Nag, Sourav and Pramanik, Atin and Roy, Shyamal and Mahanty, Sourindra (2022) Enhancement of Li+ ion kinetics in boehmite nanofiber coated polypropylene separator in LiFePO4 cells. Journal of Solid State Chemistry, 312. Art No-123214. ISSN 0022-4596

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Boehmite (gamma-AlO(OH)) nanofibers (length 90-140 nm; dia. -15 nm) synthesized by low temperature (180 degrees C) hydrothermal method and coated onto both sides of surface modified polypropylene. Ceramic coated composite separator (ALO-PP) shows enhanced thermal and dimensional stability over uncoated polypropylene (PP). Optimum coating thickness is found to be 8 mu m in each side. Electrochemical properties are investigated by assembling 2032-type coin cells using LiFePO4 as cathode against Li/Li+ in half-cell and Mesocarbon microbeads (MCMB) in full-cell configuration respectively. It is found that composite separator results in improved cell kinetics due to better electrolyte uptake and formation of a Li+ ions buffer reservoir facilitating fast ion transport at high current rates. About 16% higher capacity is observed for ALO-PP over PP at a current rate of C/5. Present results show that nanostructured boehmite could be a promising coating material for surface modification of polyolefin separators not only with improved safety but also with enhanced rate performance.

Item Type: Article
Subjects: Electronics
Depositing User: Bidhan Chaudhuri
Date Deposited: 15 Sep 2023 07:37
Last Modified: 15 Sep 2023 07:37

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