摘要
利用纳米二氧化钛(P25)粉为钛源,Li2CO3为锂源,采用固相法及高能球磨法制备亚微米级尖晶石Li4Ti5O12。将Li4Ti5O12与碳纳米管(CNTs)制备成复合电极作为工作电极与锂片组成电池进行电化学性能测试。通过SEM,XRD等表征材料形貌、结构及粒径分布,通过充放电测试表征其电化学性能。结果表明,在800℃合成温度及8 h合成时间制备条件下可以得到小尺寸且颗粒均匀的亚微米晶体Li4Ti5O12,且合成的产物电化学性能最佳。在800℃及8 h合成条件下,产物首次充放电容量分别为188.0 mAh/g和189.1 mAh/g,首次充放效率为99.4%,且具有良好的可逆性。
Spinel Li4Ti5O12 anode material was synthesized by solid-state method and high energy ball mill using P25 and Li2CO3 as reactants.The electrochemical performance was tested by the conbination electrode of Li4Ti5O12 and carbon nanotubes（CNTs） as work electrode and lithium metel foil as counter electrode.The morphology and the structure of the samples were characterized by scanning electron microscopy（SEM）,X-ray diffraction（XRD）.The electrochemical performance of the samples has been investigated by galvanostatic charge-discharge tests.The results showed that spinel Li4Ti5O12 of small grain sizes and uniform particles and the best electrochemical performance were prepared at the preparation conditions of the synthesis temperature of 800 ℃ and the synthesis time of 8 h.The first time charge-discharge capacity of the sample prepared in this condition was 188.0 mAh/g and 189.1 mAh/g,respectively.The first charge-discharge efficiency of the sample was 99.4% and there was good reversibility of the sample.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2012年第2期348-353,共6页
Journal of Synthetic Crystals
基金
国家自然科学基金(20971027)资助项目
高等学校博士学科点专项科研基金(20094420110005)
广东省自然科学基金(9251009001000006)
广东省科技计划项目(2010A090200063
2010A011300041)
广州市科技计划项目(2009J1-C381)
东莞市高等院校科研项目(200910814033)
