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电化学(中英文) ›› 2005, Vol. 11 ›› Issue (1): 16-19. 

• 研究论文 • 上一篇    下一篇

过渡金属二硼化物作为高容量负极的研究

王雅东,艾新平,杨汉西   

  1. 武汉大学化学与分子科学学院,武汉大学化学与分子科学学院,武汉大学化学与分子科学学院 湖北武汉430072 ,湖北武汉430072 ,湖北武汉430072
  • 收稿日期:2005-02-28 修回日期:2005-02-28 出版日期:2005-02-28 发布日期:2005-02-28

A Study of Metal Borides as High Capacity Anode Materials for Aqueous Primary Batteries

WANG Ya-dong, AI Xin-ping, YANG Han-xi~   

  1. (*)(Department of Chemistry, Wuhan University, Wuhan 430072, China
  • Received:2005-02-28 Revised:2005-02-28 Published:2005-02-28 Online:2005-02-28

摘要:  碱性溶液中,VB2和TiB2分别发生了 11电子和 6电子氧化反应,释放出 3 100mAh/g和 1 600mAh/g的超常电化学容量.对此,初步的解释是:在二硼化物中过渡金属与硼的电子转移使硼元素电负性增强,引起硼的电化学活化.使得合金的电极电势钳制在较负区域,导致某些过渡金属元素处于活化态,进而发生电化学氧化释放出电化学能量.

关键词: 二硼化物, 负极材料, 多电子反应, 高容量, 电化学活化

Abstract: The transition metal borides VB_2 and TiB_2 were tested as high capacity anode materials and their electrochemical behaviors were studied by cyclic voltammetry and discharge measurements. The experimental results indicated that transition metal borides VB_2 and TiB_2 electrodes can deliver exceptionally high discharge capacity of over 3100 mAH/g and 1 600 mAH/g respectively, corresponding to 11- and 6-electron oxidation reaction, although their parent elements V, Ti and boron, are almost completely electrochemically inert. The different electrochemical activitis were probably due to the electrochemical activation of boron, which clamp the potential to passivation for Ti and activity for V.

Key words: Diborides, Anode materials, Multi-electron reaction, Alkaline batterie

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