Eutectic Crystallization Activates Solid‐State Zinc‐Ion Conduction

Abstract

Solid-state zinc (Zn) batteries offer anew candidate for emerging applications sensitive to volume,safety and cost. However,c urrent solid polymeric or ceramic electrolyte structures remain poorly conductive for the divalent Zn 2+ , especially at room temperature.C onstructing aheterogeneous interface whichallows Zn 2+ percolation is aviable option, but this is rarely involved in multivalent systems.H erein, we construct as olid Zn 2+ -ion conductor by inducing crystallization of tailored eutectic liquids formed by organic Zn salts and bipolar ligands.H igh-entropye utectic-networks weaken the ion-association and form interfacial Zn 2+ -percolated channels on the nucleator surfaces,r esulting in as olid crystal with exceptional selectivity for Zn 2+ transport (t Zn 2þ = 0.64) and appreciable Zn 2+ conductivity (s Zn 2þ = 3.78 10 À5 Scm À1 at 30 8 8C, over 2o rders of magnitude higher than conventional polymers), and finally enabling practical ambient-temperature Zn/V 2 O 5 metal solid cells.T his design principle leveraged by the eutectic solidification affords new insights on the multivalent solid electrochemistry suffering from slow ion migration.

All-round supramolecular zwitterionic hydrogel electrolytes enabling environmentally adaptive dendrite-free aqueous zinc ion capacitors

“…S37 (ESI †). Specifically, the ultrahigh t Zn 2+ of 0.86, 0.84, and 0.83 obtained for the CP/EGZn/zwitterion (betaine, proline, and DMG) hydrogel electrolytes is much higher than that of the CP/EGZn hydrogel electrolyte (0.6), and comparable to zwitterion, 22,48,72,73 PAM, 21,74 and PVA gel electrolytes, 75 eutectic electrolyte, 76 and biopolymer electrolytes. 77,78 This not only can ensure a uniform ion distribution at the Zn anode interface but is also beneficial for inhibiting the growth of Zn dendrites.…”

Zinc‐Contained Alloy as a Robustly Adhered Interfacial Lattice Locking Layer for Planar and Stable Zinc Electrodeposition

“…[ 50,51 ] And higher response current density at ILL@Ti electrode can ameliorate the diffusion behavior of Zn 2+ and promote the deposition of homogeneous nucleated Zn. [ 52 ]…”

“…[50,51] And higher response current density at ILL@Ti electrode can ameliorate the diffusion behavior of Zn 2+ and promote the deposition of homogeneous nucleated Zn. [52] The cycling stability of the bare Zn or ILL@Zn electrodes was evaluated with Zn||Zn symmetrical cells. Figure 4a compares the plating/stripping curves of the cells bare Zn or ILL@ Zn electrodes at current densities of 0.5, 1, 2, 4, and 8 mA cm −2 and an areal capacity of 1 mAh cm −2 .…”

Recent progress of dendrite‐free stable zinc anodes for advanced zinc‐based rechargeable batteries: Fundamentals, challenges, and perspectives

“…The decreased number of active H 2 O molecules, restrained side reactions, and active water decomposition are devoted to the comparable rate capability and remarkable cyclability of 2000 h at 1 mA/cm 2 and 1 mA h/cm 2 . In addition, Qiu et al 146 . revealed a solid zinc ion conductor based on the tailored eutectic liquids formed by bipolar ligands and organic zinc salts.…”

“…The decreased number of active H 2 O molecules, restrained side reactions, and active water decomposition are devoted to the comparable rate capability and remarkable cyclability of 2000 h at 1 mA/cm 2 and 1 mA h/cm 2 . In addition, Qiu et al 146 revealed a solid zinc ion conductor based on the tailored eutectic liquids formed by bipolar ligands and organic zinc salts. Nano-TiO 2 performed as nucleation seeds resulted in the Zn(TFSI) 2 -based DES to form the crystal nuclei along the surface of the nanoparticles at ultralow undercooling (Figure 8D), which weakened ionic associations and produced a high zinc transference number of 0.64.…”