摘要
采用快淬工艺可明显提高合金的综合性能特别是合金的循环稳定性，因而与快淬技术相关的研究如纲米晶贮氢材料等越天越显元出其实用价值，采用快淬工艺制备的ＭｍＮｉ３．８Ｃｏ０．６Ｍｎ０．５５Ｔｉ０．０５贮氢合金的室温（２５℃）下的电化学性能及其结构已有报道，但还没有刘其温度特性进行研究。本文应用单辊法制备了成分为ＭｍＮｉ３．８Ｃｏ０．６Ｍｎ０．５５Ｔｉ０．０５的贮氢合金，并应用三用极法测量了该合金任不同漫度下的电化学特性，如活化速度、放电容量、高倍率放电能力以及循环稳定性。实验发现，温度对该合金的电化学性能有着非常大的影啊：温度越高，合金的活化速度越高，循环稳定性则越低；合金的放电容量随温度的升高而增大，但达到一定温度（如３５℃）后，放电容量将呈下降趋势。对温度与合金的电化学性能之间的关系也进行了理论分析。
It has been reported that the synthetic properties of AB5-type hydrogen storage alloys can be im- proved by applying rapid quenching technique , especially the cycle stability. So , investigations related to quenching technique such as nano-crystal hydrogen storage alloys have shown more and more values of ap- plication. The electrochemical properties and structure of the melt-spun alloy with composition MmNi3.8- Co0.55 Ti0.05 have been investigated at room temperature (25℃ ) . However , the temperature characteristics of the aforesaid alloy has never been researched till now. In this paper ,the rapidly quenched alloy with compo- sition MmNi3.8 Co0.6 Mn0.55 Ti0.05 was prepared with single-roll method , and its electrochemical properties such as initial activation ,capacity ,high rate capability and cycle stability were measured with a three-elec- trode system. It was found that the effect of the temperature on the electrochemical properties was signifi- cant. The higher the temperature ,the higher the initial activation rate , the worse the cycle durability. The discharge capacity increased with the increasing temperature ,but decreased when the temperature was too high (e. g. 35℃ ) . The techanism therein was also discussed theoretically.
出处
《电源技术》
EI
CAS
CSCD
北大核心
1998年第2期68-71,共4页
Chinese Journal of Power Sources
基金
国家"863"计划资助项目
关键词
贮氢合金
负极
电化学性能
蓄电池
电池
电极
hydrogen-storage alloy , negative electrode , electrochemical property , temperature characteris- tics
