| Influences of heat treatment on electrochemical characteristics of La0.75Mg0.25Ni2.8Co0.5 hydrogen storage electrode alloy |
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| 作者姓名： | 刘永锋 潘洪革 高明霞 朱云峰 雷永泉 |
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| 作者单位： | Department of Materials Science and Engineering，Zhejiang University，Hangzhou 310027，China，Department of Materials Science and Engineering，Zhejiang University，Hangzhou 310027，China，Department of Materials Science and Engineering，Zhejiang University，Hangzhou 310027，China，Department of Materials Science and Engineering，Zhejiang University，Hangzhou 310027，China，Department of Materials Science and Engineering，Zhejiang University，Hangzhou 310027，China |
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| 基金项目： | Project( 5 0 1310 40)supportedbytheNationalNaturalScienceFoundationofChina |
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| 摘 要： | 1 ＩＮＴＲＯＤＵＣＴＩＯＮＤｕｒｉｎｇｔｈｅｌａｓｔｄｅｃａｄｅ ,ｔｈｅｄｅｍａｎｄｆｏｒｔｈｅｎｉｃｋｅｌ/ｍｅｔａｌ ｈｙｄｒｉｄｅ (Ｎｉ/ＭＨ )ｓｅｃｏｎｄａｒｙｂａｔｔｅｒｉｅｓｈａｓｂｅｅｎｇｒｏｗｉｎｇｒａｐｉｄｌｙｂｅｃａｕｓｅｏｆｔｈｅｉｒｈｉｇｈｅｎｅｒｇｙｄｅｎｓｉｔｙ ,ｈｉｇｈＨＲＤ ,ｌｏｎｇｃｈａｒｇｅ ｄｉｓｃｈａｒｇｅｃｙｃｌｅｌｉｆｅａｎｄｆｒｉｅｎｄｌｙｅｎｖｉ ｒｏｎｍｅｎｔａｌｐｒｏｐｅｒｔｉｅｓ14 ] .Ｈｙｄｒｏｇｅｎｓｔｏｒａｇｅａｌｌｏｙｓ ,ａｓｔｈｅｎｅｇ…
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| 关 键 词： | 热处理 储氢合金 镧镁镍钴合金 电化学性质 |
Influences of heat treatment on electrochemical characteristics of La0.75 Mg0.25 Ni2.8 Co0.5 hydrogen storage electrode alloy |
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| LIU Yong-feng,PAN Hong-ge,GAO Ming-xia,ZHU Yun-feng,LEI Yong-quan.Influences of heat treatment on electrochemical characteristics of La0.75Mg0.25Ni2.8Co0.5 hydrogen storage electrode alloy[J].Transactions of Nonferrous Metals Society of China,2003,13(1):25-28. |
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| Authors: | LIU Yong-feng PAN Hong-ge GAO Ming-xia ZHU Yun-feng LEI Yong-quan |
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| Abstract: | The influences of annealing treatment on the electrochemical and structural properties of La0.75 Mg0.25-Ni2.8 Co0.5 hydrogen storage alloy were investigated by means of electrochemical studies and X-ray diffraction(XRD)analyses. The XRD results reveal that the peak width gets narrower with increasing annealing temperature, whichcan be ascribed to the structural change and more homogeneous composition after being annealed. Electrochemicalstudies show that the discharge capacity and the cycle stability of the alloy electrodes increase after being annealed.The maximum discharge capacity, exchange current density J0 and limiting current density JL of the as-cast alloy are 388mA @ h/g, 340. 5 mA/g and 3 068 mA/g, respectively, and they are increased to 400 mA @ h/g, 372. 1 mA/g and 3 399mA/g for the alloy annealed at 1 123 K for 8 h, respectively. Meanwhile, as the discharge current density is 1 250 mA/g,the high rate dischargeability(HRD) increases from 77.4 % for the as-cast alloy to 83.3 % for the alloy annealed at 1123 K. |
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| Keywords: | heat treatment La 0 75Mg 0 25Ni 2 8Co 0 5 hydrogen storage alloy electrochemical properties |
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