Journal
ACS NANO
Volume 14, Issue 6, Pages 7538-7551Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c03403
Keywords
Li-S battery; dual-regulation system; mediator; iron phthalocvanine; octafluoronaphthalene
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Funding
- National Natural Science Foundation of China [51972238, 21875166, 51920105004]
- Natural Science Foundation of Zhejiang Province [LR18E020001, LQ19B030006]
- General Research Foundation of Zhejiang Educational Committee [Y201839009]
- Science and Technology Project of Zhejiang Province [LGF18B050005]
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The sluggish reaction kinetics at the cathode/electrolyte interface of lithium-sulfur (Li-S) batteries limits their commercialization. Herein, we show that a dual-regulation system of iron phthalocyanine (FePc) and octafluoronaphthalene (OFN) decorated on Fe graphene (Gh), denoted as Gh/FePc+OFN, accelerates the interfacial ti reaction kinetics of lithium polysulfides (LiPSs). Multiple in situ spectroscopy techniques and ex situ X-ray photoelectron spectroscopy combined with density functional theory calculations demonstrate that FePc acts as an efficient anchor and scissor for the LiPSs through Fe...S coordination, mainly facilitating their liquid-liquid transformation, whereas OFN enables Li-bond interaction with the LiPSs, accelerating the kinetics of the liquid-solid nucleation and growth of Li2S. This dual-regulation system promotes the smooth conversion reaction of sulfur, thereby improving the battery performance. A Gh/FePc+OFN-based Li-S cathode delivered an ultrahigh initial capacity of 1604 mAh g(-1) at 0.2 C, with an ultralow capacity decay rate of 0.055% per cycle at 1 C over 1000 cycles.
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