Potassium ion energy storage devices are competitive candidates for grid-scale energy storage applications owing to the abundancy and cost-effectiveness of potassium (K) resources, the low standard redox potential of K/K+, and the high ionic conductivity in K-salt-containing electrolytes. However, the sluggish reaction dynamics and poor structural instability of battery-type anodes caused by the insertion/extraction of large K+ ions inhibit the full potential of K ion energy storage systems. Extensive efforts have been devoted to the exploration of promising anode materials. This Review begins with a brief introduction of the operation principles and performance indicators of typical K ion energy storage systems and significant advances in different types of battery-type anode materials, including intercalation-, mixed surface-capacitive-/intercalation-, conversion-, alloy-, mixed conversion-/alloy-, and organic-type materials. Subsequently, host-guest relationships are discussed in correlation with the electrochemical properties, underlying mechanisms, and critical issues faced by each type of anode material concerning their implementation in K ion energy storage systems. Several promising optimization strategies to improve the K+ storage performance are highlighted. Finally, perspectives on future trends are provided, which are aimed at accelerating the development of K ion energy storage systems.
|Number of pages||43|
|Publication status||Published - 2021 Dec 28|
Bibliographical noteFunding Information:
This work was supported by the Australian National Fabrication Facility’s Queensland Node (ANFF-Q) and the JST-ERATO Yamauchi Materials Space-Tectonics Project (JPMJER2003). S. Liu and S. C. Jun gratefully acknowledge the financial support from the national research foundation of Korea (NRF) grant funded by the Korea government (MIST) (No. NRF-2019R1A2C2090443), the Korea Electric Power Corporation (Grant No. R19XO01-23), and the Nano·Material Technology Development Program (NRF-2017M3A7B4041987).
© 2021 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physics and Astronomy(all)