采用优化稀土成分并添加适量的硼改善AB5型贮氢合金的低温性能 .实验表明 ,含富Ce稀土及添加适量硼的AB5型合金 ,其低温电化学性能优良 ,能满足Ni/MH电池在低至 - 35℃小倍率电流密度放电的要求 .贮氢合金低温性能的改善与合金的微结构、热力学和动力学性能相一致
Optimizing the rare earth composition and doping with boron have been used to improve the low temperature performance of AB 5 hydrogen storage alloy.The results show that Ce-rich alloy with a proper amount of boron is suitable for Ni/MH battery with the lower-limit temperature down to 238 K under smaller current density (120 mA/g). The improvement of low temperature performance of hydrogen storage alloy is well consistent with its microstructure,thermodynamic and kinetic properties.
[1] RFNelson.Powerrequirementsforbatteriesinhybridelectricvehicles[J].J .PowerSources,2000,91:2.
[2] KErbacher.Anenvironmentalaircraftbattery(EAB)[J].J .PowerSources,1999,80:265.
[3] HYe,ZLLi,ZWu,etal.Studyofthelow_temperatureelectrochemicalperformancesofhydrogenstorageal loy[C].HangZhou:Proceedingsofthe3rdChineseHydrogenEnergySymposium,2001.127.
[4] YeH ,ZhangH .Developmentofhydrogenstoragealloysforhigh_powerNickel_Metalhydridebatteries[J].AdvanceEngineeringMaterials,2001,3:481.
[5] YeH ,ZhangH ,WQ .Wu,etal.InfluenceoftheBoronadditiveonthestructure,thermodynamicsandelec trochemicalpropertiesoftheMmNi3.55Co0.75Mn0.4Al0.3 hydrogenstorageAlloy[J].J .AlloysComp.,2000,312:68.
[6] YeH ,ZhangH .ImprovementofthelowtemperatureperformancesofMmNi3.55Co0.75Mn0.4Al0.3 hydrogenstoragealloy[J].J.ElectrochemicalSoc.,2002,149:A122_A126.