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To improve the electrochemical properties of AB₅-type hydrogen storage alloy used as negative electrodes of Ni-MH batteries, La_0.58Ce_0.20Zr_0.02Sm_0.2(Ni_0.85Co_0.03Mn_0.05Al_0.07)_5+x(x=0, 0.10, 0.15, 0.30, 0.45) hydrogen storage alloys were prepared by medium-frequency induction vacuum melting method, and the effect of x value on the phase structure and electrochemical properties of hydrogen storage alloys was systematically investigated. The results show that hydrogen storage alloys with different x values are mainly composed of main LaNi₅ phase and Ni₂MnAl phase. As x increases from 0 to 0.45, the abundance of LaNi₅ phase first increases and then decreases; lattice parameter a decreases gradually; c first increases and then decreases; c/a ratio rises gradually; and cell volume presents a decreasing trend. The hydrogen desorption plateau pressures of alloy electrodes with x ranging from 0 to 0.45 meet the requirement of 0.01-0.5 MPa for negative electrode materials of automotive Ni-MH batteries. With the increase of x, the maximum discharge capacity C_max decreases sequentially, while the capacity retention rate S₁₀₀ increases first and then decreases. The alloy electrode with x=0.15 exhibits optimal comprehensive properties:C_max of 313.2 mAh/g, S₁₀₀ of 94.69%, and high-rate discharge ability HRD_{3 000} of 60.35% at discharge current density of 3 000 mA/g. The high-rate discharge performance of hydrogen storage alloy electrodes with different x values is determined by both charge transfer rate and hydrogen diffusion rate.

, authors=Qingke FAN¹, Qinghua MENG², Kexin WANG³, authorsList=Qingke FAN, Qinghua MENG, Kexin WANG, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314908108229538364, articleId=1314908107696861754, tenantId=1146029695717560320, journalId=1235980550691926019, language=CN, title=汽车镍氢电池负极用AB₅型储氢合金成分设计与电化学性能, columnId=1236276110049202322, journalTitle=矿冶工程杂志, columnName=材料, runingTitle=null, highlight=null, articleAbstract=

为了提高镍氢电池负极用AB₅型储氢合金的电化学性能，采用中频感应真空熔炼的方法制备了La_0.58Ce_0.20Zr_0.02Sm_0.2-（Ni_0.85Co_0.03Mn_0.05Al_0.07)_5+x（x=0、0.10、0.15、0.30、0.45）储氢合金，研究了x值对储氢合金相结构和电化学性能的影响。结果表明，不同x值的储氢合金均由主相LaNi₅相和Ni₂MnAl相组成，随着x值从0增至0.45，LaNi₅相丰度先增后减，晶胞参数a逐渐减小，晶胞参数c先增大后减小，c/a逐渐增大，晶胞体积逐渐减小。x=0~0.45储氢合金电极的放氢平台压均满足汽车用镍氢电池负极材料对放氢平台压介于0.01~0.5 MPa的要求；随着x值从0增至0.45，最大放电容量C_max依次减小，容量保持率S₁₀₀先增大后减小。x=0.15时的储氢合金电极具有较优的综合性能（C_max为313.2 mAh/g，S₁₀₀为94.69%，放电电流密度3 000 mA/g时的高倍率放电性能HRD_{3 000}为60.35%）。不同x值储氢合金电极的高倍率放电性能由电荷转移速率和氢扩散速率共同决定。

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范庆科（1991—），男，浙江江山人，硕士，副教授，主要研究方向为汽车电池材料等。E-mail: qingkefan91@126.com

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范庆科（1991—），男，浙江江山人，硕士，副教授，主要研究方向为汽车电池材料等。E-mail: qingkefan91@126.com

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