Journal
ADVANCED ENERGY MATERIALS
Volume 11, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202003346
Keywords
anode; electrolytes; metal phosphides; potassium ion batteries; solid‐ electrolyte interface
Categories
Funding
- Australian Research Council (ARC) Centre of Excellence Scheme [CE 140100012]
- China Scholarship Council
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Concentrated electrolyte is used to improve the cycling stability of potassium metal and potassium-ion batteries, mitigating the capacity degradation of metal phosphides and providing a feasible strategy for building high-energy-density potassium-ion batteries.
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.
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