單忠強3， 馬榮駿4，翟玉春2
(1. 中國科學(xué)院 金屬研究所， 沈陽 110015;
2. 東北大學(xué) 材料與冶金學(xué)院， 沈陽 110006;
3. 國家高技術(shù)新型儲能材料工程開發(fā)中心， 中山 528437;
4. 長沙礦冶研究院， 長沙 410012)
摘 要: 研究了熔體旋淬和常規(guī)熔鑄Ml(NiCoMnAl)5貯氫合金的微結(jié)構(gòu)和電化學(xué)行為 SEM和XRD分析表明，熔體旋淬合金由細小的柱狀晶組成，它們的晶體結(jié)構(gòu)與鑄態(tài)一樣， 都為CaCu5型六方晶體結(jié)構(gòu)。電化學(xué)測試表明，旋淬態(tài)合金電極初始容量較高(>210 mA·h/g)，經(jīng)1～2次循環(huán)就可達到最大放電容量。旋淬速度為10 m/s的合金電極的放電容量(294 ]mA·h/g)稍高于鑄態(tài)合金電極的容量，所有旋淬態(tài)合金電極充放電循環(huán)穩(wěn)定性皆優(yōu)于鑄態(tài)合金。在600 mA/g電流質(zhì)量密度下，旋淬速度為10 m/s的合金電極具有較好的高倍率充放電能力，但隨著循環(huán)次數(shù)的增加，其容量穩(wěn)定性稍次于旋淬速度為25 m/s和40 m/s的合金電極。
關(guān)鍵字: 熔體旋淬； 貯氫合金電極； 電化學(xué)行為；柱晶組織
melt-spinning alloy Ml(NiCoMnAl)5
SHAN Zhong-qiang3， MA Rong-jun4
（1. Institute of Metal Research， The Chinese Academy of Sciences，
Shenyang 110015, P.R.China;
2. School of Materials and Metallurgy， Northeastern University，
Shenyang 110006, P.R.China;
3. National Engineering Development Center of HighTech EnergyStorage Materials，
Zhongshan 528437, P.R.China;
4. Changsha Institute of Mining and Metallurgy， Changsha 410012, P.R.China）
Abstract:The microstructure and electrochemical behaviors of Ml(NiCoMnAl)5 alloys prepared by both the melt-spinning method and the conventional induction melting were investigated. SEM and XRD analysis show that melt-spinning alloys are of columnar microstructure which belong to the CaCu5 type hexagonal crystal structure as same as as-cast alloy. The electrochemical measurements show that the initial capacities of melt-spinning alloy electrodes are all above 210 mA·h/g， reaching their maximum capacities after the second charge-discharge cycles. The maximum capacity (294 mA·h/g) of melt spinning (10 m/s) alloy electrodes is the same as that of as-cast alloy electrode， the stability of charge-discharge cycles of all meltspinning alloy electrodes is better than that of the as-cast alloy electrodes. When charged at 600 mA/g， the melt spinning (10 m/s) alloy electrode has better high rate discharge capability; but with the cycle number increasing， the cycle stability is less than those electrodes of melt spinning rate of 25 m/s and 40 m/s.
Key words: melt spinning； hydrogen storage alloy electrode； electrochemical behaviors； columnar structure
