期刊
SOLID STATE IONICS
卷 178, 期 27-28, 页码 1546-1551出版社
ELSEVIER
DOI: 10.1016/j.ssi.2007.09.009
关键词
organic radical battery; cathode materials; lithium secondary batteries; PTMA; electrochemical property
资金
- National Research Foundation of Korea [핵C6B1307] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The influence of cathode thickness on the electrochemical performance of an organic radical battery (ORB) with the radical polymer poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl methacrylate) (PTMA) as the cathode active material is presented. The ORB consists of lithium metal anode and PTMA cathode with an active material content of 40 wt.%. An increase in cathode thickness results in a decrease in specific capacity and discharge voltage of the cell and an increase in electrode/electrolyte interfacial resistance. The best performance is achieved with a thin cathode of 17 mu m that shows nearly 100% utilization of the active material(similar to 111 mAh/g) at current densities up to 1.0 mA/cm(2). The cell exhibits excellent high-rate capability and cycle characteristics with a stable impedance behavior and an intact cathode structure on cycling. The results demonstrate that high performance can be achieved from the non-conductive PTMA cathode with higher active material content by using a thin and properly prepared cathode consisting of a uniform, nanometer range coating of the polymer layer on the conductive carbon particles. (C) 2007 Elsevier B.V. All rights reserved.
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