Synergistic polypyrrole coating and electrolyte engineering toward high-performance Zn-based batteries†
Qiufan
Wang 
*ab
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Abstract
Aqueous zinc-ion batteries (ZIBs) are hindered by anode issues including dendrite growth, hydrogen evolution, and passivation. Herein, we propose use of a polypyrrole (PPy) combined with citric acid (CA) and sodium sulfate (Na2SO4) additives to regulate Zn2+ reduction kinetics. The modified anode enables a symmetric cell to achieve stable cycling over 400 h (1 mA cm−2, 1 mA h cm−2) with low polarization voltage (45 mV). Furthermore, the assembled full cell with α-MnO2 cathodes retains a capacity of 140 mA h g−1 after 2000 cycles, demonstrating its practical viability.
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