Anion-Reinforced Solvation Structure Enables Stable Operation of Ether-Based Electrolyte in High-Voltage Potassium Metal Batteries.
Angew Chem Int Ed Engl
; 63(30): e202402946, 2024 Jul 22.
Article
in En
| MEDLINE
| ID: mdl-38696279
ABSTRACT
Electrolytes with anion-dominated solvation are promising candidates to achieve dendrite-free and high-voltage potassium metal batteries. However, it's challenging to form anion-reinforced solvates at low salt concentrations. Herein, we construct an anion-reinforced solvation structure at a moderate concentration of 1.5â
M with weakly coordinated cosolvent ethylene glycol dibutyl ether. The unique solvation structure accelerates the desolvation of K+, strengthens the oxidative stability to 4.94â
V and facilitates the formation of inorganic-rich and stable electrode-electrolyte interface. These enable stable plating/stripping of K metal anode over 2200â
h, high capacity retention of 83.0 % after 150 cycles with a high cut-off voltage of 4.5â
V in K0.67MnO2//K cells, and even 91.5 % after 30 cycles under 4.7â
V. This work provides insight into weakly coordinated cosolvent and opens new avenues for designing ether-based high-voltage electrolytes.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Angew Chem Int Ed Engl
/
Angew. Chem. (Int. ed., Internet)
/
Angewandte Chemie (International ed. Internet)
Year:
2024
Document type:
Article
Affiliation country:
China
Country of publication:
Germany