| Autor: |
Lei Qin, Luke Schkeryantz, Yiying Wu |
| Rok vydání: |
2022 |
| Předmět: |
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| Zdroj: |
Angewandte Chemie (International ed. in English). |
| ISSN: |
1521-3773 |
| Popis: |
A battery cathode based on the superoxide/peroxide redox not only inherits the advantage of oxygen (O 2 ) batteries in high capacities and low costs but also overcomes the disadvantages in O 2 storage, electrolyte evaporation, and anode deactivation due to O 2 crossover. Herein, we report an enhanced potassium superoxide (KO 2 )/peroxide (K 2 O 2 ) conversion by adopting a high-donicity anion additive in the ether-based electrolyte. Such an anion was synthesized via a "Solvent-in-Anion" strategy and validated to enhance the electron donicity of the electrolyte. The use of highdonicity anion could lead to enhanced KO 2 utilization (~90.2%) by retarding electrode passivation and allow the full charging back of K 2 O 2 through the solution-mediated pathway without electrocatalysts. No apparent cell degradation is observed during the first 120 cycles by controlling the reversible depth-of-discharge capacity at 292 mAh g -1 KO2 within an O 2 -free region. The K-KO 2 cell delivers a high energy efficiency (84.4%) and a lifespan of over 1440 hours. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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