A hydrophobic phenolic polymer layer with high-flux Zn2+-specific regular channels for stabilizing aqueous zinc anodes
JOURNAL OF MATERIALS CHEMISTRY A(2024)
摘要
The persistent issues of dendrite growth and side reactions have been major obstacles hampering practical applications of aqueous zinc-ion batteries (AZBs). Herein, a porous phenolic resin (PPR) artificial protective layer integrated hydrophobic framework with regular channels is constructed on Zn foil (PPR@Zn) to stabilize the Zn anode. Experimental and theoretical calculations demonstrate that the PPR@Zn layer is endowed with the following functions: (i) Zn2+ dedicated channels of PPR provide uniform diffusion pathways for Zn2+. The high ion conductivity (7.7 mS cm(-1)) and Zn2+ transference number (0.86) prevent localized over-deposition of Zn and improve the reaction kinetics. (ii) The affinity of PPR with Zn2+ decreases the desolvation barrier of [Zn(6H(2)O)](2+) and promotes rapid and uniform Zn deposition. (iii) The repulsion of H2O molecules and SO42- anions inhibits the corrosion and side reaction. (iv) Uniform space electric fields on the anode surface mitigate the "tip effect". These synergistic effects lead to dendrite-free Zn deposition. As a result, symmetrical cells assembled with PPR@Zn demonstrate an ultra-long cycle life of 4200 h. For practical applications, pairing with an MnO2 cathode, the full cells also achieved excellent cycling stability and rate performance. This work presents a promising strategy for designing corrosion-resistant, high-stability, and reversible metal anodes.
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