| Effects of Mm(NiCoAlMn)_5 hydrogen storage alloy coated with Ni-Co-P alloy by electroless plating on electrochemical properties of hydride electrodes |
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| 作者姓名： | 孙春文 郭占成 唐致远 郭鹤桐 |
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| 作者单位： | Laboratory for Solid State Ionics，Institute of Process Engineering，Chemical Engineering School，Chemical Engineering School Institute of Physics，Chinese Academy of Science，Beijing 100080，China，Institute of Process Engineering，Chinese Academy of Sciences，Bejing 100080，China，Chinese Academy of Sciences，Bejing 100080，China，Tianjin University，Tianjin 300072，China，Tianjin University，Tianjin 300072，China |
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| 基金项目： | Project (973 10 3 711)supportedbytheCommitteeofScienceandTechnologyofTianjin |
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| 摘 要： | 1 INTRODUCTIONNickel metalhydride (MH Ni)rechargeablebatterieswithhydrogenstoragealloysasthenegativeelectrodematerialhaveattractedincreasingattentionsbecauseofseveralinherentadvantages16 ] .Sofar ,manymulti component,mischmetal based ,hydro gen storagealloyshavebeendevelopedtomeetthere quirementofhighcyclinglife ;theseincludesubstitu tionofthenickelbyMn ,CoandAl7] .Thecomposi tionofthealloyisimportant ,andtheeffectsofsur facecompositionandmorphologyarealsosignificant.Micro encapsulat…
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Effects of Mm(NiCoAlMn)5 hydrogen storage alloy coated with Ni-Co-P alloy by electroless plating on electrochemical properties of hydride electrodes |
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| SUN Chun wen ,GUO Zhan cheng ,TANG Zhi yuan ,GUO He tong.Effects of Mm(NiCoAlMn)_5 hydrogen storage alloy coated with Ni-Co-P alloy by electroless plating on electrochemical properties of hydride electrodes[J].Transactions of Nonferrous Metals Society of China,2003,13(4). |
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| Authors: | SUN Chun wen GUO Zhan cheng TANG Zhi yuan GUO He tong |
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| Affiliation: | SUN Chun wen 1,2,GUO Zhan cheng 2,TANG Zhi yuan 3,GUO He tong 3 |
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| Abstract: | The effect of chemical plating with Ni Co P alloy on the properties of MH electrodes is investigated. The results show that the efficiency of storage alloy and the activation of MH electrode have been improved by introducing 1.74% cobalt in the Ni Co P alloy coating. The initial discharge capacity is 208 mAh/g. The maximum discharge capacity gets to 298.5 mAh/g. At the same time the cycle life of MH electrodes is improved. The discharge capacity of MH electrodes coated with Ni Co P is 88% of the maximum discharge capacity after 300 cycles. Whereas the discharge capacity of bare alloy electrodes retains 62% of the maximum capacity after 300 cycles. An increment of discharge capacity is mainly due to the superposition of the oxidation current of Co as well as improved efficiency of microcurrent collection. The effect of Ni Co P alloy coating by electroless plating on the kinetic properties of hydride electrode has been systematically investigated by electrochemical techniques. The results indicate that the kinetic properties of MH electrodes, including exchange current density, limiting current density, have been improved markedly. This improvement of kinetic properties leads to the decrease of the overpotential of anodic and cathodic polarization. |
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| Keywords: | rare earths based hydrogen storage alloys electroless Ni Co P alloy plating MH Ni battery |
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