CAJ | 학술논문

通过共沉淀法制备了正极材料 Li1．1 Mn1．85 Al0．05 O4的前驱体 M3 O4，并探究600～900℃区间烧结温度对细粒度材料样品电化学性能的影响规律．通过 XRD 物相分析、SEM图像分析，激光粒度测试、电化学滴定测定 Mn 价态分布、dQ ／dV －V 微分容量分析以及恒电流充电循环测试，研究了 Li1．1 Mn1．85 Al0．05 O4材料的综合电化学性能等．实验结果表明：经过细化的样品在高温烧结时，存在不同程度的氧缺陷，并随温度升高而增大．细粒样品超过750℃烧结，氧缺位在晶格显著出现并伴随着 Mn3＋富化、Mn4＋贫化现象，并导致晶格膨胀，结构稳定性下降，循环性能劣化．Mn尖晶石系材料制备时应防止粒度过细，并在750℃以下烧结处理．
통과공침정법제비료정겁재료 Li1．1 Mn1．85 Al0．05 O4적전구체 M3 O4，병탐구600～900℃구간소결온도대세립도재료양품전화학성능적영향규률．통과 XRD 물상분석、SEM도상분석，격광립도측시、전화학적정측정 Mn 개태분포、dQ ／dV －V 미분용량분석이급항전류충전순배측시，연구료 Li1．1 Mn1．85 Al0．05 O4재료적종합전화학성능등．실험결과표명：경과세화적양품재고온소결시，존재불동정도적양결함，병수온도승고이증대．세립양품초과750℃소결，양결위재정격현저출현병반수착 Mn3＋부화、Mn4＋빈화현상，병도치정격팽창，결구은정성하강，순배성능열화．Mn첨정석계재료제비시응방지립도과세，병재750℃이하소결처리．
A M3 O4 -type precursor of Li1 .1 Mn1 .85 Al0.05 O4 cathode material is prepared by co -precipitation to in-vestigate the impact tendencies of sintering at temperatures from 600℃ to 900℃ on the electrochemical properties of fine particulate.XRD,SEM,particle size distribution test by laser approach,electrochemical titration technique for Mn oxidation states,dQ/dV -V frofiles and galvanostatic charge -discharge tests are carried out for insight into the comprehensive electrochemical performance of the prepared materials.The experimental results show that a diverse degree of oxygen deficiencies appears in the samples sintered at higher temperatures,and they enrich with the elevated temperatures.As fine particulate samples are sintered at temperature above 750℃,oxygen deficien-cies occur significantly in lattice,accompanied with Mn3 + enrichment,Mn4 + depletion,a slight lattice expansion, decrease of the structural stability,and deterioration of the cycleability.An adequate preparation processing for spinel -type LiMn2 O4 as cathode materials should avoid excessive break -down on milling and be sintered below 750 ℃.