Lan FuYin, Zhang HaiYan, Fan Jinchen, Xu Qunjie, Li Hexing, Min YuLin
Shanghai Key Laboratory of Materials Protection and Advanced Materials Electric Power, Shanghai Engineering Research Center of Energy-Saving in Heat Exchange Systems, Shanghai University of Electric Power, Shanghai 200090, P. R. China.
Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, P. R. China.
ACS Appl Mater Interfaces. 2021 Jan 20;13(2):2734-2744. doi: 10.1021/acsami.0c19909. Epub 2021 Jan 5.
Herein, we introduce polymer nanofibers of TiO@NiCo-LDH as interlayers into Li-S batteries. From 0 to 60 °C, the interlayers can deliver high sulfur utilization, an outstanding rate capability, and excellent cycling life. High-temperature excitation makes it easier for the valence band electrons of TiO to transition to the conduction band. The electron-hole pairs formed on the surface combine with the ether group of 1,3-dioxolane in the electrolyte, which greatly reduces the decomposition and volatilization rates of the electrolyte, ensuring Li-S batteries with good cycle performance at high temperatures. The capacity can stabilize at 798.6 mAh g after 100 cycles at 60 °C and 1C, and the battery can provide a capacity higher than 323.2 mAh g at 0 °C. Simultaneously, the lithium metal symmetrical battery with a functional separator can be continuously cycled for 1800 and 750 h without a short circuit at the current densities of 0.65 and 1.63 mA cm, respectively.
在此，我们将TiO@NiCo-LDH聚合物纳米纤维作为中间层引入锂硫电池。在0至60°C的温度范围内，这些中间层能够实现高硫利用率、出色的倍率性能和优异的循环寿命。高温激发使得TiO的价带电子更容易跃迁到导带。表面形成的电子-空穴对与电解质中1,3-二氧戊环的醚基团结合，这大大降低了电解质的分解和挥发速率，确保锂硫电池在高温下具有良好的循环性能。在60°C和1C的条件下循环100次后，容量可稳定在798.6 mAh g，并且该电池在0°C时可提供高于323.2 mAh g的容量。同时，具有功能隔膜的锂金属对称电池在电流密度分别为0.65和1.63 mA cm时，可分别连续循环1800小时和750小时而不发生短路。
