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Microstructural Transformation and Electrochemical Properties of Mg-Ni-Y-La Amorphous Alloy
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Microstructural Transformation and Electrochemical Properties of Mg-Ni-Y-La Amorphous Alloy
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National Natural Science Foundation of China (50972066)

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    摘要:

    采用銅模噴鑄法制備了Mg60Ni23.6Y0.5La15.9塊體非晶合金，并對(duì)其微觀組織結(jié)構(gòu)及電化學(xué)性能進(jìn)行了研究。用XRD和SEM對(duì)Mg60Ni23.6Y0.5La15.9非晶合金在充放電過程中的微觀結(jié)構(gòu)進(jìn)行分析。采用自動(dòng)充放電測試系統(tǒng)對(duì)Mg60Ni23.6Y0.5La15.9非晶合金電化學(xué)性能進(jìn)行了測試。結(jié)果表明：在吸氫放氫過程中合金的非晶態(tài)結(jié)構(gòu)逐步轉(zhuǎn)變?yōu)榫B(tài)，并且隨著循環(huán)的進(jìn)行逐漸形成了Mg2NiH4、Mg2Ni和Mg(OH)2相。電化學(xué)性能測試結(jié)果表明：Mg60Ni23.6Y0.5La15.9非晶合金電極的放電容量變化過程可以分為4個(gè)階段，其最大放電容量達(dá)到410.5 mAh/g，從而說明非晶結(jié)構(gòu)有可能是非晶電極達(dá)到最大放電容量的關(guān)鍵因素

    Abstract:

    The bulk amorphous alloy Mg60Ni23.6Y0.5La15.9 was prepared by copper-mold inject casting. Its microstructural transformation and electrochemical properties were investigated. The microstructures of Mg60Ni23.6Y0.5La15.9 amorphous alloy during charge and discharge cycling were characterized by XRD and SEM. The electrochemical performances of the alloy were tested by an automatic charge and discharge apparatus. The results show that the amorphous structure transforms into crystallized one step by step and Mg2NiH4, Mg2Ni and Mg(OH)2 phases are formed gradually during the process of hydrogenation and dehydrogenation. Furthermore, the result of electrochemical characteristics testing shows that the change process of discharge capacity for Mg60Ni23.6Y0.5La15.9 amorphous alloy can be divided into four stages and the highest discharge capacity reaches 410.5 mAh/g. It is found that the amorphous structure may be a critical factor to obtain the maximum discharge capacity.

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任雯羨,李雙壽,林萬明,劉春蓮,楊廣林. Microstructural Transformation and Electrochemical Properties of Mg-Ni-Y-La Amorphous Alloy[J].稀有金屬材料與工程,2015,44(4):854~858.[Ren Wenxian, Li Shuangshou, Lin Wanming, Liu Chunlian, Yang Guanglin. Microstructural Transformation and Electrochemical Properties of Mg-Ni-Y-La Amorphous Alloy[J]. Rare Metal Materials and Engineering,2015,44(4):854~858.]
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  • 收稿日期:2014-04-11
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  • 在線發(fā)布日期: 2015-06-08
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