氧化亚锰/ 石墨烯复合材料的简易合成及其高效储锂性能

Easy synthesis of MnO-graphene hybrids for high-performance lithium storage

摘要: 在不添加锰源的情况下,将改进Hummers 法制备的硫酸锰/ 氧化石墨烯悬浊液直接通过NaOH 碱溶液原位沉淀形成四氧化三锰/ 氧化石墨烯复合物,并在氢气气氛下处理得到氧化亚锰/ 石墨烯复合材料。将该复合材料用于锂离子电池的负极材料,锂离子电池性能优良。在100mA·g^-1 电流密度下,其比容量达到870mAh·g^-1 ,明显高于相同电流密度下氧化亚锰的比容量(456mAh·g^-1 )。即使在1600mA·g^-1 的高电流密度下,其比容量达390mAh·g^-1 。这种简单、高效的合成方法可为合成锰基氧化物和石墨烯的复合材料提供一种新思路。

Abstract: Graphene oxide was produced using a modified Hummers method and used to produce a MnSO₄ -graphene oxide (MnSO₄-GO) hybrid which was then transformed into a MnO-graphene hybrid by precipitation with NaOH followed by hydrogen reduction. The MnO-graphene hybrid shows a high specific capacity of 870 mAh·g^-1 at 100 mA·g^-1 as an anode material for lithium ion batteries, which is much higher than that of bare MnO (around 456 mAh·g^-1 ). A capacity of 390 mAh·g^-1 could be maintained even at a high current density of 1 600 mA·g^-1 . This green and highly efficient approach offers a new technique for the synthesis of MnOx-graphene battery materials.