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A Versatile Strategy for Achieving Fast-Charging Batteries via Interfacial Engineering: Pseudocapacitive Potassium Storage without Nanostructuring.

Seoa KimHyeonjung JungWon-Gwang LimEunho LimChangshin JoKug-Seung LeeJeong Woo HanJinwoo Lee
Published in: Small (Weinheim an der Bergstrasse, Germany) (2022)
The rapid transport of alkali ions in electrodes is a long-time dream for fast-charging batteries. Though electrode nanostructuring has increased the rate-capability, its practical use is limited because of the low tap density and severe irreversible reactions. Therefore, development of a strategy to design fast-charging micron-sized electrodes without nanostructuring is of significant importance. Herein, a simple and versatile strategy to accelerate the alkali ion diffusion behavior in micron-sized electrode is reported. It is demonstrated that the diffusion rate of K + ions is significantly improved at the hetero-interface between orthorhombic Nb 2 O 5 (001) and monoclinic MoO 2 (110) planes. Lattice distortion at the hetero-interface generates an inner space large enough for the facile transport of K + ions, and electron localization near oxygen-vacant sites further enhances the ion diffusion behavior. As a result, the interfacial-engineered micron-sized anode material achieves an outstanding rate capability in potassium-ion batteries (KIBs), even higher than nanostructured orthorhombic Nb 2 O 5  which is famous for fast-charging electrodes. This is the first study to develop an intercalation pseudocapacitive micron-sized anode without nanostructuring for fast-charging and high volumetric energy density KIBs. More interestingly, this strategy is not limited to K + ion, but also applicable to Li + ion, implying the versatility of interfacial engineering for alkali ion batteries.
Keyphrases
  • ion batteries
  • solid state
  • carbon nanotubes
  • quantum dots
  • reduced graphene oxide
  • ionic liquid
  • molecular dynamics simulations
  • electron transfer
  • gold nanoparticles
  • early onset
  • loop mediated isothermal amplification