Achieving High-Performance Metal Phosphide Anode for Potassium Ion Batteries via Concentrated Electrolyte Chemistry
Publication Name
Advanced Energy Materials
Abstract
Metal phosphides are regarded as promising anode candidates for high-energy-density potassium-ion batteries (PIBs) due to their high theoretical capacity and relatively low operation voltage. The failure mechanism of the metal phosphides originates from the large volume variation during cycling, which leads to fast capacity degradation. Herein, concentrated electrolyte is used to achieve impressive cycling stability for K-metal and K-ion batteries over their more dilute counterparts, mainly benefiting from the anion-derived robust and uniform solid–electrolyte interphase layer, which is helpful in maintaining the electrode integrity, avoiding excessive side reactions, and suppressing electrolyte decomposition. Further investigations also reveal the synergistic advantages of the superior chemical compatibility of concentrated electrolyte to potassium metal, as well as its remarkable electrochemical stability and enhanced safety compared to conventional dilute electrolytes. This work provides a feasible strategy to mitigate the degradation of metal phosphides to build high-energy-density PIBs.
Open Access Status
This publication is not available as open access
Volume
11
Issue
6
Article Number
2003346
Funding Number
CE 140100012
Funding Sponsor
Australian Research Council