Electrochemical performance of a thermally rearranged polybenzoxazole nanocomposite membrane as a separator for lithium-ion batteries at elevated temperature

Title
Electrochemical performance of a thermally rearranged polybenzoxazole nanocomposite membrane as a separator for lithium-ion batteries at elevated temperature
Author
선양국
Keywords
Lithium-ion batteries; Composite membrane; Thermally rearranged polybenzoxazole; Re-precipitation method
Issue Date
2016-02
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 305, Page. 259-266
Abstract
Shape-tunable hydroxyl copolyimide (HPI) nanoparticles are fabricated by a re-precipitation method and are coated onto electrospun HPI membranes, followed by heat treatment to prepare thermally rearranged polybenzoxazole (TR-PBO) composite membranes. The morphology of HPI nanoparticles consisted of sphere and sea-squirt structures, which is controlled by changing the concentration of the stabilizer. The morphological characteristics of TR-PBO nanoparticles convert from HPI nanoparticles by heat treatment and their composite membranes is confirmed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), infrared spectroscopy (ATR-IR), thermogravimetric analysis (TGA) analysis, and contact angle measurements. TGA and DSC measurements confirm the excellent thermal stability compared to Celgard, a commercial PP separator for lithium-ion batteries (LIBs). Further, TR-PBO nano-composite membranes used in coin-cell type LIBs as a separator show excellent high power density performance as compared to Celgard. This is due to the fact that sea -squirt structured nano particles have better electrochemical properties than sphere structured nanoparticles at high temperature. (C) 2015 Published by Elsevier B.V.
URI
http://www.sciencedirect.com/science/article/pii/S0378775315305681?via%3Dihubhttp://hdl.handle.net/20.500.11754/33868
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2015.11.068
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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