30 Jul '18, 9am

#Jilin team improves hydrogen storage alloys to boost performance of #NiMH batteries

Nickel metal hydride (Ni-MH) batteries have key technology advantages for applications in new-energy vehicles, power tools, modern military devices etc. However, in order to compete with Li-ion batteries, their discharge capacity and cycling life need to be further improved, which are limited by the poor performances of their negative electrode materials—hydrogen storage alloys (HSAs). … In this work, a novel strategy has been proposed for designing HSAs with high capacity and long cycling life by considering the structural properties, electronegativity and surface atomic coordination states. The rationality of this strategy was verified with the density functional theory (DFT) simulations and experiment results. Following this strategy, a new AB4.5 -type HSA has been designed and fabricated by employing Mg-substitution and sub-stoichiometry, which exhibits a high capacity...

Full article: http://www.greencarcongress.com/2018/07/20180730-nimh.html

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