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Ultrafast Zn2+ solvation dynamics unmask a hopping mechanism in eutectic battery electrolytes
Aruna K Mora1,2, Prabhat K Singh1,2
1Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India. arunm@barc.gov.in.
None:
Understanding and controlling ultrafast Zn2+ solvation in deep-eutectic electrolytes is pivotal for advancing safe, high-efficiency Zn batteries yet has remained experimentally unexplored. Two-dimensional IR spectroscopy of tunable Zn(TFSI)2-acetamide media, with thiocyanate anion (SCN-) as a vibrational probe, reveals composition-driven slowing of picosecond solvation dynamics, however, paradoxically, the slowest solvation accompanies the highest conductivity, implying a hopping-like Zn2+ migration mechanism. 2DIR measurements provide a direct molecular link between electrolyte composition and macroscopic charge transport, offering a powerful platform for rational design of high-performance Zn-ion batteries.
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