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化学学报
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化学学报 ›› 2004, Vol. 62 ›› Issue (23): 2355-2360. 上一篇    下一篇

研究简报

纳米钙钛矿型Ca1-xBixMnO3-δ的合成及其作为可充碱性电池阴极材料的可行性研究

夏熙1, 李学琴1, 崔静洁1, 刘洪涛2   

  1. 1. 新疆大学化学化工学院应用化学研究所, 乌鲁木齐, 830046;
    2. 中国科学院长春应用化学研究所电分析化学国家重点实验室, 长春, 130022
  • 投稿日期:2003-08-28 修回日期:2004-07-14 发布日期:2014-02-17
  • 通讯作者: 夏熙,E-mail:xxia@xju.edu.cn;刘洪涛,E-mail:liuht@ciac.jl.cn E-mail:xxia@xju.edu.cn;liuht@ciac.jl.cn
  • 基金资助:
    国家自然科学基金(No.29963002)资助项目.

Preparation of Nanophase Perovskite-type Ca1-xBixMnO3-δ and Its Feasibility as a Cathode Material in Alkaline Secondary Batteries

XIA Xi1, LI Xue-Qin1, CUI Jing-Jie1, LIU Hong-Tao2   

  1. 1. Institute of Applied Chemistry, Xinjiang University, Urumqi 830046;
    2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
  • Received:2003-08-28 Revised:2004-07-14 Published:2014-02-17

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采用共沉淀合成法制备了Bi不同取代量的纳米Ca1-xBixMnO3-δ,其中烧结温度由TG-DTA测试确定.用原子吸收对其进行了分组分析,采用XRD,TEM对其结构和晶粒的大小及形貌进行了分析,并与高温固相法和硬脂酸法制备样品进行比较.结果表明,Bi取代量的不同,所得样品的物相也随之发生变化.但不同制备方法所得样品的物相相同,晶粒的平均粒径不同,但均属纳米级.当在碱性溶液(9 mol/L KOH)中进行充放电性能测试时发现,取代量x=0.l时Ca1-xBixMnO3-δ的放电容量为380 mAh/g,与同等条件下国际一号样(MnO2)的放电容量248 mAh/g相比,提高了53%.在充放电实验中,电极的可充性能比国际一号样及无取代的CaMnO3-δ有很大的提高.因此有希望作为可充电池阴极的活性材料.本文还利用循环伏安方法对其充放电机理进行了初步讨论.

关键词: 钙钛矿型Ca1-xBixMnO3-δ, 纳米粒子, 阴极材料, 放电容量, 充放电机理

A series of perovskite-type composite oxides Ca1-xBixMnO3-δ with different substituted Bi amount were synthesized by co-deposition method.The composition and structure of this obtained product was analyzed and characterized through XRD, AAS and TEM.The results showed that the Ca1-xBixMnO3-δ was just Perovskite-type while its crystal form changed with the substitute amount x of Bi.All the prepared samples were nanoparticles.The Ca1-xBixMnO3-δ showed a remarkable electrochemical activities.The discharge capacity of the Ca1-xBixMnO3-δ as the cathode material used in alkaline electrolyte solution arrives 380 mAh/g, which is 53% more than that of the international common sample No.1 (ICNo.1 MnO2).The CV and EIS techniques were adopted to explain the improving electrochemistry of the perovskite-type Ca0.9Bi0.1MnO3-δ.The double-exchange mechanism of charge carriers might be exployed to tackle it.

Key words: perovskite-type Ca1-xBixMnO3-δ, nanoparticle, cathode material, discharge capacity, double-exchange mechanism