多硫化物
分离器(采油)
化学工程
吸附
化学
储能
催化作用
电化学
锂硫电池
材料科学
无机化学
电解质
电极
有机化学
物理化学
功率(物理)
物理
量子力学
工程类
热力学
作者
Xingfa Chen,Tianqi Yu,Renshu Huang,Xidong Liang,Huyi Yu,Lina Yang,Fan Wang,Shibin Yin
标识
DOI:10.1016/j.jallcom.2024.173482
摘要
Lithium−sulfur (Li−S) batteries are ideal energy storage devices due to their high energy density (2600 Wh kg−1), but polysulfide shuttling and lithium dendrite growth seriously preclude their practical application. Herein, a multifunctional layer composed of MnO, MnWO4 and carbon black is constructed to modify the polypropylene separator (MnO-MnWO4/CB@PP) of Li−S batteries. The MnO-MnWO4/CB layer possesses the ability to adsorb polysulfides through physical and chemical adsorption mechanisms, as well as catalyze their conversion. Results show that the adsorption-catalysis characteristic of MnO-MnWO4/CB enhances the capture capability for polysulfides to suppress its shuttling. Moreover, it acts as a buffer layer, facilitating the parallel electrodeposition of Li and inhibiting the growth of Li dendrite. As a result, the Li/Li symmetrical cell with MnO-MnWO4/CB@PP enables durable Li plating/stripping over 8000 h at 1.0 mA cm−2 with a capacity of 1.0 mAh cm−2. In addition, the Li−S battery with this modified separator demonstrates a competitive initial capacity of 1527.7 mAh g−1 at 0.2 C and a capacity retention of 80.8% after 1000 cycles at 2.0 C. This work presents an effective and straightforward approach for designing separator of Li−S battery.
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