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制备了一系列锰系氧化物的纳米棒,作为锂空气电池中的催化剂,对其放电容量和循环性能进行了测试.结果表明高比表面的催化剂有利于Li_2O_2的分解,使电池的循环性能大大的提高.以刺球型γ-MnO_2为催化剂的锂空气电池具有最高的可逆比容量,循环5圈后仍有2 350 mAh·g~(-1),相对整个电极的比容量为1 175 mAh·g~(-1),是常规锂电池的10倍.根据不同MnO_x催化剂所表现出的不同催化性能,提出了可能的催化剂失效机理.
A series of manganese oxide-based nanorods were prepared and used as catalysts in lithium-air batteries to test their discharge capacity and cycle performance. The results show that the catalysts with high specific surface area are favorable for the decomposition of Li 2 O 2 and greatly improve the cycling performance of the batteries The lithium-air battery with spherule-type γ-MnO 2 catalyst has the highest reversible specific capacity, with 2 350 mAh · g -1 after 5 cycles, and the specific capacity of the whole electrode is 1 175 mAh · G ~ (-1), which is 10 times that of the conventional lithium battery.According to the different catalytic performance of different MnO_x catalysts, a possible catalyst failure mechanism is proposed.