(1. 洛陽工學(xué)院 材料工程系, 洛陽 471039;
2. 四川大學(xué) 金屬材料系, 成都 610065)
摘 要: 研究了化學(xué)配比x 對(duì)貯氫合金Ml(Ni0.71 Co0.15 Al0.06 Mn0.08)x(4.6≤x ≤5.2)的結(jié)構(gòu)、 組織、 電化學(xué)性能和 pcT 特性的影響。 結(jié)果表明, 隨著x 增大非化學(xué)計(jì)量比合金點(diǎn)陣常數(shù) a 值減小, c 值增大, 單胞體積減小, 當(dāng)x =5.2時(shí) c/a 達(dá)到最大值。 x =5.0的化學(xué)計(jì)量比合金具有最小的點(diǎn)陣常數(shù)和單胞體積。放電容量、 充放電循環(huán)穩(wěn)定性和 pcT 曲線平臺(tái)壓均隨著x 增大而提高, 當(dāng)x =5.2時(shí)達(dá)到最大放電容量和最佳循環(huán)穩(wěn)定性。
關(guān)鍵字: 貯氫合金; 金屬氫化物電極;稀土合金; 電化學(xué)性能
(1. Department of Material Engineering,Luoyang Institute of Technology, Luoyang 471039, P.R.China;
2. Department of Metal Materials, Sichuan University, Chengdu 610065, P.R.China)
Abstract:Effect of stoichiometry on phase structures, electrochemical properties and pcT characteristics of Ml(Ni0.71Co0.15 Al0.06Mn0.08)x (Ml=lanthanumrich michmetal, 4.6≤ x ≤5.2) alloys have been investigated. The lattice constants a, c , and cell volumes of nonstoichiometric alloys are bigger than those of the stoichiometric alloy. The value of a decreases, the values of c andcell volume increase with increasing value of x except for those of the stoichiometric alloy. The plateau pressure of pcT curve, discharge capacities and cycling stability all increase with increasing value of x . The alloy with x =5.2 hasthehighest discharge capacity and the best cycling stability among the studied alloys.
Key words: hydrogen storage alloy; metal hydride electrode; rare earth alloy; electrochemical property


