摘要
采用十六烷基三甲基溴化铵(CTAB)作模板剂,SnCl·45H2O为无机离子源在水溶液中合成了有序介孔氧化锡材料.通过XRD、N2-吸附脱附、TEM测试手段对合成产物进行表征,并且测试了该材料作为锂离子电池阳极的可逆容量和循环能力.结果表明,合成过程中氨水的加入量对制备有序结构材料至关重要,适量的OH-离子能将Sn(ClxBry)2-单元诱导组装到表面活性剂液晶模板上;介孔材料用于锂离子电池阳极时循环容量保持能力良好;首次不可逆容量高于SnO2理论损失量,原因是介孔材料将锂离子滞留在孔中.
Mesoporous SnO2 was synthesized using a cationic surfactant cetytrimethylammonium bromide （CTAB） as template and tin chloride （SnCl4·5H2O） as inorganic precursor. The product was examined with X-ray diffraction （XRD）, N2-adsorption/desorption isotherms （BET）, and transmission electron microscopy （TEM）. Electrochemical properties of the mesoporous SnO2 were measured as anode of lithium-ion battery. The results showed that a certain amount of ammonium was critical for fabricating of ordered mesoporous structure. OH-ions served as structure director, helping Sn（ClxBry）^2- unit to assemble into liquid crystal and form the ordered mesoporous structure. Electrochemical measurements showed good capacity retaining ability in 40 cycles. Large irreversible capacity loss can be attributed to trapping of Li^＋ ion in the pores.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2008年第4期681-685,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(20363002)资助项目
关键词
介孔
氧化锡
锂离子电池
Mesoporous
Tin oxide
Lithium-ion battery
