碳气凝胶修饰SnSb复合负极材料的制备及性能研究  

Systhesis and Performance of SnSb Anode Materials Modified by Carbon Aerogels

作　　者：罗大为[1] 陈佳明[1] 李世伟[1] 陈玉奇[1] 李志军[2] 李雪 

机构地区：[1]深圳职业技术学院应用化学与生物技术学院,深圳518055 [2]深圳职业技术学院工业中心,深圳518055 [3]深圳市超材料制备与封装技术重点实验室,深圳518055

出　　处：《人工晶体学报》2017年第1期8-12,共5页Journal of Synthetic Crystals

基　　金：超材料电磁调制技术国家重点实验室项目(2011DQ782011);广东大学生科技创新培育专项资金(pdjh2016b0705);广东省高等学校优秀青年教师培养计划(YQ2013191);深圳市科创委项目(JCYJ20160523113743114)

摘　　要：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/Sn Sb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Sn Sb合金采用碳气凝胶修饰后,纳米Sn Sb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Sn Sb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/Sn Sb复合负极材料首次放电容量高达1120.2 m Ah·g-1,循环50次后放电容量仍达到557.3 m Ah·g-1,远高于未经碳气凝胶修饰的Sn Sb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Sn Sb合金在充放电过程中体积变化。Carbon aerogels were synthesized by supercritical drying method,then a carbon aerogels / Sn Sb composite was successfully prepared from carbon aerogels modification of Sn Sb by a simple chemical reduction method. Both the structure and the morphology of the Sn Sb and CA / Sn Sb powders were characterized by X-ray diffraction and SEM. The samples were used as active anode materials for lithiumion batteries,and their cycle performance was examined by constant current charge-discharge cycling.The results show that carbon aerogels exhibited nano porous three-dimensional network structure,and CA / Sn Sb is obtained when the Sn Sb was modified by carbon aerogels. The feature of CA / Sn Sb was carbon aerogels and Sn Sb particles mutually staggered distribution,and carbon aerogels particles were contained in the network backbone,then reunion of CA / Sn Sb was greatly improved. The first discharge capacity of CA / Sn Sb is measured as 1120. 2 m Ah·g^-1and a large reversible capacity of 557. 3 m Ah·g^-1is observed after 50 cycles,which is far higher than that of Sn Sb without modification by carbonaerogels. The capacity retention of CA / Sn Sb was improved due to the improving of reunion and alleviating volume expansion during the charge-discharge process by addition of carbon aerogels.

关 键 词：碳气凝胶 SnSb 循环性能 锂离子电池 负极 

分 类 号：TM912[电气工程—电力电子与电力传动]