热处理温度对La_(0.8)Ce_(0.2)(NiCoMnAl)_5储氢合金结构与性能的影响  

Influence of Heat Treatment Temperature on the Structure and Properties of La_(0.8)Ce_(0.2)(NiCoMnAl)_5 Hydrogen Storage Alloy

作　　者：唐仁衡[1] 周顺[1] 肖方明[1] 王英[1] 孙泰[1] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院)稀有金属研究所,广州510650

出　　处：《材料导报》2014年第14期114-116,120,共4页Materials Reports

基　　金：广州市珠江科技新星专项(2011J2200033);广东省战略性新兴产业核心技术攻关项目(2011A091105001)

摘　　要：对快淬法制备的La0.8Ce0.2(NiCoMnAl)5储氢合金进行热处理,考察了热处理温度对合金的结构和性能的影响,并采用XRD、PCT、恒流充放电等测试方法对合金物相结构及性能进行表征。研究表明:热处理前后La0.8-Ce0.2(NiCoMnAl)5储氢合金均为CaCu5型相结构。热处理温度为950℃时,La0.8Ce0.2(NiCoMnAl)5合金储氢量为1.37%(质量分数),当放电电流密度为715mA/g时,合金放电比容量为307.68mAh/g,循环寿命超过300周,当放电电流密度为1200mA/g时,合金的HRD达到85.17%。The annealing process ofLa0.8Ce0.2（NiCoMnA1）5 synthesized by rapid quenching technology was studied, the effect of heat treatment temperature on the phase structures and performances were also characterized by X-ray diffraction（XRD）, pressure-composition-temperature（PCT）and constant current charge-discharge tests. The results showed that the alloys are CaCus-type phase structure before and after heat treating. After heat-treated at 950 ℃,the hydrogen storage capacity of La0.8Ce0.2 （NiCoMnA1）5 was 1. 37wt%, and its specific discharge capacity can reach 307.68 mAh/g with the life more than 300 cycles at discharge current densities of 715 mA/g. And its high-rate discharge ability （HRD）was 85.17 %at discharge current densities of 1200 mA/g.

关 键 词：镍氢电池 镧铈储氢合金 热处理温度 

分 类 号：TG139.7[一般工业技术—材料科学与工程]