Manipulating Zn²⁺ solvation sheath utilizing an antisolvent under high temperature conditions for high zinc anode reversibility

Aqueous zinc ion battery will be the next-generation energy storage in prospect. Nevertheless, stern parasitic reactions occur on Zn anode at high temperatures, which results in extremely poor zinc anode reversibility. Herein, innovating a trace of triethylamine (TEA) antisolvents considerably resolves foregoing problems; TEA progressively interrelates with free water and coordination water, which diminishes water activity and is conducive to the destruction of Zn2+ solvation sheath under high temperatures (80 C). Furthermore, TEA antisolvent electrolyte facilitates uniform Zn2+ deposition, lessens hydrogen evolution corrosions and eliminates side reactions as far as possible. In the hybrid antisolvent electrolyte, the symmetric Zn/Zn batteries can sustain comparatively longer cycling lifespan of 4000 h at 3 mA cm(-2), 1 mAh cm(-2) than that of 135 h without TEA antisolvent. Not only has the Coulombic efficiency made up to 99.95 % in Zn/Cu asymmetric cell over 1600 cycles as well as 94.1 % over 100 cycles at 80 C, but the Zn/MnO2 full batteries have also performed constantly for >1000 cycles, showing a 79.03 % capacity sustenance proportion when the current density reached 5 A g(-1). This work opens up a brand-new prospect for high reversible zinc anode and dendrite-free aqueous Zn ion batteries utilizing antisolvent electrolytes.