ZnCl_2活化玉米秸秆炭化物的制备及其储锂性能研究

Preparation of Corn Straw Carbide by Activation with ZnCl_2 and Its Lithium-storage Performance

以玉米秸秆为原料,经高温煅烧制备了玉米秸秆炭化物(C1)和ZnCl_2活化玉米秸秆炭化物(C2)。利用扫描电子显微镜(SEM)、N2等温吸-脱附测试和恒电流充放电对材料进行结构、电化学性能分析。结果表明:C2具有较大的比表面积(425.06 m2·g^(-1))和丰富的孔道结构;电流密度为100 mA·g^(-1)时,C1和C2的首次放电和充电比容量分别为540.2 mAh·g^(-1),277.2 mAh·g^(-1)和1 156.0 mAh·g^(-1),517.6 mAh·g^(-1); 600 mA·g^(-1)电流密度下循环300次后,C2的放电比容量可保持在379.8 mAh·g^(-1),C2具有较高的可逆比容量和良好的循环稳定性。

The corn straw carbides（ C1, C2 ） were prepared by high temperature calcination and activation with ZnCl 2 , using corn straw as a raw material. The structure and electrochemical properties were characterized by scanning electron microscopy（SEM）, nitrogen adsorption/desorption and constant current charge/discharge method. The results showed that C2 has porous flaky structure owning a high surface area of 425.06 m 2 ·g -1 . At a current density of 100 mA·g -1 , the initial discharge and charge capacities of C1 are 540.2 mAh·g -1 and 277.2 mAh·g -1 , respectively, and those for C2 are 1 156.0 mAh·g -1 and 517.6 mAh·g -1 . After 300 cycles, C2 can maintain the discharge capacity of 379.8 mAh·g -1 at the current density of 600 mA·g -1 . C2 possesses higher reversible capacities and better cycling stability.