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鑄態(tài)及退火La1.9Ti0.1MgNi9合金的貯氫性能
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Hydrogen Storage Properties of As-Cast and Annealed La1.9Ti0.1MgNi9 Alloys
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the National Natural Science Foundation of China (50861003)；the Natural Science Foundation of Guangxi (2010GXNSFD013004); the Foundation of Key Laboratory of National Education Ministry for Nonferrous Metals and Materials Processing Technology (GXKFJ09-15); the Foundation of Guangxi Department of Education (200911MS07); the Foundation of Guangxi University (X081056)

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    摘要:

    采用磁懸浮感應(yīng)熔煉及退火處理的方法，制備La1.9Ti0.1MgNi9合金。對合金樣品的XRD、PCT和電化學(xué)測試表明，所有樣品均由多相組成，LaNi5相為主相。當(dāng)退火溫度達(dá)到1173 K時，合金中LaMg2Ni9相消失，Ti2Ni相出現(xiàn)。退火處理能提高合金的晶化程度、降低吸放氫平臺壓。退火1073 K合金的有效吸氫量較高，在303 K時達(dá)到1.25% (質(zhì)量分?jǐn)?shù))。La1.9Ti0.1MgNi9合金退火后，放電容量、循環(huán)穩(wěn)定性以及高倍率放電性能得到極大改善，以1173 K退火合金電化學(xué)性能較好，其最大放電容量為377 mAh/g，1100 mA/g電流密度下的高倍率放電性能為0.839，經(jīng)112次充放電循環(huán)后放電容量保持率為60%。

    Abstract:

    La1.9Ti0.1MgNi9 alloys were prepared by magnetic levitation melting followed by annealing treatments. The results of XRD, PCT and electrochemical measurements show that all samples possess a multiphase structure, and LaNi5 phase is the main phase. LaMg2Ni9 phase disappears and Ti2Ni phase appears at 1173 K. Annealed alloys exhibit higher compositional homogeneity and lower absorption/desorption plateau pressures compared to as-cast alloy. The effective hydrogen storage capacity of the alloy annealed at 1073 K is the highest, and it reaches 1.25% (mass fraction) at 303 K. Annealing not only enhances the discharge capacity, but also improves the cyclic stability and the high rate dischargeability markedly. La1.9Ti0.1MgNi9 alloy annealed at 1173 K presents good electrochemical performance with the maximum discharge capacity of 377 mAh/g, the HRD1100 of 0.839 and the retention of discharge capacity of 60% after 112 charge/discharge cycles.

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蔣衛(wèi)卿,周正誠,黃春玉,藍(lán)志強,郭 進(jìn).鑄態(tài)及退火La1.9Ti0.1MgNi9合金的貯氫性能[J].稀有金屬材料與工程,2010,39(11):1888~1892.[Jiang Weiqing, Zhou Zhengcheng, Huang Chunyu, Lan Zhiqiang, Guo Jin. Hydrogen Storage Properties of As-Cast and Annealed La1.9Ti0.1MgNi9 Alloys[J]. Rare Metal Materials and Engineering,2010,39(11):1888~1892.]
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  • 收稿日期:2009-11-26
  • 最后修改日期:2010-09-28
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