Multiple Electron Transfers Enable High‐Capacity Cathode Through Stable Anionic Redox
Source abstract
Abstract
Abstract Single‐electron transfer, low alkali metal contents, and large‐molecular masses limit the capacity of cathodes. This study uses a cost‐effective and light‐molecular‐mass orthosilicate material, K 2 FeSiO 4 , with a high initial potassium content, as a cathode for potassium‐ion batteries to enable the transfer of more than one electron. Despite the limited valence change of Fe ions during cycling, K 2 FeSiO 4 can undergo multiple electron transfers via successive oxygen anionic redox reactions to generate a high reversible capacity. Although the formation of O‒O dimers in K 2 FeSiO 4 occur upon removing large amounts of potassium, the strong binding effect of Si on O mitigates irreversible oxygen release and voltage degradation during cycling. K 2 FeSiO 4 achieves 236 mAh g −1 at 50 mA g −1 , with an energy density of 520 Wh kg −1 , which can be comparable with commercial LiFePO 4 materials. Moreover, it also exhibits 1400 stable cycles under high‐current conditions. These findings enhance the potential commercialization prospects for potassium‐ion batteries.
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Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced battery technologies research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Physics and Electronics Hunan University Changsha 410082 P. R. China
School of Physical Science and Technology ShanghaiTech University Shanghai 201210 P. R. China
Materials Science and Engineering Program MATEC key lab Guangdong Technion–Israel Institute of Technology Shantou 515063 P. R. China
Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 P. R. China
Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai 201204 P. R. China
Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 P. R. China
Department of Physics and Astronomy Clemson Nanomaterials Institute Clemson University South Carolina SC 29634 USA
School of Materials Science and Engineering Central South University Changsha 410083 P. R. China
Funding
National Natural Science Foundation of China
References (62)
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