Journal
ENERGY STORAGE MATERIALS
Volume 30, Issue -, Pages 206-227Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2020.05.018
Keywords
Potassium-ion batteries; Potassium metal anode; Dendrite-free; Modification strategies; Review
Funding
- Taishan Scholars Program of Shandong Province [tsqn201812002, ts20190908]
- National Natural Science Foundation of China [51972198]
- Independent Innovation Foundation of Shandong University
- State Key Program of National Natural Science of China [61633015]
- Young Scholars Program of Shandong University [2016WLJH03]
- Project of the Taishan Scholar [ts201511004]
- Discipline Construction of High-Level Talents of Shandong University [31370089963078]
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Potassium (K) metal is the super star among all the anode materials for potassium-ion batteries because of its merits such as large abundance (similar to 0.0017 wt %), high theoretical specific capacity (687 mAh g(-1)) and low electrochemical potential (-2.93 V vs. the standard hydrogen electrode, SHE). Nevertheless, challenges such as extremely high reactivity, large volume change, unstable interface and uncontrollable growth of K dendrites hinder its further development and practical application. Various effective tactics have been put forward to solve the issues of K metal anodes in recent years. Herein, we detailedly summarize the recent strategies for stable and dendrite-free K metal anodes such as designing a host, interfacial engineering, replacing pure K metal with K-based alloys, modifying liquid electrolyte and replacing liquid electrolyte with solid-state electrolyte. We also proposed some perspectives and outlooks. We believe this review can attract related researchers and provide some help for the future development of K metal anodes.
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