CAJ | 학술논문

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50 mA·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325 mAh·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179 mAh·g-1的比容量,且充放电效率始终维持在98%左右.
채용수열법제비료Al참잡적리이차전지정겁재료LiV3-xAlxO8,병용X사선연사화소묘전경대재료적정체결구화형모진행료표정.이50 mA·g-1진행항류충방전측시,결과표명Al참잡능구명현개선재료적전화학성능.재참잡개성적LiV3-xAlxO8재료중,LiV2.93Al0.07O8적초시용량최고,체도325 mAh·g-1.당참잡량위x=0.04시,재료적순배성능최가.LiV2.96Al0.04O8경20차순배후잉보지179 mAh·g-1적비용량,차충방전효솔시종유지재98%좌우.
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 LiV2.93Al0.07O8 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.