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Zr替代La對快淬態(tài)A2B7型電極合金結(jié)構(gòu)及電化學性能的影響
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Influences of Substitution of Zr for La on Structures and Electrochemical Performances of A2B7-Type Electrode Alloys by Melt-Spinning
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“863” Program (2006AA05Z132); National Natural Science Foundations of China (50871050 and 50701011); Natural Science Foundation of Inner Mongolia, China (200711020703) and High Education Science Research Project of Inner Mongolia, China (NJzy08071)

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    摘要:

    用鑄造及快淬工藝制備了A2B7型電極合金，合金的名義成分為La0.75-xZrxMg0.25Ni3.2Co0.2Al0.1 (x = 0, 0.05, 0.1, 0.15, 0.2)。深入研究了Zr替代La對合金微觀結(jié)構(gòu)及電化學性能的影響。用XRD、SEM、TEM分析了合金的結(jié)構(gòu)。結(jié)果表明，鑄態(tài)及快淬態(tài)合金均具有多相結(jié)構(gòu)，含有兩個主相(La,Mg)Ni3和LaNi5以及一個殘余相LaNi2。Zr替代La使合金中LaNi5相明顯增加，并促進快淬態(tài)合金中形成非晶相。電化學測試的結(jié)果表明，Zr替代La明顯降低合金的放電容量，但顯著改善合金的電化學循環(huán)穩(wěn)定性。當Zr含量小于0.1時，合金的放電容量隨淬速的增加而先增加后減小，合金的循環(huán)穩(wěn)定性隨淬速的增加而單調(diào)增加。

    Abstract:

    A2B7-type electrode alloys with a nominal composition of La0.75-xZrxMg0.25Ni3.2Co0.2Al0.1 (x = 0, 0.05, 0.1, 0.15, 0.2) were prepared by casting and melt-spinning. The influences of the substitution of Zr for La on the structures as well as the electrochemical performances of the alloys were investigated. The results obtained by XRD, SEM and TEM show that the as-cast and spun alloys have a multiphase structure, consisting of two main phases (La,Mg)Ni3 and LaNi5 as well as a residual phase LaNi2. The substitution of Zr for La leads to an obvious increase of the LaNi5 phase in the alloys, and it also helps the formation of a like amorphous structure in the as-spun alloy. The results of the electrochemical measurements indicate that the substitution of Zr for La obviously decreases the discharge capacity of the as-cast and spun alloys, but significantly improves their cycle stability. With increasing the spinning rate, the discharge capacity of the alloys (x≤0.1) first increases and then decreases, while the cycle stability monotonously rises.

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張羊換,趙棟梁,郭世海,祁 焱,王青春,王新林. Zr替代La對快淬態(tài)A2B7型電極合金結(jié)構(gòu)及電化學性能的影響[J].稀有金屬材料與工程,2010,39(7):1141~1146.[Zhang Yanghuan, Zhao Dongliang, Guo Shihai, Qi Yan, Wang Qingchun, Wang Xinlin. Influences of Substitution of Zr for La on Structures and Electrochemical Performances of A2B7-Type Electrode Alloys by Melt-Spinning[J]. Rare Metal Materials and Engineering,2010,39(7):1141~1146.]
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  • 收稿日期:2009-06-17
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