多硫化物
分离器(采油)
材料科学
化学工程
储能
涂层
纳米技术
电极
化学
量子力学
电解质
热力学
物理
工程类
物理化学
功率(物理)
作者
Xiaoyan Zhou,Xiaogang Li,Zhuo Li,Jialong Fu,Shuo Xu,Zhou Wang,Siwei Gui,Lu Wei,Hui Yang,J. Wu,Xin Guo
标识
DOI:10.1016/j.mtener.2022.100990
摘要
Lithium-sulfur (Li-S) batteries are of considerable interest for low-cost and high-density energy storage. However, the notorious polysulfide shuttling and the undesired Li dendrite growth impel the development of Li-S batteries. To simultaneously mitigate these problems, a thin (∼10 μm) separator is herein developed by coating α-LiAlO2@γ-Al2O3 (LAO) nanosheets on the dual sides of a commercial polyethylene (PE) separator. Owing to the high anion-anchoring capability and the polysulfide absorbing and catalytic effect of LAO, the LAO modified separator (LAOMS) not only suppresses the polysulfide shuttling, but also homogenizes Li+ flux and reduces concentration polarization. As a result, the Li-Li cell with LAOMS demonstrates an unprecedented stability over 2500 h when cycled at a high current density of 5 mA/cm2. In addition, the Li-S battery with LAOMS exhibits superior cycling lifespan with an ultra-low capacity decay of 0.037% per cycle over 1000 cycles even at 2 C, excellent rate performance, and superior anti-self-discharge capability. Our studies not only shed light on the rational design of functionalized separators for high-performance Li-S batteries, but also provide a thin separator with promising commercial perspective.
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