| Effect of the amount of zinc-doped on the electrochemical performance of nickel hydroxide |
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| 作者姓名： | YU Danmei ZHOU Shangqi CHEN Changguo WEN Li WANG Huaqing College of Chemistry and Chemical Engineering Chongqing University Chongqing P.R. China College of Material Science and Engineering Chongqing University Chongqing P.R. Chin |
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| 作者单位： | YU Danmei 1，ZHOU Shangqi 2，CHEN Changguo 1，WEN Li 1，WANG Huaqing 2 1College of Chemistry and Chemical Engineering，Chongqing University，Chongqing 400030，P.R. China 2College of Material Science and Engineering，Chongqing University，Chongqing 400030，P.R. China |
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| 摘 要： | 1.IntroductionInrecentyears,theNi-MHbattery,akindofnewtypesecondarybatterydevelopedonthebaseofrechargeableNi-Cdbattery,hasattractedtheattentionofmostcustomersintheworldduetotheirexcellentperformancessuchashighpowerdensity,verygoodcyclability,highspecificcapacityandlessenviron-mentalimpact.Currently,theNi-MHbatteryiswidelyusedasapowerforportableelectricdevices,electricvehicles,portablevideos,andsomeimportantsmallapplications1-3].Nickelhydroxideiscommonlyusedastheactivematerialfornickelposit…
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| 关 键 词： | 氢氧化镍 电化学性质 锌掺杂 微乳液 电池 能量密度 |
Effect of the amount of zinc-doped on the electrochemical performance of nickel hydroxide |
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| YU Danmei,ZHOU Shangqi,CHEN Changguo,WEN Li,WANG Huaqing College of Chemistry and Chemical Engineering,Chongqing University,Chongqing,P.R. China College of Material Science and Engineering,Chongqing University,Chongqing,P.R. Chin.Effect of the amount of zinc-doped on the electrochemical performance of nickel hydroxide[J].Journal of Chongqing University,2004,3(1):74-77. |
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| Authors: | YU Danmei Zhou Shangqi CHEN Changguo WEN Li Wang Huaqing |
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| Abstract: | The nickel hydroxide prepared by micro-emulsion method was doped by coprecipitated Zn. The effect of the amount of zinc-doped on the properties of Ni(OH)2 such as the reversibility of the electrode reaction, the charge efficiency and active material utilization ratio of nickel electrode, and discharge specific capacity was studied by cyclic voltammetry and constant current charge-discharge tests. The results indicate that the specific discharge capacity of nickel hydroxide obtained by microemulsion method is much less than its theoretical value because the transfer of electrons and the diffusion of protons H are hindered owing to its crystal grain size in a nanometer range and thus possessing higher crystal interface resistance. The crystal cells are swelled and the crystal defects increased in prepared material due to part of Ni2 substituted by Zn2 when zinc and nickel hydroxide are coprecipitated. Hence, the electrons and protons H in the electrode reaction are transferred easily, the electrochemical behavior of nickel electrode is improved and discharge specific capacity is promoted. However, the performance of Ni(OH)2 is gradually enhanced with the addition of zinc-doped at first, while slowly decreased after the content of zinc is added to a certain value. The best electrode reaction reversibility, the highest electrode charge efficiency, the highest active material utilization ratio and the largest specific capacity on discharge are available when the mass fraction of Zn doped in nickel hydroxide by coprecipitation reaches 2.5 %. |
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| Keywords: | nickel hydroxide: coprecipitation zinc-doped micro-emulsion |
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