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ID:32462367
大小:1.94 MB
页数:58页
时间:2019-02-06
《v基固溶体合金结构和电化学性能研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要本文以改善v簇固溶体合愈的电化学性能为目的,程对贮氢合金研究现状进行了深入分析的基础上,从Ti.nv_Mn合金入手,j皴行了一系列组分优他瓣研究工佟。剃翅XRD、SEM-EDS分析手段,研究了合盒Ti04ZrolVl1Mno.5Cro1Ni。、Tio,Zro.iVliMno5Nio,4Crx、Tio.4Zro。lVxMno.5Nio,3Cro.1和Tio.4ZroIVliMnxNio.4-Cro.2的结构、表面形貌及组成,研究结果表明这些合金均幽BCC主棚和C14Laves第二超筑藏,显第二鞠=}§羞主稳菇赛撰窭,形藏阚获缝构,怒爨了电俄化相和微集流体的作用。
2、通过测定放电容最、荷电保持率、高倍攀放电、容量保持率,研究了不同元素含量对合众电纯学性能瓣影响。结巢淡暖,Ni斡添搬健进了篱二穰静生成,改善了会金电极静溆经亿活性,20。C下,疆Ni禽璧豹增热,合金电檄的各项电化学性能均得到改善,x=0+4时,最高放电容量为398.2mAh/g,x=0.8时,容量保持率Sgo高达84.3%:Cr的添加服延长了合金的矮蓼毒愈,毽帮侵念金戆敖毫彀藤莛线垂嚣令平台躐羹一拿平台,蹲低了最大放电容量;Mn含量的增加,改善了合金的高倍率放电性能;v含墩的增加,提高了合金的荷电保持率。关键谰MH-Ni电漉;负掇耱辩;V基露溶体会金;结孛句;泡纯
3、学毪糍燕山大学工学硕士学位论文AbstractThepurposeofthisworkistoimproveelectrochemicalperformanceofV-basedsolidsolutionalloy.Inthispaper,compositonoptimizingonTi—Zr-v_Mnalloyhasbeendone.basedondeeplyanalysisoncurrentsituationofresearchonhydrogenstoragealloy.Thestructure,surfacemorphologyandcomposition
4、oftheTi0.4Zro1Vl1MnosCro1Nix,Ti0.4Zro1VI1Mno5Nio4Crx,Tio4zr01VxMn0.5Nio3一CrolandTio4ZrolVliMnxNi0,4Cro2alloyswereinvestigatedbymeansofXRDandSEM—EDSanalyses.ItisshownthatthesealloysallconsistofBCCmainphaseandC14Lavessecondaryphase.Andthesecondaryphaseprecipitatesalongthegrainboundaryin
5、theformofanetwork,whichservesasaelectrocatalystandmicro.currentcollector.TheInfluenceofdifferentelementcontentonelectrochemicalperformanceofthealloyisa/soinvestigatedbymeasuringdischargecapacity,chargeretention,high—ratedischargeabilityandcapacityretention.AdditionofNiimproveselectroc
6、atalyticalactivityofthealloy.At20"C,theelectrochemicalperformanceofthealloyisimprovedwhentheNicontentisincreased.Andthemaxiumdischargecapacityis398.2mAh/gatx=0.4,thecapacityretention$90isupto84.3%atx=0.8.AdditionofCrraisescyclelife诵tlldecreasingmaximumdischargecapacityowingtothedecrea
7、seoftwovoltageplateaustoonevoltageplateauonthedischargevoltagecurve,andtheincreaseinMnandVleadstotheimprovementsofhigh-mtedischargeabilityandchargeretentionrespectively.KeywordsMH-Nibattery;negativeelectrodematerial;V-basedsolidsolutionalloy;structure;electrochemicalperformanceII第1章绪论
8、1.1选题
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