| Cr对V2.1TiNi0.3贮氢合金结构和电化学性能的影响 |
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| 引用本文： | 宋茂成,张荣华,张雪峰,赵朝勇,崔旭梅,刘甜甜,同艳维,庞立娟,邓刚.Cr对V2.1TiNi0.3贮氢合金结构和电化学性能的影响[J].无机化学学报,2016,32(6):975-982. |
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| 作者姓名： | 宋茂成 张荣华 张雪峰 赵朝勇 崔旭梅 刘甜甜 同艳维 庞立娟 邓刚 |
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| 作者单位： | 西华大学材料科学与工程学院, 成都 610039;攀枝花学院材料工程学院, 攀枝花 617000,西华大学材料科学与工程学院, 成都 610039;攀枝花学院材料工程学院, 攀枝花 617000,攀枝花学院材料工程学院, 攀枝花 617000,攀枝花学院材料工程学院, 攀枝花 617000,攀枝花学院材料工程学院, 攀枝花 617000,西华大学材料科学与工程学院, 成都 610039;攀枝花学院材料工程学院, 攀枝花 617000,攀枝花学院生物与化学工程学院, 攀枝花 617000,攀枝花学院材料工程学院, 攀枝花 617000,攀枝花学院材料工程学院, 攀枝花 617000 |
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| 基金项目： | 四川省科技支撑计划项目(No.2012GZX0089)和四川省科技创新研究团队建设项目(No.2015TD0008)资助。 |
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| 摘 要： | 研究了Cr添加量对V_(2.1)Ti Ni_(0.3)Crx(x=0,0.2,0.4,0.6)贮氢合金的结构和电化学性能的影响。结果表明,所有合金均由V基固溶体主相和Ti Ni基第二相组成,且第二相呈网状分布在晶界上,部分呈颗粒状分布于合金主相之中。随着Cr含量增大,合金主相的晶胞体积与合金电极的最大放电容量逐渐减小,而循环稳定性逐渐增加,同时合金电极的动力学性能得到改善。在合金中添加Cr使合金电极的活化性能变差,但添加量的进一步增多对其活化性能影响不大。综合考虑,V_(2.1)Ti Ni_(0.3)Cr_(0.4)合金的电化学性能最好,最大放电容量可达442.20 m Ah·g~(-1),20次充放电循环后容量保持率达81.91%。
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| 关 键 词： | 钒基贮氢合金 镍氢电池 Cr添加 显微结构 电化学性能 |
| 收稿时间： | 2015/10/1 0:00:00 |
| 修稿时间： | 2015/10/1 0:00:00 |
Effect of Chromium Addition on Microstructures and Electrochemical Properties of V2.1TiNi0.3 Alloy |
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| SONG Mao-Cheng,ZHANG Rong-Hu,ZHANG Xue-Feng,ZHAO Chao-Yong,CUI Xu-Mei,LIU Tian-Tian,TONG Yan-Wei,PANG Li-Juan and DENG Gang.Effect of Chromium Addition on Microstructures and Electrochemical Properties of V2.1TiNi0.3 Alloy[J].Chinese Journal of Inorganic Chemistry,2016,32(6):975-982. |
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| Authors: | SONG Mao-Cheng ZHANG Rong-Hu ZHANG Xue-Feng ZHAO Chao-Yong CUI Xu-Mei LIU Tian-Tian TONG Yan-Wei PANG Li-Juan and DENG Gang |
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| Institution: | College of Materials Science and Engineering, Xihua University, Chengdu 610039, China;College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China,College of Materials Science and Engineering, Xihua University, Chengdu 610039, China;College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China,College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China,College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China,College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China,College of Materials Science and Engineering, Xihua University, Chengdu 610039, China;College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China,College of Biological and Chemical Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China,College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China and College of Materials Engineering, Panzhihua University, Panzhihua, Sichuan 617000, China |
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| Abstract: | The microstructures and electrochemical properties of the V2.1TiNi0.3Crx (x=0, 0.2, 0.4, 0.6) hydrogen storage electrode alloys were investigated. The results showed that all of the alloys were consisted of the V-based solid solution main phase with a body centered cubic (bcc) structure and the TiNi-based secondary phases. The secondary phases were mainly in the grain boundaries with network distribution, and some of the secondary phase particles were distributed in the main phase. The cell volumes of the main phase and the maximum discharge capacity of the alloy electrodes decreased with the increase of Chromium (Cr) content, while the cycle stability of the alloy electrodes was gradually increased. At the same time, the kinetic performance of the alloy electrodes improved. The activation performance of the alloy electrodes deteriorated when the Chromium element was added, but further increase of Cr content did not change the activation performance significantly. The V2.1TiNi0.3Cr0.4 alloy showed the best electrochemical properties among the investigated alloys. Its maximum discharge capacity reached 442.20 mAh·g-1, and its capacity retention ratio after 20 cycles was 81.91%. |
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| Keywords: | V-based hydrogen storage alloy Ni-MH battery Cr addition microstructure electrochemical property |
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