摘要
采用X射线衍射(XRD)分析,充放电测试,线性极化和电位阶跃等方法研究了在750,850,950℃3个不同温度下进行固相烧结对TiNi储氢合金的相结构和电化学性能的影响。结果表明:随着烧结温度的提高,TiNi合金最大放电容量由179.0 mAh.g-1增加到188.1和211.3 mAh.g-1。虽然温度的升高并没有提高合金的交换电流密度,但却大大增强了氢在合金中的扩散速率,扩散系数D从750℃的2.49×10-10cm2.s-1增加到850℃的2.61×10-10cm2.s-1和950℃的3.48×10-10cm2.s-1,从而显著的改善了合金电极的高倍率放电性能(HRD)。950℃烧结后的合金在1500 mA.g-1的放电电流下仍然可以放出84.6 mAh.g-1的电量。
The structure and electrochemical properties of TiNi hydrogen storage alloys,prepared by solid phase sintering at 750,850 or 950 ℃,were investigated by using X-ray diffraction(XRD),charge and discharge testing,linear polarization,and potential-step measurement.The results showed that the maximum discharge capacity increased from 179.0 to 188.1 and 211.3 mAh·g-1 with the increase of the sintering temperature.Although the increase of the sintering temperature lead to a decrease in exchange current density,hyd...
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2010年第3期331-335,共5页
Chinese Journal of Rare Metals
关键词
储氢合金
TINI合金
固相烧结
电化学性能
hydrogen storage alloy
TiNi alloy
solid phase sintering
electrochemical property
