罗大为
,
陈佳明
,
李世伟
,
陈玉奇
,
李志军
,
李雪
人工晶体学报
采用超临界干燥法制备了碳气凝胶( Carbon Aerogels,CA),然后通过简单的化学还原法制备CA/SnSb复合负极材料。采用XRD和SEM等手段对材料的结构及形貌进行了表征,利用恒电流充放电测试了材料的循环性能。研究结果表明,碳气凝胶表现出纳米多孔三维网络结构,当对SnSb合金采用碳气凝胶修饰后,纳米SnSb颗粒包含在碳气凝胶的网络骨架中,呈现出碳气凝胶和纳米SnSb合金颗粒相互交错分布的结构,极大改善了复合材料的团聚性。 CA/SnSb复合负极材料首次放电容量高达1120.2 mAh·g-1,循环50次后放电容量仍达到557.3 mAh· g-1,远高于未经碳气凝胶修饰的SnSb合金。循环性能的改善主要归因于碳气凝胶的引入,不仅极大的改善了复合材料的团聚现象,而且可以缓冲SnSb合金在充放电过程中体积变化。
关键词:
碳气凝胶
,
SnSb
,
循环性能
,
锂离子电池
,
负极
Zhufeng HOU
,
Aiyu LI
,
Zizhong ZHU
,
Meichun HUANG
,
Yong YANG
材料科学技术(英文)
SnSb has attracted a great attention in recent investigations as an anode material for Li ion batteries. The formation energies and electronic properties of the Li intercalations in SnSb have been calculated within the framework of local density functional theory and the first-principles pseudopotential technique. The changes of volumes, band structures, charge density analysis and the electronic density of states for the Li intercalations are presented. The results show that the average Li intercalation formation energy per Li atom is around 2.7 eV.
关键词:
SnSb
,
null
,
null
,
null