Journal
ADVANCED SCIENCE
Volume 9, Issue 20, Pages -Publisher
WILEY
DOI: 10.1002/advs.202200683
Keywords
anode; diffusion kinetics; potassium-ion batteries; rate capability; two phase interfaces
Categories
Funding
- National Natural Science Foundation of China [22008053, 52002111]
- Key Research and Development Program of Hebei Province [20310601D, 205A4401D]
- Natural Science Foundation of Hebei Province [B2021208061]
- High Level Talents Funding of Hebei Province [A202005006]
- Science Foundation of University of Hebei Province [BJ2020026, BJ2021001]
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This review starts from the fundamental understanding of the two-phase interface and analyzes the effect of different improvement strategies on it. Researches on the two-phase interface have made progress but also face challenges. This review provides guidance for developing other advanced anodes.
Potassium-ion batteries (PIBs) exhibit a considerable application prospect for energy storage systems due to their low cost, high operating voltage, and superior ionic conductivity. As a vital configuration in PIBs, the two-phase interface, which refers to K-ion diffusion from the electrolyte to the electrode surface (solid-liquid interface) and K-ion migration between different particles (solid-solid interface), deeply determines the diffusion/reaction kinetics and structural stability, thus significantly affecting the rate performance and cyclability. However, researches on two-phase interface are still in its infancy and need further attentions. This review first starts from the fundamental understanding of solid-liquid and solid-solid interfaces to in-depth analyzing the effect mechanism of different improvement strategies on them, such as optimization of electrolyte and binders, heterostructure design, modulation of interlayer spacing, etc. Afterward, the research progress of these improvement strategies is summarized comprehensively. Finally, the major challenges are proposed, and the corresponding solving strategies are presented. This review is expected to give an insight into the importance of two-phase interface on diffusion/reaction kinetics, and provides a guidance for developing other advanced anodes in PIBs.
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