期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 50, 页码 60046-60053出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c19859
关键词
functional separator; shuttle effect; pi-pi interactions; phthalocyanine compound; Li-S batteries
资金
- China-Japanese Research Cooperative Program by the Ministry of Science and Technology of the People's Republic of China [2017YFE0127600]
- National Natural Science Foundation of China [51702247]
- Fundamental Research Funds for the Central Universities [WUT: 2020III023, 2020III050, 2021IVA123, 2021III009]
- Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City [520LH056]
- Sanya Science and Education Innovation Park of Wuhan University of Technology [2020KF0021]
An ultrathin and lightweight layer of Co phthalocyanine loaded graphene oxide fabricated on a polypropylene separator shows great potential in improving the cycling stability and specific capacity of lithium-sulfur batteries, by inhibiting the shuttle effect and facilitating the conversion of intermediate polysulfides.
Rechargeable lithium-sulfur (Li-S) batteries have aroused great attention due to their high energy density and low cost. However, Li-S batteries suffer from rapid capacity decay owing to the shuttle effect of the intermediate polysulfides. To tackle this issue, functional separators with the ability to absorb polysulfides play a vital role to block them from passing through the separator. Herein, an ultrathin and lightweight layer of graphene oxide (GO) loaded with Co phthalocyanine (CoPc) is fabricated on a polypropylene (PP) separator. The thickness of CoPc@GO is about 200 nm with a low areal mass of 22 mu g cm(-2). CoPc is uniformly dispersed on GO sheets through pi-pi interactions, which inhibits the shuttle effect and facilitates the conversion of the intermediate polysulfides. In consequence, the battery with a CoPc@GO-PP separator exhibits good cycling stability with a low-capacity decay rate of 0.076% per cycle at 1 C over 400 cycles and a high specific capacity of 919 mA h g(-1) after 250 cycles at 0.5 C.
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