以过期废药氨茶碱为碳源的氮掺杂碳负极的电化学储锂性能

通过高温热解碳化将过期废药氨茶碱以氮掺杂碳的形式进行回收;利用扫描电子显微镜(SEM)、X射线能量色散光谱仪(EDX)及X射线光电子能谱(XPS)研究了其微观形貌与组成,并进一步利用恒流充/放电、循环伏安法(CV)及交流阻抗法(AC)测试其电化学储锂性能。令人满意的是,伴随着过期药品氨茶碱的碳化,其中的氮元素以原位掺杂的形式保留在碳材料中,所制备的碳电极在25 m A·g-1循环200圈时的可逆比容量仍能达到520. 9m Ah·g-1;尤其是在大电流密度1 A·g-1循环200圈和2 A·g-1循环500圈时的可逆比容量仍分别稳定在203. 5m Ah·g-1与84. 8 m Ah·g-1,表现出了良好的可逆电化学储锂性能。

Electrochemical Li-storage Performances of N-doped Carbon Anode from the Expired Waste Medicine Aminophylline

The expired waste medicine aminophylline was recycled in the form of N-doped carbon anode material via one step facile carbonization.The microstructure and chemical component of N-doped carbon were characterized by scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDX)and X-ray photoelectron spectroscopy(XPS).Furthermore,the electrochemical Li-storage performances of N-doped carbon anode were investigated by galvanostatic charge/discharge,cyclic voltammetry(CV)and alternative current(AC)impedance.To be satisfactory,N element could be kept in the form of in situ N-doping within the carbon matrix during the carbonization of the expired waste medicine aminophylline.N-doped carbon anode delivered the reversible specific capacity of 520.9 mAh·g^-1 at 25 mA·g^-1 for 200 cycles;especially,even cycling at high current densities of 1 A·g^-1 for 200 cycles and 2 A·g^-1 for 500 cycles,the reversible specific capacity remained 203.5 mAh·g^-1 and 84.8 mAh·g^-1,respectively,implying high Li-storage performance of N-doped carbon anode.