Abstract
The effects of small amounts of added elements such as aluminum, titanium and zirconium to MlNi3.8(CoMn)1.2 on its electrochemical performances and performances at high temperatures were investigated. It is found that the addition of aluminum brings about a significant, increase in the discharge capacity at high temperatures, and the capacity decay, during repeated charge-discharge cycles and the self-discharge are both suppressed, while the rate capability decreases. The alloy containing zirconium exhibits a longer cycle life and a better rate capability, but a much lower discharge capacity. The addition of titanium improves the rate capability, but the capacity decreases greatly. An X-ray diffraction analysis indicates that a second phase exists in the alloy with additive Zr or Ti, which improves the discharge-rate characteristics, and the superior stability of the alloy with additive Al may be due to the expansion of lattice parameters and cell volume.
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LI Zhi-zun: Born in 1971
The project is financially supported by the Science Research Foundation of Ordnance Engineering College (No. yjjxm0006).
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Zhi-zun, L., Yong-quan, L. & Feng-qi, H. Influence of doped elements on electrochemical high temperature performance of La-riched hydrogen storage material. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 18, 25–28 (2003). https://doi.org/10.1007/BF02838794
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DOI: https://doi.org/10.1007/BF02838794