有机自由基聚合物PTMA电极的研究与制备

Research and preparation of organic radical polymer PTMA electrode

利用具有高电导率和高比表面积的碳黑Black Pearl-2000(BP)研制了聚(2,2,6,6-四甲基哌啶-4-甲基丙烯酸酯-1-氮氧自由基)(PTMA)电极(PTMA-BP电极),并研究了PTMA的含量和电极的厚度对PTMA-BP电极电化学性能的影响。结果表明,厚度为20μm,PTMA含量22.5%的PTMA-BP电极具有最高的比容量(151 mAh/g)和最优的循环稳定性,500次充放电循环后的容量保持率大于88%;并且倍率性能优异,以50 C放电,电极的比容量为130mAh/g。提高PTMA的含量和增加电极的厚度,均加大电极极化。因此,提高PTMA在电极中的分布均匀性,增大实际反应面积,以及制备具有较薄结构的电极是研制PTMA电极的关键。

Black Pearl-2000 （BP） carbon black with high conductivity and large specific surface area was employed to prepare poly（4-methacryloyloxy-2,2,6,6-tetramethyl-piperidine-N-oxyl） （PTMA） electrodes. The influences of the PTMA content and the electrode thickness on the electrochemical properties of PTMA-BP electrodes were investigated. It is found that the PTMA-BP electrode of 20 μm in thickness containing 22.5% PTMA presents a large specific capacity of 151 mAh/g and good cycling property. The capacity retention of the electrode after 500 charge-discharge cycles is larger than 88%. Besides, the rate capability of the electrode is also good, at a discharge rate of 50 C, the specific capacity of the electrode is 130 mAh/g. The polarization of the PTMA-BP electrode is enhanced with the increasing of PTMA content and the electrode thickness. It is indicated that the homogeneous distribution of PTMA in the electrode with a thin structure is the key factor for developing the PTMA-electrode.