow University , Suzhou 215006 , China.
Nano Lett. 2019 May 8;19(5):3066-3073. doi: 10.1021/acs.nanolett.9b00450. Epub 2019 Apr 10.
Lithium-metal batteries (LMB) are very attractive owing to their high theoretical energy density, but significant challenges such as low ionic conductivity and safety risks prevent their widespread application. Herein, we report a new design of high-safety all-solid-state LMB by using high-ionic-conductivity thermoresponsive solid-polymer electrolyte (TSPE), providing a smart and active approach to realize thermally induced autonomic shutdown of LMBs by efficiently inhibiting the ionic conduction between electrodes beyond an unsafe temperature. The as-obtained TSPE exhibits a high ionic conductivity (2 × 10 S cm at 30 °C), which enables a significantly improved capacity of 160 mA h g at 0.2 C and outstanding high rate capability up to 5 C as well as a super-long cycle life of over 400 cycles for the constructed all-solid-state Li||LiFePO batteries. The present study opens up a new avenue for the fabrication of self-protective all-solid-state batteries with inherent intelligent thermal management to ensure battery-series safety.
锂金属电池（LMB）因其高理论能量密度而极具吸引力，但诸如低离子电导率和安全风险等重大挑战阻碍了它们的广泛应用。在此，我们报告了一种通过使用高离子传导性热响应固态聚合物电解质（TSPE）设计的高安全性全固态LMB，提供了一种智能且主动的方法，通过在超过不安全温度时有效抑制电极之间的离子传导来实现LMB的热诱导自主关闭。所制备的TSPE表现出高离子电导率（30°C时为2×10 S cm），这使得所构建的全固态Li||LiFePO电池在0.2 C时容量显著提高至160 mA h g，具有高达5 C的出色高倍率性能以及超过400次循环的超长循环寿命。本研究为制造具有固有智能热管理以确保电池组安全的自保护全固态电池开辟了一条新途径。
