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A Versatile Strategy for Achieving Fast-Charging Batteries via Interfacial Engineering: Pseudocapacitive Potassium
Seoa Kim1, Hyeonjung Jung2, Won-Gwang Lim1
1Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea.
Small (Weinheim an Der Bergstrasse, Germany)
|June 6, 2022
Summary
Researchers developed a new strategy for fast-charging micron-sized electrodes without nanostructuring. This interfacial engineering approach significantly enhances potassium-ion diffusion for high-performance potassium-ion batteries (KIBs).
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Achieving rapid alkali-ion transport in battery electrodes is crucial for fast-charging applications.
- Electrode nanostructuring improves rate capability but suffers from low tap density and irreversible reactions.
- Developing fast-charging micron-sized electrodes without nanostructuring is a significant challenge.
Purpose of the Study:
- To report a versatile strategy for accelerating alkali-ion diffusion in micron-sized electrodes.
- To demonstrate enhanced potassium-ion (K+) diffusion at the hetero-interface of orthorhombic Nb2O5 and monoclinic MoO2.
- To develop a micron-sized anode for fast-charging and high volumetric energy density potassium-ion batteries (KIBs).
Main Methods:
- Fabrication of micron-sized electrode materials with engineered hetero-interfaces.
- Investigation of K+ ion diffusion mechanisms at the Nb2O5/MoO2 interface using advanced characterization.
- Electrochemical testing of the engineered electrode in potassium-ion battery configurations.
Main Results:
- Significantly improved K+ ion diffusion rate at the hetero-interface between orthorhombic Nb2O5 (001) and monoclinic MoO2 (110) planes.
- Lattice distortion and electron localization at the interface create pathways for facile K+ ion transport.
- The interfacial-engineered micron-sized anode exhibits superior rate capability in KIBs, surpassing nanostructured Nb2O5.
- Demonstrated intercalation pseudocapacitive behavior in a micron-sized anode without nanostructuring.
Conclusions:
- A novel strategy for interfacial engineering enables fast-charging micron-sized electrodes for KIBs.
- This approach overcomes limitations of nanostructuring, offering high rate capability and volumetric energy density.
- The interfacial engineering strategy is versatile and applicable to other alkali-ion batteries, including lithium-ion batteries.
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