采用真空快淬法研究制备了富铈稀土系低温贮氢合金,考察了3种不同组成合金的放电性能.结果表明,Mm(NiCoAlMn)_(4.95)舍金大电流放电性能较好;添加微量元素后,可以2提高其0.7C放电比容量、放电平台以及改善循环性能.经循环伏安性能测试发现,氢在合金电极中的扩散系数(D_H=3.90×10~(-8)cm~2/s)较大;XRD分析显示合金具有单一CaCu_5型相结构,晶粒尺寸小于50nm.用此合金组装的D8500型镍氢电池在-40℃、0.2C电流条件下,放电容量达到常温放电容量的70.72%.以1C电流充放电400次,电池容量保持率为93%,完全满足低温镍氢电池的要求.
The Mm rare earth hydrogen storage alloy is synthesized by vacuum rapid quenching method. And three different alloys are studied. The results show that the alloy of Mm(NiCoAlMn)_(4.95) has better large-current discharging performance. And its electrochemical properties, such discharge capacity, discharge voltage platform, cyclic life as well, are improved obviously. The bigger hydrogen coefficient(D_H= 3.90×10~(-8) cm~2/s)of alloy electrode is obtained by cyclic voltammetry. While the single CaCu_5-type phase structure of the alloy is determined by XRD, and its small grain size is less than 50nm. Then, the discharge capacity of D8500 Ni/MH battery, the alloy as material, can reach 70.72% of normal atmospheric temperature capacity at -40℃ by 0.2C. Moreover, the cell after 400 cycles at 1C, the capacity still has 93%, which satisfies the need of battery at low temperature.
参考文献
| [1] | 陈人杰,李丽,吴锋,邱新平,陈实.低温对储氢合金及电解液性能的影响[J].矿冶工程,2007(02):44-46. |
| [2] | 郭红霞,曹美丽,陈迅,张宝增,张进峰.金属氢化物-镍蓄电池低温性能的研究[J].河南师范大学学报(自然科学版),2003(02):76-78. |
| [3] | 叶辉,李志林,吴铸,张宏.高功率型和低温型镍氢电池用掺硼贮氢合金的研究[J].功能材料与器件学报,2002(02):139-143. |
| [4] | Lu Yanjing;Zhu Lei;Cheng Yan et al.Low-temperature performance and high-rate discharge capability of AB_5-type non-stoichiometric hydrogen storage alloy[J].Transactions of Nonferrous Metals Society of China,2007,17(A02):978. |
| [5] | 陶明大,陈云贵,吴朝玲,付春艳,涂铭旌.Low-Temperature Hydrogen Storage Alloy and Its Application in Ni-MH Battery[J].稀土学报（英文版）,2004(06):882-886. |
| [6] | 张宏;叶辉 .高功率Ni/MH电池用憾型负极储氢合金的研究[J].中国科学院研究生院学报,2003,20(03):381. |
| [7] | 张羊换,陈梅艳,王新林,李平,李蓉,林玉芳.Cu对高淬速AB5型贮氢合金电化学性能的影响[J].包头钢铁学院学报,2002(02):154-158. |
| [8] | 张羊换,陈梅艳,王新林,王国清,林玉芳,郭世海.硼对Mm（Ni,Co,Mn,Al）5贮氢合金性能的影响[J].电池,2004(03):161-163. |
| [9] | 谭飞鹏,王芳斌,唐有根,许谷芽.硼掺杂对稀土贮氢合金相结构和电化学性能的影响[J].合成化学,2007(z1):191-194. |
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