期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 582, 期 -, 页码 236-245出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.08.044
关键词
Metal organic frameworks; Fluorine doping; Reduced graphene oxide; Hollow urchins; Lithium and sodium storage
资金
- Natural Science Foundation of Henan Province [182300410278]
- National Natural Science Foundation of China [21373189]
The F-doped hollow urchin Co-MOF/rGO composite shows excellent reversibility, rate performance, and cyclic stability in LIBs, with high capacity retention in full cell configurations.
To obtain MOFs materials with good electrochemical performance in both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs), a kind of hollow urchins Co-MOF with doping fluorine (F) was in-situ assembled on reduced graphene oxide (rGO) using a simple solvothermal reaction. According to XRD, XPS and EDS mapping analysis, the molecular structure should be Co-2[F-x(OH)(1-x)](2)(C8O4H4) (denoted as F-Co-MOF). When the composite material is used as active material to assemble LIBs, it not only presents the outstand-ing reversible capacity (1202.0 mA h g(-1) at 0.1 Ag-1), but also gives the excellent rate performance and cycle performance (771.5 mA h g(-1) at 2 A g(-1) after 550 repeated cycles). The remarkable lithium storage capacity of F-Co-MOF/rGO is also reflected in the full cell, where it can still maintain a high capacity of 165.2 mA h g(-1) after 300 cycles at 0.2 A g(-1). It benefits from the synergistic effect of F-Co-MOF and high conductive rGO networks, so that the reversibility of lithium and sodium storage can be improved. This kind of F doped solvothermal synthesis of MOFs is of great significance for the exploration of high performance materials. (C) 2020 Elsevier Inc. All rights reserved.
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