A zinc-conducting chalcogenide electrolyte.

ABSTRACT: A solid-state zinc-ion battery can fundamentally eliminate dendrite formation and hydrogen evolution on the zinc anode from aqueous systems. However, enabling fast zinc ion ⁺ conduction in solid crystals is thought to be impossible. Here, we demonstrated a fluorine-doping approach to achieving fast Zn²⁺ transport in mesoporous Zn_yS_1-xF_x. The substitutional doping of fluoride ion with sulfide substantially reduces Zn²⁺ migration barrier in a crystalline phase, while mesopore channels with bounded dimethylformamide enable nondestructive Zn²⁺ conduction along inner pore surface. This mesoporous conductor features a high room-temperature Zn²⁺ conductivity (0.66 millisiemens per centimeter, compared with 0.01 to 1 millisiemens per centimeter for lithium solid-state electrolyte) with a superior cycling performance (89.5% capacity retention over 5000 cycles) in a solid zinc-ion battery and energy density (0.04 watt-hour per cubic centimeter) in a solid zinc-ion capacitor. The universality of this crystal engineering approach was also verified in other mesoporous zinc chalcogenide materials, which implies various types of potential Zn²⁺-conducting solid electrolytes.

SUBMITTER: Zhi J 

PROVIDER: S-EPMC9882973 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature