Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 102, Issue -, Pages 1-4Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2019.03.009
Keywords
Poly (3, 4-ethylenedioxythiophene); C-LiFePO4; Current collector coating; Chemical vapor deposition; Lithium ion batteries
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC) [326937-2013-RGPIN]
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Although often overlooked, current collectors play a significant role in the performance, safety, and stability of lithium batteries. Here we present a strategy to modify conventional Al current collectors using a conducting polymer, significantly decreasing contact resistance and improving battery performance. The oxidant Fe (III) p-toluenesulfonate is aerosolized onto an aluminum foil current collector, followed by polymerization of 3, 4-ethylenedioxythiophene (EDOT) by chemical vapor deposition (CVD). As such, this fabrication technique should scalable using roll-to-roll or similar fabrication methods. The coated foil was used as a cathode current collector in lithium batteries. The improvement of the current collector is determined by electrochemical test in coin cells with C-LiFePO4 (C-LFP) and lithium as active materials. At 15C discharge rate, the new composite C-LFP-PEDOT-Al electrode provides a similar to 30% increase in discharge capacity compared to the standard C-LFP-Al electrode. The new composite has a perfect stability over 50 cycles at a C/2.5 rate.
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