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.
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-1 after 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.
[1] Su Y S, Manthiram A. A new approach to improve cycle performance of rechargeable lithium-sulfur batteries by inserting a free-standing MWCNT interlayer[J]. Chemical Communications, 2012, 48(70): 8817-8819.
[2] Su Y S, Manthiram A. Lithium-sulphur batteries with a microporous carbon paper as a bifunctional interlayer[J]. Nature Communications, 2012, 3: Article number 1166.
[3] Pognon G, Brousse T, Belanger D. Effect of molecular grafting on the pore size distribution and the double layer capacitance of activated carbon for electrochemical double layer capacitors[J]. Carbon, 2011, 49(4): 1340-1348.
[4] Kruk M, Jaroniec M. Gas adsorption characterization of ordered ordered organic-inorganic nanocomposite materials[J]. Chemistry of Materials, 2001, 13(10): 3169-3183.
[5] Yang D R(杨德仁). Test and analysis of semiconductor materials(半导体材料测试与分析)[M]. Beijing：Science Press(科学出版社), 2010: 11.
