Co-free cathode: A facile strategy to greatly improve the electrochemical reversibility of cobalt-free cathode material by doping Al. This work not only provides a fundamental insight into redefining the Ni-rich Co-free cathode material, b...
Enhanced Zn2+ Transport in Ionic Liquid Electrolyte by Hydrofluoroether Dilution for High‐Power and Long‐Life Zn/Graphite Cells
Von Wiley-VCH zur Verfügung gestellt
Higher Zn2+ mobility: A hydrofluoroether diluent is introduced into Zn-based ionic liquid electrolyte to break down the larger ionic aggregates into smaller ones with enhanced Zn2+ mobility, which improves the rate capability and cycling performance of Zn/graphite dual ion batteries.
Ionic liquid (IL) electrolytes have been widely used in high-voltage Li-based dual ion batteries (DIBs) due to their strong resistance against oxidation. However, their applications in Zn-based DIBs are restricted because the high charge density of divalent Zn2+ aggravates the ionic interactions in ionic networks and leads to insufficient Zn2+ mobility. Herein, we introduce a hydrofluoroether diluent into a Zn-based IL electrolyte to break down the larger ionic aggregates into smaller ones with weakened ionic interactions. This unique solvation structure reduces the Stokes radius of Zn2+ from 1.3 nm to 0.97 nm and increases its diffusion coefficient by ∼30 times while retaining the high oxidation stability, enabling the charge/discharge cycling of Zn/graphite DIBs at a high rate of 20 C. Moreover, the enhanced mobility of Zn2+ also promotes compact Zn deposition, which allows the operation of anode-free Zn/graphite DIBs with 90 % capacity retention after 100 cycles.Zum Volltext
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