CAJ | 학술논문

采用溶胶-凝胶-自蔓延燃烧法合成了LiNi0.5Mn1.5O4和LiCr0.1Ni0.45Mn1.45O4两种高电压正极材料.通过X射线衍射(XRD)表明铬离子掺杂未改变LiNi0.5Mn1.5O4的晶型结构,但改善了其晶型生长.扫描电镜(SEM)表明两种样品呈规则正八面体外形,颗粒较均匀,LiNi0.5Mn1.5O4平均粒径大约为400 nm,LiCr0.1Ni0.45Mn1.45O4平均粒径大约为200 nm.电化学性能测试结果表明,在1C放电倍率下,两种电池的首次放电比容量分别为111.0 mAh/g和121.5 mAh/g,以容量保持率为首次放电比容量85％为截止条件,分别可以实现32个和51个稳定循环.在此条件下,LiCr0.1Ni0.45Mn1.45O4/Li电池的平均中值电压为4.55 V,略高于LiNi05Mn1.5O4/Li电池4.51 V.倍率性能测试结果表明,LiCr0.1Ni0.45Mn1.45O4/Li电池及LiNi0.5Mn1.5O4/Li电池在0.5C、1C下放电比容量分别可保持0.2 C时的91.9％、87.1％和91.1％、83.6％.铬离子掺杂可明显改善LiNi0.5Mn1.5O4的综合性能.
채용용효-응효-자만연연소법합성료LiNi0.5Mn1.5O4화LiCr0.1Ni0.45Mn1.45O4량충고전압정겁재료.통과X사선연사(XRD)표명락리자참잡미개변LiNi0.5Mn1.5O4적정형결구,단개선료기정형생장.소묘전경(SEM)표명량충양품정규칙정팔면체외형,과립교균균,LiNi0.5Mn1.5O4평균립경대약위400 nm,LiCr0.1Ni0.45Mn1.45O4평균립경대약위200 nm.전화학성능측시결과표명,재1C방전배솔하,량충전지적수차방전비용량분별위111.0 mAh/g화121.5 mAh/g,이용량보지솔위수차방전비용량85％위절지조건,분별가이실현32개화51개은정순배.재차조건하,LiCr0.1Ni0.45Mn1.45O4/Li전지적평균중치전압위4.55 V,략고우LiNi05Mn1.5O4/Li전지4.51 V.배솔성능측시결과표명,LiCr0.1Ni0.45Mn1.45O4/Li전지급LiNi0.5Mn1.5O4/Li전지재0.5C、1C하방전비용량분별가보지0.2 C시적91.9％、87.1％화91.1％、83.6％.락리자참잡가명현개선LiNi0.5Mn1.5O4적종합성능.