Статья

Single-Atom Coated Separator for Robust Lithium–Sulfur Batteries

Kun ZhangState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi’an 710072, ChinaZhongxin ChenDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeRuiqi NingState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi’an 710072, ChinaShibo XiAgency for Science, Technology and Research (A*STAR), Institute of Chemical and Engineering Sciences, 1 Pesek Road, Singapore 627833, Jurong Island, SingaporeWei TangSchool of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an, Shaan Xi 710049, P. R. ChinaYonghua DuAgency for Science, Technology and Research (A*STAR), Institute of Chemical and Engineering Sciences, 1 Pesek Road, Singapore 627833, Jurong Island, SingaporeCuibo LiuDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeZengying RenState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi’an 710072, ChinaXiao ChiUniversité Bourgogne Franche-ComtéMaohui BaiState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi’an 710072, ChinaChao ShenState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi’an 710072, ChinaXing LiDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeXiaowei WangDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeXiaoxu ZhaoDepartment of Materials Science and Engineering, National University of Singapore, Singapore 117575Kai LengDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeStephen J. PennycookDepartment of Materials Science and Engineering, National University of Singapore, Singapore 117575Hongping LiInstitute for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. ChinaHui XuInstitute for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. ChinaKian Ping LohDepartment of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, SingaporeKeyu XieState Key Laboratory of Solidification Processing, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi’an 710072, China

2019en

ABI

Аннотация

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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Идентификаторы

DOI: 10.1021/acsami.9b05628

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar · Скоро