期刊
JOURNAL OF MEMBRANE SCIENCE
卷 549, 期 -, 页码 321-331出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2017.12.028
关键词
Polyimide; Nanofibers; Lithium-ion batteries; Flame retardancy; Separator
资金
- National Natural Science Foundation of China [51003033]
- Fundamental Research Funds for the Central Universities, SCUT [2015ZM100]
A robust fluorinated polyimide (FPI) nanofibers membrane was prepared by an electrospinning technique and subsequent thermo-crosslinking process. Compared to pristine FPI nanofibers membrane, the thermally crosslinked FPI nanofibers membrane possesses considerable mechanical strength (i.e., 31.7 MPa), small average pore size and narrow pore-size distribution and shows enhanced performance to prevent the growth and penetration of dendritic lithium, which is crucial to safe and reliable lithium-ion batteries. It is demonstrated that the FPI nanofibers membrane possesses admirable thermal stability and flame retardancy. The as-prepared pristine or thermally cross-linked FPI nanofibers membrane as a separator has greater electrolyte wettability, larger ionic conductivity, higher electrochemical oxidation limit, lower interfacial resistance, as compared to its non-fluorinated analogue nanofibers membrane and the commercial polyethylene (PE) separator. Moreover, compared with non-fluorinated PI analogue nanofibers membrane, the battery assembled with FPI nanofibers membrane with FPI binder exhibits enhanced cycle performance and rate capacity. And the electrochemical performances of the FPI-based battery are also better than the commercial battery fabricated by PE separator and polyvinylidene fluoride (PVDF) binder.
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