Preparation and performance of hierarchically porous carbons as oxygen electrodes for lithium oxygen batteries  

锂空气电池空气电极层次多孔碳的制备及其性能(英文)

作　　者：宋云峰[1] 王先友[1] 白艳松[1] 王灏[1] 胡本安[1] 舒洪波[1] 杨秀康[1] 易兰花[1] 鞠博伟[1] 张小艳[1] 

机构地区：[1]湘潭大学化学学院,环境友好化学与应用教育部重点实验室,湘潭411105

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第12期3685-3690,共6页中国有色金属学报（英文版）

基　　金：Projects (51272221,51072173,21203161) supported by the National Natural Science Foundation of China;Project (10CY005) supported by Industrial Project of Colleges and Universities of Hunan Province,China

摘　　要：The hierarchically porous carbons （HPCs） were prepared by sol-gel selassembly technology in different surfactant concentrations and were used as the potential electrode for lithium oxygen batteries. The physical and electrochemical properties of the as-prepared HPCs were investigated by filed emission scanning electron microscopy （FE-SEM）, transmission electron microscopy （TEM）, nitrogen adsorption-desorption isotherm and galvanostatic charge/discharge. The results indicate that all of the HPCs mainly possess mesoporous structure with nearly similar pore size distribution. Using the HPCs as the electrode, a high discharge capacity for lithium oxygen battery can be achieved, and the discharge capacity increases with the specific surface area. Especially, the HPCs-3 oxygen electrode with CTAB concentration of 0.27 mol/L exhibits good capacity retention through controlling discharge depth to 800 mA·h/g and the highest discharge capacity of 2050 mA·h/g at a rate of 0.1 mA/cm2.在不同表面活性剂浓度下通过溶胶凝胶自组装方法制备了具有介孔结构的层次多孔碳材料(HPCs)。用场发射扫描电镜(FE-SEM)、透射电镜(TEM)、氮气吸脱附测试和恒流充放电测试对样品进行物理和电化学性能研究。结果表明:所有的HPCs主要为介孔结构并且具有相似的孔径分布。以HPCs为空气电极载体碳材料的锂空气电池具有较高的放电容量。且相似孔径大小的碳材料为载体的锂空气电池放电容量随着碳材料的比表面积增加而增加。在c(CTAB)=0.27 mol/L时制备的HPCs-3样品具有最佳的电化学性能。通过控制放电深度至800 mA·h/g,电池表现出良好的容量保持率,在0.1 mA/cm2电流密度下,首次放电容量为2050 mA·h/g。

关 键 词：lithium oxygen battery hierarchically porous carbon oxygen electrode oxygen reduction 

分 类 号：TM912[电气工程—电力电子与电力传动]