CAJ | 학술논문

采用水热法制备了Mn掺杂改性的锂二次电池钒基层状正极材料LiV3-xMnxO8(X=0.00,0.01,0.02,0.04,0.06,0.08,0.10).用X射线衍射(XRD)和扫描电镜(SEM)对材料的晶体结构和形貌进行表征,并以50 mA·g-1的电流对材料进行恒流充放电测试.研究了Mn掺杂对材料晶体结构和电化学性能的影响.结果表明,Mn掺杂能够明显改善材料的电化学性能.在掺杂改性的LiV3-xMnxO8日材料中,LiV294Mn0.0608的初始容量最高,达到295 mAh·g-1.当掺杂量控制在0.01≤X≤0.08范围内时,LiV3-XMNx08材料均具有较好的循环性能和充放电可逆性,经20次循环后放电比容量都保持在120 mAh·g-1以上,40次循环后都保持在100 mAh·g-1以上,且材料的充放电效率始终维持在93%以上.
채용수열법제비료Mn참잡개성적리이차전지범기층상정겁재료LiV3-xMnxO8(X=0.00,0.01,0.02,0.04,0.06,0.08,0.10).용X사선연사(XRD)화소묘전경(SEM)대재료적정체결구화형모진행표정,병이50 mA·g-1적전류대재료진행항류충방전측시.연구료Mn참잡대재료정체결구화전화학성능적영향.결과표명,Mn참잡능구명현개선재료적전화학성능.재참잡개성적LiV3-xMnxO8일재료중,LiV294Mn0.0608적초시용량최고,체도295 mAh·g-1.당참잡량공제재0.01≤X≤0.08범위내시,LiV3-XMNx08재료균구유교호적순배성능화충방전가역성,경20차순배후방전비용량도보지재120 mAh·g-1이상,40차순배후도보지재100 mAh·g-1이상,차재료적충방전효솔시종유지재93%이상.
The Mn modified lithiated vanadium oxides LiV3-xMnxO8(X=0．00，0．01，0．02，0．04，0．06，0．08，0．10)as promising cathode materials for secondary lithium batteries were prepared using a hydrothermal method．Crystalline phases werg characterized by powder X-ray diffraction(XRD)and the morphology was observed by scanning electron microscopy(SEM)．The electrochemical properties of the synthesized samples were investigated by galvanostatic charge and discharge at a current density of 50 mA·g-1. The effects of manganese doping on crystal stability Were analyzed in terms of the material structure and electrochemical performance．The electrhemical properties were greatly improved after manganese doping．Among the doping modified materials,LiV294Mn0.06O8 showed the highest initial specific discharge capacity which Was 295 mAh·g-1．Good cycle performance was achieved when 0．01≤X≤0．08．All the LiV3-xMnxO8(0．01≤X≤0．08)materials maintained the specific discharge capacities of more than 120 mAh·g-1ater 20 cycles and 100mAh·g-1after 40 cycles thereby preserving the high charge-discharge efficiencies of no less than93%．