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1、第32卷第6期無(wú)機(jī)化學(xué)學(xué)報(bào)Vo1.32No.62016年6月CHINESEJOURNALOFIN0RGANICCHEMISTRY975—982Cr對(duì)V,TiNi。3貯氫合金結(jié)構(gòu)和電化學(xué)性能的影響宋茂成,2張榮華12張雪峰,z趙朝勇z崔旭梅劉甜甜,z同艷維3龐立娟z鄧剛(西華大學(xué)材料科學(xué)與工程學(xué)院,成都610039)(攀枝花學(xué)院材料工程學(xué)院,攀枝花617000)(攀枝花學(xué)院生物與化學(xué)工程學(xué)院,攀枝花617000)摘要:研究了Cr添加量對(duì)V:。TiNi。C~x(X=0,0.2,0.4,0.6)貯氫合金的結(jié)構(gòu)和電化學(xué)性能的影響。結(jié)果表明,所有合金均由V基固溶
2、體主相和TiNi基第二相組成,且第二相呈網(wǎng)狀分布在晶界上,部分呈顆粒狀分布于合金主相之中。隨著Cr含量增大,合金主相的晶胞體積與合金電極的最大放電容量逐漸減小,而循環(huán)穩(wěn)定性逐漸增加,同時(shí)合金電極的動(dòng)力學(xué)性能得到改善。在合金中添加Cr使合金電極的活化性能變差,但添加量的進(jìn)一步增多對(duì)其活化性能影響不大。綜合考慮,VTiNi,Crn4合金的電化學(xué)性能最好,最大放電容量可達(dá)442.20mAh·g~,20次充放電循環(huán)后容量保持率達(dá)81.91%。關(guān)鍵詞:釩基貯氫合金;鎳氫電池;Cr添加;顯微結(jié)構(gòu);電化學(xué)性能中圖分類號(hào):O614.611文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):100
3、1—4861(2016)06.0975.08D0I:10.11862/CJIC.2016.124EffectOfChromiumAdditiononMicrostructuresandElectrochemicalPropertiesofV1TiNi0jAlloySONGMao—Cheng'ZHANGRong—Hua,ZHANGXue—Feng,ZHAOChao-Yong2CUIXu—MeiLIUTian.TianTONGYan.WeiPANGLi—JuanDENGGangz(CollegeofMaterialsScienceandEngineerin
4、g,XihuaUniversity,Chengdu610039,China)(~CollegeofMaterialsEngineering,PanzhihuaUniversity,Panzhihua,Sichuan617000,China)~CollegeofBiologicalandChemicalEngineering,PanzhihuaUniversity,Panzhihuo,Swhuan617000,China)Abstract:ThemicrostructuresandelectrochemicalpropertiesoftheVzlTiNi
5、o.3Cr~=0,0.2,0.4,0.6)hydrogenstorageelectrodealloyswereinvestigated.TheresultsshowedthatallofthealloyswereconsistedoftheV-basedsolidsolutionmainphasewithabodycenteredcubic(bcc)structureandtheTiNi-basedsecondaryphases.Thesecondaryphasesweremainlyinthegrainboundarieswithnetworkdis
6、tribution,andsomeofthesecondaryphaseparticlesweredistributedinthemainphase.ThecellvolumesofthemainphaseandthemaximumdischargecapacityofthealloyelectrodesdecreasedwiththeincreaseofChromium(Cr)content,whilethecyclestabilityofthealloyelectrodeswasgraduallyincreased.Atthesametime,th
7、ekineticperformanceofthealloyelectrodesimproved.TheactivationperformanceofthealloyelectrodesdeterioratedwhentheChromiumelementwasadded,butfurtherincreaseofCrcontentdidnotchangetheactivationperformancesignificantly.TheVzlTiNioCro4alloy.3.收稿日期:2015。10.01。收修改稿日期:2015.12—21。四川省科技支撐計(jì)
8、劃項(xiàng)目(No.2012GZX0089)N1四川省科技創(chuàng)新研究團(tuán)隊(duì)建設(shè)項(xiàng)目(No.2015TD0