摘要
采用水热法制备了Al掺杂的锂二次电池正极材料LiV3-xAlxO8,并用X射线衍射和扫描电镜对材料的晶体结构和形貌进行了表征。以50mA.g-1进行恒流充放电测试,结果表明Al掺杂能够明显改善材料的电化学性能。在掺杂改性的LiV3-xAlxO8材料中,LiV2.93Al0.07O8的初始容量最高,达到325mAh.g-1。当掺杂量为x=0.04时,材料的循环性能最佳。LiV2.96Al0.04O8经20次循环后仍保持179mAh.g-1的比容量,且充放电效率始终维持在98%左右。
Al doped lithiated vanadium oxides LiV3-xAlxO8 as promising positive electrode material for secondary lithium batteries are prepared with a hydrothermal process. The crystalline phase is characterised by powder X- ray diffraction and the morphology is observed by scanning electron microscope. The electrochemical properties of synthesized samples are investigated by galvanostatic charge and discharge at a current density of 50 mA·g-1. The electrochemical properties were greatly improved via Al doping. Among the doping modified material LiV3-xAlxO8, the maximal initial specific discharge capacity belongs to LiV293Al0.07O8 which can attain 325 mAh·g-1. The most excellent performance can be achieved when x=0.04. The LiV2.96Al0.04O8 material preserves a high charge -discharge efficiency of around 98% and keep a special capacity of 179 mAh·g-1 after 20 cycles.
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2009年第8期1379-1383,共5页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.20573047)
山东省自然科学基金(No.Y2008B64)
山东省优秀中青年科学家奖励基金(No.2006BS09001)资助项目
关键词
正极材料
水热合成
钒酸锂
掺杂
positive electrode material
hydrothermal synthesis
lithium trivanadate
doping
