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Effects of coprecipitated manganese on the structure and electrochemical performance of Al-substituted α-nickel hydroxide

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Abstract

The effects of manganese on the structure and electrochemical performance of Al-substituted α-Ni(OH)2 prepared by a chemical co-precipitation method were studied. The results of XRD and IR showed that the Al-substituted Ni(OH)2 with various Mn contents are typical α-phase. The Mn-free sample is labile in alkaline media and partly converted to β-Ni(OH)2. The stability of the samples improves with the increase in Mn content. The results of galvanostatic charge-discharge experiments showed that the addition of Mn increases the difference between the oxygen evolution and charge potentials, which improves the charge efficiency and increases the discharge capacity. The Mn-containing samples display better cycle stability than the Ni/Al sample without Mn. The Al-substituted Ni(OH)2 sample with Mn 9.3% shows the highest discharge capacity during the whole cycle, and the largest discharge capacity is 260 mAh g−1 .The electrochemical transfer resistance (R t) value decreases with the increase of Mn content.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Approval No. 59902004). The authors also gratefully acknowledge the financial support of the Chinese State Key Laboratory for Corrosion and Protection.

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Authors and Affiliations

  1. Department of Chemistry, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    M. Y. Wu, J. M. Wang, J. Q. Zhang & C. N. Cao

  2. State Key Laboratory for Corrosion and Protection, Shenyang, 110015, People’s Republic of China

    J. Q. Zhang & C. N. Cao

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  1. M. Y. Wu
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  2. J. M. Wang
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  3. J. Q. Zhang
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  4. C. N. Cao
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Correspondence to J. M. Wang.

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Wu, M.Y., Wang, J.M., Zhang, J.Q. et al. Effects of coprecipitated manganese on the structure and electrochemical performance of Al-substituted α-nickel hydroxide. J Solid State Electrochem 10, 411–415 (2006). https://doi.org/10.1007/s10008-005-0023-9

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  • DOI: https://doi.org/10.1007/s10008-005-0023-9

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