Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202102326
Keywords
challenges; electrochemical mechanism; materials design; potassium– selenium batteries; tactic
Categories
Funding
- National Key Research Development Program of China [2019YFB2203400]
- 111 Project [B20030]
- UESTC Shared Research Facilities of Electromagnetic Wave and Matter Interaction [Y0301901290100201]
- Australian Research Council [DP210101486, DP200101862, DP200100365]
- Australian Research Council [DP200101862] Funding Source: Australian Research Council
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Rechargeable potassium-selenium batteries have attracted attention for their natural abundance, low redox potential of potassium, and high electronic conductivity of selenium. Despite progress in cathode materials design and electrochemical performance, challenges like low reactive activity, shuttle effect, and volume expansion remain.
Rechargeable potassium-selenium (K-Se) batteries, as an emerging electrochemical energy storage system, has recently captured intensive attention due to the desirable natural abundance and low redox potential of elemental potassium as well as the relatively high electronic conductivity and impressive theoretical volumetric capacity of elemental selenium. Although great progress on cathode materials design and electrochemical performance improvement has been made, K-Se batteries are still confronted with a series of key challenges, including low reactive activity, shuttle effect, volume expansion, potassium dendrite growth, and high chemical activity of potassium metal. The recent advances in rechargeable K-Se batteries are comprehensively summarized with an emphasis on discussing the electrochemical mechanisms and central challenges, presenting the synthesis, properties, and electrochemical performance of selenium-based cathode materials, and extending potential tactics for tackling the key issues and developmental directions for future research.
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