Microstructural and spectroscopic investigations into the effect of CeO₂ additions on the performance of a MnO₂ aqueous rechargeable battery

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• 作者：Manickam Minakshi ; David R.G. Mitchell ; Melody L. Carter ; Dominique Appadoo ; Kalaiselvi Nallathamby
• 关键词：Cerium oxide ; Manganese dioxide ; Additive ; LiOH ; TEM ; EELS ; IR
• 刊名：Electrochimica Acta
• 出版年：2009
• 出版时间：30 April 2009
• 年：2009
• 卷：54
• 期：12
• 页码：3244-3249
• 全文大小：1181 K

文摘

The influence of CeO₂ additions on the electrochemical behaviour of the MnO₂ cathode in a Zn–MnO₂ battery using lithium hydroxide (LiOH) as an electrolyte is investigated using microscopy and spectroscopic techniques. The results showed that such additions greatly improve the discharge capacity of the battery (from 155 to 190 mAh g⁻¹) but only from the second discharge cycle onwards. Capacity fade with subsequent cycling is also greatly reduced. With an aim to understand the role of CeO₂ on the discharge–charge characteristics of MnO₂ and its mechanism, we have used a range of microscopy, spectroscopy and diffraction-based techniques to study the process. The CeO₂ is not modified by multiple discharged and charged cycles. The CeO₂ may enhance the discharge–charge performance of the battery by raising the oxygen evolution potential during charging but does not take part directly in the redox reaction.