热处理温度对储氢合金高倍率放电性能的影响  

Effect of Heat Treatment Temperature on the High Rate Dischargeability of Hydrogen Storage Alloy

作　　者：王琳瑛[1] 丁毅[1] 杨猛[1] 赵相玉[1] 马立群[1] 

机构地区：[1]南京工业大学材料科学与工程学院,南京210009

出　　处：《武汉理工大学学报》2008年第9期28-31,35,共5页Journal of Wuhan University of Technology

摘　　要：研究了不同温度下的热处理对MLNi3.8Co0.75Mn0.4Al0.2储氢合金高倍率放电性能的影响。XRD测试结果表明热处理之后合金结晶度增加。电化学性能测试结果表明热处理明显改善了储氢合金电极的高倍率放电性能,在900mA/g的放电电流下,经热处理的储氢合金电极的高倍率放电能力(HRD)均在80%以上,而原始合金电极在相同的放电条件下却不能放电。经过热处理提高了电极的交换电流密度,降低了电极的极化电阻,改善了电极在放电过程中的去极化作用。热处理温度在673 K时合金电极的交换电流密度最高,极化电阻值最低,高倍率放电性能最好。The effects of different heat treatment temperature on the high rate discharge ability of MLNi3.8 Co0. 75 Mno. 4 Al0.2 hydrogen storage alloy were investigated. XRD pattern showed the alloy lattice volume had enlarged after heat treatment. The result of electrochemistry testing showed that the high rate discharge ability （HRD） of MLNi3.8 Co0.75 Mn0.4 Al0.2 hydrogen storage alloy was obviously improved after heat treatment. And the HRD of the heat-treatment hydrogen storage alloy electrode remained over 80 % under the 900 mA/g discharge conditions while the original hydrogen storage alloy electrode cannot discharge. After heat treatment, the exchange current density increased and the polarization resistance reduced. The electrode depolarization of the alloy was improved in the discharge process. With a 673 K of heat treatment, the exchange current and the high rate discharge ability of the hydrogen storage alloy electrode were both the highest and the polarization resistance was the lowest among these of the treated alloys.

关 键 词：储氢合金 热处理 高倍率放电性能 电化学性能 

分 类 号：TG139.7[一般工业技术—材料科学与工程]