期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 28, 页码 25147-25154出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b05628
关键词
single-atom catalyst; lithium-sulfur battery; battery separator; in situ Raman measurement; polysulfide shuttling effect
资金
- National Research Foundation, Singapore [NRF-NRF 12015-01]
- National Natural Science Foundation of China [51674202]
- Outstanding Young Scholars of Shaanxi [2019JC-12]
- Fundamental Research Funds for the Central Universities [19GH020302]
- TOP International University Visiting Program for Outstanding Young Scholars of Northwestern Polytechnical University
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 similar to 2 mu g 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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