中文摘要：

采用直径为40am的多壁纳米炭管（MWCNT）膜作为正极材料，研究了锂．空气电池的充放电和循环性能。以500mA／g的电流在2．3—4．6V（vs．Li＋／Li）循环，首次放电比容量达13800mAh／g。限制充放电比容量为3000mAh／g时。采用恒流充放电，可稳定循环15次；直径600nm的碳纤维正极材料的首次放电比容量仅为2070mAh／g。MWCNT表现出更高的催化活性。

英文摘要：

The discharge-charge curve and eyeliability were investigated using muhiwalled carbon nanotube （MWCNT）films with diameters of 40 nm as cathode materials for Li-air batteries. The initial discharge capacity was up to 13 800 mAh/g at a current of 500 mA/g in 2. 3 - 4. 6 V（ vs. Li ＋/Li）. When limited the discharge capacity of 3 000 mA h/g,it lasted for 15 cycles without the capacity decay. The electrochemical performance of carbon fiber with diameters of 600 nm were investigated and the relatively low initial discharge capacity of 2 070 mA h/g was obtained under the same conditions. MWCNT exhibited the higher catalytic activity.