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無鈷LaNi4.1Al0.3Mn0.4Si0.2Fex (x=0~0.4)儲(chǔ)氫合金性能
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Properties of Co-Free LaNi4.1Al0.3Mn0.4Si0.2Fex (x=0~0.4) Hydrogen Storage Alloys
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    摘要:

    采用電弧熔煉制備LaNi4.1Al0.3Mn0.4Si0.2Fex(x=0~0.4)儲(chǔ)氫合金,借助XRD、SEM等分析LaNi4.1Al0.3Mn0.4Si0.2Fex合金的晶體結(jié)構(gòu)和相組成,并研究合金的電化學(xué)性能。結(jié)果表明:合金主要由LaNi5單相組成,當(dāng)x≥0.1時(shí),在LaNi5主相上分布著些許灰色的第二相。隨著LaNi4.1Al0.3Mn0.4Si0.2Fex(x=0~0.4)合金中Fe的加入量增加,合金最大放電容量由295.4 mAh/g(x=0)降低到278.2 mAh/g(x=0.4),活化次數(shù)也由10次增加到18次。同時(shí)合金200次循環(huán)后的容量保持率卻由66.85%(x=0)提高到93.33%(x=0.4)。

    Abstract:

    LaNi4.1Al0.3Mn0.4Si0.2Fex (x=0~0.4) hydrogen storage alloys were prepared by inductive melting. The crystal structure and phase composition of alloys were determined by XRD and SEM, and the electrochemical properties were also investigated. The results show that the alloys are composed of LaNi5 as main phase. When x≥0.1, some grey secondary phases are distributed on the main LaNi5 phase. With the increase of Fe content, the maximum discharge capacity decreases from 295.4 mAh/g (x=0) to 278.2 mAh/g (x=0.4), and the activity times increase from 10 to 18. Meanwhile the capacity retention rate increases from 66.85% (x=0) to 93.33% (x=0.4) after the charge/discharge cycle of 200 times.

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馬小波,吳怡芳,柳永寧,陳元振,李成山.無鈷LaNi4.1Al0.3Mn0.4Si0.2Fex (x=0~0.4)儲(chǔ)氫合金性能[J].稀有金屬材料與工程,2013,42(6):1287~1290.[Ma Xiaobo, Wu Yifang, Liu Yongning, Chen Yuanzhen, Li Chengshan. Properties of Co-Free LaNi4.1Al0.3Mn0.4Si0.2Fex (x=0~0.4) Hydrogen Storage Alloys[J]. Rare Metal Materials and Engineering,2013,42(6):1287~1290.]
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  • 收稿日期:2012-06-10
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