羧甲基纤维素钠取代度对蒽醌正极的影响

摘要

采用淤浆法制备水溶性粘结剂羧甲基纤维素钠(CMC),并进行红外光谱(FT-IR)、核磁氢谱(1H-NMR)和SEM分析.对蒽醌(AQ)正极进行了恒流充放电、循环伏安和交流阻抗等测试.以CMC为粘结剂的AQ电极,比容量和循环性能均比以PVDF为粘结剂的更高.以0.2 mA/cm2的电流密度在1.5～3.5 V循环,以高取代度(DS=1.23)的CMC-1为粘结剂的AQ/CMC-1电极首次和第50次循环的放电比容量分别为226.4 mAh/g和70.9 mAh/g.高取代度的CMC-1的电化学性能好于低取代度(DS=0.86)的CMC-2.%Water-soluble binder carboxymethyl cellulose sodium(CMC) was synthesized by slurry process. The Fourier transform infrared(FT-IR),nuclear magnetic resonance(1H-NMR)and SEM analyses were taken.The 9,10-anthraquinone( AQ)electrodes was tested by galvanostatic discharge-charge,cyclic voltammetry and electrochemical impedance spectroscopy. The specific capacity and cycle performance of electrode using CMC as binder was higher than the one using PVDF. When cycled with the current density of 0.2 mA/cm2 in 1.5～3.5 V,the specific discharge capacity of AQ/CMC-1 electrode which was prepared with the binder CMC-1 which had high degree of substitution(DS= 1.23)in the initial and 50th cycle was 226.4 mAh/g and 70.9 mAh/g, respectively. The electrochemical performance of CMC-1, which had a higher DS was superior to CMC-2 with a lower DS(DS= 0.86).