多硫化物
分离器(采油)
材料科学
电解质
硫黄
电极
锂硫电池
化学工程
电池(电)
储能
化学
冶金
物理化学
功率(物理)
工程类
物理
热力学
量子力学
作者
Kun Zhang,Zhongxin Chen,Ruiqi Ning,Shibo Xi,Wei Tang,Yonghua Du,Cuibo Liu,Zengying Ren,Xiao Chi,Maohui Bai,Chao Shen,Xing Li,Xiaowei Wang,Xiaoxu Zhao,Kai Leng,Stephen J. Pennycook,Hongping Li,Hui Xu,Kian Ping Loh,Keyu Xie
标识
DOI:10.1021/acsami.9b05628
摘要
Lithium-sulfur (Li-S) batteries are strong contenders among lithium batteries due to superior capacity and energy density, but the polysulfide shuttling effect limits the cycle life and reduces energy efficiency due to a voltage gap between charge and discharge. Here, we demonstrate that graphene foam impregnated with single-atom catalysts (SACs) can be coated on a commercial polypropylene separator to catalyze polysulfide conversion, leading to a reduced voltage gap and a much improved cycle life. Also, among Fe/Co/Ni SACs, Fe SACs may be a better option to be used in Li-S systems. By deploying SACs in the battery separator, cycling stability improves hugely, especially considering relatively high sulfur loading and ultralow SAC contents. Even at a metal loading of ∼2 μg in the whole cell, an Fe SAC-modified separator delivers superior Li-S battery performance even at high sulfur loading (891.6 mAh g-1, 83.7% retention after 750 cycles at 0.5C). Our work further enriches and expands the application of SACs catalyzing polysulfide blocking and conversion and improving round trip efficiencies in batteries, without side effects such as electrolyte and electrode decomposition.
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