Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 14, Issue 3, Pages 371-376Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2007.12.002
Keywords
organic radical battery; PTMA; cathode material; lithium secondary batteries
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The nitroxide radical polymer, poly(2,216,6-tetramethylpiperidinyloxy-4-ylmethacrylate) (PTMA) is gaining increasing attention as a promising cathode-active material for high-rate capable, organic radical batteries (ORBs). This study evaluates the effect of varying PTMA content (20, 40 and 60 wt.%) on the cathode morphology and electrochemical properties of the ORB operating at room temperature with lithium metal anode and 1 M LiPF6 in ethylene carbonate (EC)/dimethyl carbonate (DMC) electrolyte. The cathodes with 20 and 40% of PTMA exhibited uniform particle morphology with a thin layer of polymer coating and these resulted in achieving 100% utilization of the active material (111 mAh/g specific capacity for the cell) at moderate Grates. The cathode with 60% of PTMA exhibited larger ohmic resistance and lower charge-discharge properties due to the thicker layer of insulating polymer. The maximum discharge capacities at very high C-rates of 30 and 50 C were realized from the 20% PTMA cathode that has the highest carbon content and hence the lowest ohmic resistance. The Li/PTMA cells exhibited good performance on long-term cycling at 1 C, irrespective of the PTMA content in the cathode. (C) 2008 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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