摘要
采用二次干燥的化学共沉淀法制备出了LiNi0.5Mn1.5O4电池正极材料的前躯体。通过研究反应物浓度、聚沉剂、滤饼含水量和干燥方式等对产物晶体结构和振实密度的影响,得到制备高密度锂离子电池正极材料前躯体的适宜条件为:NiSO4为0.375 mol/L,少量多次的添加聚沉剂,滤饼含水量为28%以及采用二次干燥的方式;该条件下可得到振实密度为1.74 g/cm3的LiNi0.5Mn1.5O4前躯体粉末。化学分析、能谱分析、XRD以及SEM等结果表明:前驱体是镍锰比为1:3,具有较高结晶度的片状结构材料。充放电测试表明:以此高密度前躯体所制备的LiNi0.5Mn1.5O4具有较好的电化学充放电性能。
Abstract：The precursor of LiNi0.5Mn1.5O4 cathode material with high density was synthesized by two-dryness co-precipitation method.The feasible parameters were found out by studying the relationship between the density of precursor and concentration of reactants,manner of adding agglomerating agent,remaining water in filter cake and manner of dryness.The highest density（1.74 g/cm3）of precursor can be achieved under optimized condition：NiSO4 0.375 mol/L,adding coagulation agent by many times,28%of water in filter cake and two-step dryness.Results of chemical and XPS analysis,XRD and SEM show the ratio of Ni to Mn is 1：3 and the precursor shows slice structure with well crystallization.Test of charge/discharge shows LiNi0.5Mn1.5O4 from such precursor exhibits a good electrochemical activity.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2011年第12期1676-1680,共5页
Chemical Research and Application
基金
新乡市科技攻关项目(092300410191)
