摘要
测试了MmxNi3.8Co0.6Mn0.55Ti0.05(x=1.05,1,0.95)合金的充放电特性及循环寿命。当x=1.05时,合金有较高的放电容量而循环寿命略有降低,这主要归因于稀土元素有较好的吸氢特性且易在晶界处偏析,形成MmNi相。当x=0.95时,合金的放电容量及循环寿命显著降低,这是由于合金中的Mn向晶界处偏析,且极易溶于6MKOH中,破坏了合金表面,降低了放电容量和循环寿命。
The charge-discharge properties and cycle lifetime of Mm xNi 3.8 Co 0.6 Mn 0.55 Ti 0.05 compound are studied. It is found that the compound has higher electrochemical capacity and lower cycle lifetime when x=1.05. The lower cycle lifetime is due to precipitate MmNi phase at the grain boundaries during the charge-discharge cycle. The capacity and cycle lifetime decrease obviously when the Mm content x=0.95, owing to the precipitation of Mn element toward the grain boundary and dissolve in the KOH alkali solution. This dissolve destroys the grain surface, and thus results in the decrease of the cycle lifetime of the compound.
出处
《金属功能材料》
CAS
1998年第4期176-178,共3页
Metallic Functional Materials
关键词
充放电特性
循环寿命
储氢材料
稀土
贮氢合金
charge-discharge properties, cycle lifetime, hydrogen storage material