| Ti对Ml(NiCoMnTi)_5合金相结构和充放电循环性能的影响 |
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| 引用本文： | 朱光明,雷永泉,陈立新,王启东.Ti对Ml(NiCoMnTi)_5合金相结构和充放电循环性能的影响[J].金属学报,2001(9). |
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| 作者姓名： | 朱光明 雷永泉 陈立新 王启东 |
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| 作者单位： | 厦门大学化学系固体表面物理化学国家重点实验室 厦门361005
(朱光明)，浙江大学材料科学与工程系 杭州310027
(雷永泉，陈立新)，浙江大学材料科学与工程系 杭州310027(王启东) |
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| 基金项目： | 国家自然科学基金资助项目59801008，国家863高新技术计划资助项目 715－004－0060 |
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| 摘 要： | 研究了微量 Ｔｉ在 Ｍｌ（ＮｉＣｏＭｎＴｉ）５合金中的作用．结果表明，在铸态条件下，Ｔｉ几乎全部以 ＴｉＮｉ３第二相的形式在晶界析出，退火处理后 ＴｉＮｉ３相消失，但 ＳＥＭ和 ＥＤＳ表明 Ｔｉ取代了 ＡＢ５型化合物中 Ａ侧的稀土 Ｍｌ；而不是 Ｂ侧的 Ｎｉ．Ｔｉ在 Ａ侧的取代量以 ５％为宜．此时合金在铸态和退火态的放电容量都在 ３１０ ｍＡ·ｈ／ｇ以上．进一步提高取代量虽然会改善循环稳定性，但大大降低了放电容量．
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| 关 键 词： | 贮氢合金 Ti 相结构 电极 |
THE EFFECTS OF TITANIUM ON THE PHASE STRUCTURE AND CHARGE/DISCHARGE PERFORMANCE OF Ml(NiCoMnTi)_5 ALLOY |
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| ZHU Guangming State Key Lab for Physical Chemistry of the Solid Surface and.THE EFFECTS OF TITANIUM ON THE PHASE STRUCTURE AND CHARGE/DISCHARGE PERFORMANCE OF Ml(NiCoMnTi)_5 ALLOY[J].Acta Metallurgica Sinica,2001(9). |
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| Authors: | ZHU Guangming State Key Lab for Physical Chemistry of the Solid Surface and |
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| Affiliation: | ZHU Guangming State Key Lab for Physical Chemistry of the Solid Surface and Department of Chemistry,Xiamen University,Xiamen 361005 LEI Yongquan,CHEN Lixin,WANG Qidong Department of Materials Science and Engineering,Zhejiang University,Hangzhou 3100 |
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| Abstract: | Substitutional effect of small amount of Ti in hydrogen storage electrode alloy Ml(NiCoMnTi)5 was systematically studied. The results show that Ti in the alloy is almost entirely separated out as a second phase of TiNi3 at boundary of the as-cast dendrite. After annealed, TiNi3 phase disappeared, but SEM and EDS analyses indicate that the partially substituted element by Ti is mishmetal Ml, not Ni in B side as expected, i.e. Ti is an A side substituent element. The optimal substitution amount is 5% (atomic fraction), with which the corresponding alloy, both as-cast and annealed, shows a high discharge capacity over 310 mA.h/g. If more Ti is added, a greatly decreased discharge capacity will be received with only a little increase of better cycle stability. |
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| Keywords: | hydrogen storage alloy titanium phase structure electrode |
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