研制了5个LaNi5型贮氢合金试样,分别对5种合金试样电极的电化学放电容量、高倍率充放电和宽温度范围内充放电性能、循环稳定性及其相结构进行了测试和分析.结果表明:Sn及Si的搀杂增加了合金的非化学计量比,稳定了合金的循环稳定性并改善了合金的高倍率充放性能;合金样(Ml0.90Nd0.10)Ni3.60Co0.50Mn0.40Al0.18Si0.42的容量较高,5C充电效率大于95%,5C放电效率大于90%,400次充放循环后容量保持率大于70%;所设计合金晶型均为CaCu5相,充放电循环后合金主相仍是CaCu5相,同时发生氧化和粉化现象.
Five LaNi5-type hydrogen storage alloys were prepared. Their electrodes' discharge capacity,high rate charge-discharge ability, temperature effect,crystal structure and cycling stability were investigated. The XRD results indicated that alloys examined in this work seem to be of single phase with the hexagonal CaCu5-type crystal structure. After 400 charge-discharge cycles, the same crystal structure remained, for some of oxides, for instance, Mm(OH)3 and La(OH)3;The composition of stannum or silicon stabilizes the cycle life and improves the high rate charge-discharge abilities of their electrodes;The electrochemical capacity of sample (Ml0.90Nd0.10)Ni3.60Co0.50Mn0.40Al0.18Si0.42 is above 290.72 mAh.g-1, with capacity preserving being above 70% after 400 chargedischarge cycles. Its 5C rate charge efficiency is higher than 95%,and 5C rate discharge efficiency higher than 90%. It also performs well at various operating temperatures.
参考文献
| [1] | 吴伯荣.电动车用MH-Ni动力电池[J].电源技术,2000(01):45-48,56. |
| [2] | 江建军.氢化物-空气半燃料电池用贮氢合金电极的烧结制备及其电化学特性[J].稀有金属材料与工程,2003(03):201-204. |
| [3] | Maurel F.;Knosp B. .Characterization of Corrosion Products of Ab_5-Type Hydrogen Storage Alloys for Nickel-Metal Hydride Batteries[J].Journal of the Electrochemical Society,2000(2):78-86. |
| [4] | Cocciantelli J M;Bernard P;Fernandez S et al.The Influence of Co and Various Additives on the Performance of MmNi4.3-xMn0.33-Al0.4Cox[J].Journal of Alloys and Compounds,1997,253-254:642-647. |
| [5] | 郭生武,张勇,张中平,柳永宁.掺硅MlNi5系稀土贮氢合金电化学性能[J].中国稀土学报,2000(04):325-328. |
| [6] | JENSEN J O;Bjerrum N J .Systematic B-metal Substitution in CaNi5[J].Journal of Alloys and Compounds,1999,293-295:185-189. |
| [7] | 李全安,桑革,李建文,陈云贵,涂铭旌.非化学计量比贮氢合金Ml（Ni0.71Co0.15Al0.06Mn0.08）x的电化学性能[J].中国有色金属学报,2000(05):659. |
| [8] | Tadashi Ise;Takeo Hamamatsu;Teruhiko Imoto .Improved rapidly-quenched hydrogen-absorbing alloys for development of improved-capacity nickel metal hydride batteries[J].Journal of Power Sources,2001(1/2):81-87. |
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