【摘要】 选取Super-P(SP)、KB或MWCNTs导电碳膜夹层,并置于硫电极与隔膜间组装成扣式锂硫电池.相关评估结果表明,碳膜夹层可显著提高锂硫电池循环性能,硫电极(载硫量为80%,by mass,下同)循环40周后比容量均在800 mAh·g-1以上.上述三种碳膜的物理性质有较大差异,导致相应电池具有不同电性能.KB碳膜夹层电池呈现较强的电化学极化效应;SP碳膜夹层电池循环初期可释放出最高的比容量,而循环稳定性较差;MWCNTs碳膜可视为较适宜的导电碳夹层材料.更多还原

【Abstract】 Three kinds of conductive carbon films were prepared with Super-P(SP),KB and MWCNTs,and then the as-prepared carbon films were applied as an interlayer between a sulfur electrode and a separator for constructing a coin-type lithium-sulfur(Li-S) cell,respectively.The assessment results show that all the cells delivered the reversible capacities higher than 800 mAh·g-1after 40 cycles when the sulfur loading was up to 80%(by mass) in the sulfur electrode.Due to significant differences of physical properties among the carbon materials,the cell with a KB interlayer exhibited higher electrochemical polarization;the cycling performance of the cell with a SP interlayer was poorer than that of the other cells,although the discharge capacity was the highest in the initial cycles;MWCNTs film was the best choice as an interlayer in the Li-S cells.更多还原