Acta Chimica Sinica ›› 2005, Vol. 63 ›› Issue (3): 229-233. Previous Articles     Next Articles

Original Articles

水溶液中掺铬层状二氧化锰可充性研究

朱新功,吴智远*,王敏,赵勇   

  1. (武汉大学化学与分子科学学院 武汉 430072)
  • 收稿日期:2004-01-31 修回日期:2004-11-05 出版日期:2005-02-14 发布日期:2010-12-10
  • 通讯作者: 吴智远

Investigation of the Rechargeability of the Cr-birnessite in Aqueous Solution

ZHU Xin-Gong,WU Zhi-Yuan*,WANG Min,ZHAO Yong   

  1. (College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072)
  • Received:2004-01-31 Revised:2004-11-05 Online:2005-02-14 Published:2010-12-10
  • Contact: WU Zhi-Yuan

The Cr-birnessite was prepared by ion exchange from K-birnessite, which was synthesized by calcination of KMnO4. Measurement methods of scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), atomic absorption spectrometry (AAS), slow-scanning cyclic voltammetric and galvanostatic discharge/charge characteristics of the Cr-birnessite were applied. Potentiostatic method was used for the determination of a chemical diffusion coefficient D. XRD patterns indicate that Cr-birnessite has layered structure. Slow-scanning voltammograms exhibit single peak occurring in the range of -0.2 to 0 V on discharge and two peaks at about -0.3 and 0 V on charge. The galvanostatic discharge/charge curves indicate that the Cr-birnessite has better rechargeability at a high discharge/charge rate. Lican reversibly intercalate into and de-intercalate from the Cr-birnessite during discharge and charge. The average value of the chemical diffusion coefficient D of Li intercalated into the Cr-birnessite is 1.57×10-10cm2·s-1.

Key words: birnessite, Cr3+-doped, aqueous rechargeable battery, cycling ability, lithium intercalation