The development of multielectron redox-active cathode materials is a top priority for achieving high energy density with long cycle life in the next-generation secondary battery applications. Triggering anion redox activity is regarded as a promising strategy to enhance the energy density of polyanionic cathodes for Li/Na-ion batteries. Herein, KFe(CO) is shown to be a promising new cathode material that combines metal redox activity with oxalate anion (CO ) redox. This compound reveals specific discharge capacities of 116 and 60 mAh g for sodium-ion batterie (NIB) and lithium-ion batterie (LIB) cathode applications, respectively, at a rate of 10 mA g, with excellent cycling stability. The experimental results are complemented by density functional theory (DFT) calculations of the average atomic charges.
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| http://dx.doi.org/10.1021/acs.chemmater.3c00063 | DOI Listing |
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