张发谦论文4

毕业设计（论文）题目锂离子电池高电位正极材料的合成及性能研究系（院）化学与化工系专业化学工程与工艺班级2008级1班学生姓名张发谦学号2008100121指导教师黄兵职称讲师二〇一二年六月二十三日滨州学院学士学位论文II锂离子电池高电位正极材料的合成及性能研究摘要近年来，随着现代科技的发展与进步，人们对于能源的需要越来越迫切。但是商业化的锂离子电池正极材料LiCoO2由于价格高，有毒性，人们一直努力在寻找其替代品。锰酸锂由于价格低廉、无毒而倍受关注。LiNi0.5Mn1.5O4主要利用锰资源，而我国锰资源丰富且价格相对便宜，使得以锰为主的正极材料有很大的应用前景，并且该材料理论容量可达到147mAh/g，具有更高的能量密度，有希望作为动力电池得到应用。本文首先采用溶胶凝胶法和改进固相法制备了LiNi0.5Mn1.5O4，其次探究了在改进固相法合成材料的过程中前驱体粉末压片与否对材料材料电化学性能的影响，最后在利用改进固相法合成材料的基础上探究了碳包覆以及氟掺杂对材料电化学性能的影响，研究结果表明：使用改进固相法合成的材料的放电容量为120mAh/g，而使用溶胶凝胶法法合成的材料的放电容量仅为85mAh/g；合成工艺中压片合成的材料放电容量为115mAh/g，而不压片的材料放电容量为105mAh/g；表面包覆C后材料的放电容量大大降低，仅为34mAh/g；而进行了氟掺杂的材料的电化学性能并未提高。关键词：锂离子电池；正极材料；LiNi0.5Mn1.5O4滨州学院学士学位论文IIISynthesisandpropertiesofhighpotentialscathodematerialforlithiumionbatteryAbstractInrecentyears,withthedevelopmentofmodernscienceandtechnology,theenergyneedsofpeoplemoreandmoreurgent.BecauseofthehighpriceandtoxicityoftheindustrializedLiCoO2cathodematerial,moreattentionhasbeenpaidtothesubstitutesforit.Lithiummanganeseoxideprovesoneofthemostpromisingcathodematerialssinceitisinexpensiveandenvironmentalfriendly.What'smore,manganeseresourcesinchinaisabundantandrelativelycheappricewhichmakesmanganesebasedcathodematerialshavegreatapplicationprospect.Thetheoreticalcapacityis147mAh/gofLiNi0.5Mn1.5O4,soitpossesseshigherenergydensityandispromisingtobeusedinLiionbatteryaspowersourcesforelectricalvehicles.FirstlysolgelmethodandimprovedsolidphasemethodwasusedtosynthesisLiNi0.5Mn1.5O4,secondlytheinfluenceofthetabletsontheelectrochemicalperformanceofthematerialsynthesizebyimprovedsolidphasemethod,finallytheinfluenceofcarboncoatingandfluorinedopingwasstudied,ontheelectrochemicalofLiNi0.5Mn1.5O4wasstudiedindicatethatdischargecapacityofthematerialwhichuseimprovedsolidphasemethodis120mAh/g,whilethedischargecapacityofthematerialsynthesizebysolgelmethodisonly85mAh/g.Thedischargecapacityofthematerialsynthesizebytabletsis115mAh/g,whilethedischargecapacityofthematerialsynthesizebynotabletsis105mAh/g.Thedischargecapacityofthematerialsynthesizebycarboncoatingisgreatlyreduced,only34mAh/g.Whiletheelectrochemicalperformanceofthematerialsynthesizebyfluorinedopingwasnotbeimproved.滨州学院学士学位论文IVKeywords:lithiumionbattery;cathodematerial;LiNi0.5Mn1.5O4.滨州学院学士学位论文i目录引言...................................................................................................................................1第一章锂离子电池及其正极材料概述...........................................................................21.1锂离子电池的发展概况..............................................................................................21.1.1锂离子电池的优点...................................................................................................21.1.2锂离子电池的结构和工作原理...............................................................................31.2LiNi0.5Mn1.5O4正极材料简介......................................................................................51.2.1LiNi0.5Mn1.5O4的结构...............................................................................................51.2.2LiNi0.5Mn1.5O4存在的问题以及改性研究...............................................................51.2.3LiNi0.5Mn1.5O4合成方法...........................................................................................61.3本论文选题意义及主要研究内容..............................................................................6第二章实验部分...............................................................................................................72.1试剂及仪器设备..........................................................................................................72.2电极活性物质的制备过程..........................................................................................72.3LiNi0.5Mn1.5O4材料的电化学性能测试......................................................................72.3.1电池的制备...............................................................................................................72.3.2电池的电化学性能测试...........................................................................................8第三章LiNi0.5Mn1.5O4材料的合成及改进研究.............................................................93.1LiNi0.5Mn1.5O4材料合成方法研究..............................................................................93.1.1溶胶凝胶法与改进固相法合成LiNi0.5Mn1.5O4材料的对比.................................93.1.2LiNi0.5Mn1.5O4材料合成工艺改进研究.................................................................133.2LiNi0.5Mn1.5O4材料的改进研究................................................................................163.2.1表面包覆C对LiNi0.5Mn1.5O4材料的改进研究..................................................163.2.2掺杂F对LiNi0.5Mn1.5O4材料的改进研究...........................................................18结论.................................................................................................................................22参考文献...........................................................................................................................23谢辞...............................................................................................................................25滨州学院学士学位论文1引言商品化