Synthesis of an Al2O3-coated polyimide nanofiber mat and its electrochemical characteristics as a separator for lithium ion batteries

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Polyimide (PI) nanofibers with an average diameter of 300 nm, possessing superior electrolyte wettability and thermal stability, are synthesized by electrospinning a poly(amic acid) (PAA) solution followed by an imidization process. The large pore volume of the PI nanofiber mat can facilitate faster Li+-ion transport and greater rate capability, but it also cause an irreversible increase in cell impedance during long term cycling. To overcome these problems, thin Al2O3 over-layers are coated on both sides of a PI separator via a dip-coating process. The Al2O3-coated PI separators exhibit enhanced capacity, cyclability (95.53% retention after 200 cycles at 1 C), and rate capabilities (78.91% at 10 C) compared to the bare PI separator (68.65% at 10 C) and a commercial polypropylene separator (18.25% at 10 C) with a limited increase of cell impedance. (C) 2013 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2014-02
Language
English
Article Type
Article
Keywords

FIBROUS POLYMER ELECTROLYTES; CERAMIC-COATED SEPARATORS; COMPOSITE SEPARATORS; CYCLING PERFORMANCE; THERMAL-STABILITY; CATHODE MATERIALS; NONWOVEN; MEMBRANE; NANOPARTICLES; PVDF

Citation

JOURNAL OF POWER SOURCES, v.248, pp.1211 - 1217

ISSN
0378-7753
DOI
10.1016/j.jpowsour.2013.10.056
URI
http://hdl.handle.net/10203/189946
Appears in Collection
MS-Journal Papers(저널논문)
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