Defect-free potassium manganese hexacyanoferrate cathode material for high-performance potassium-ion batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33846311.
- Also identified by DOI 10.1038/s41467-021-22499-0 and PMC identifier 8041879.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Potassium-ion batteries (KIBs) are promising electrochemical energy storage systems because of their low cost and high energy density. However, practical exploitation of KIBs is hampered by the lack of high-performance cathode materials. Here we report a potassium manganese hexacyanoferrate (K<sub>2</sub>Mn[Fe(CN)<sub>6</sub>]) material, with a negligible content of defects and water, for efficient high-voltage K-ion storage. When tested in combination with a K metal anode, the K<sub>2</sub>Mn[Fe(CN)<sub>6</sub>]-based electrode enables a cell specific energy of 609.7 Wh kg<sup>-1</sup> and 80% capacity retention after 7800 cycles. Moreover, a K-ion full-cell consisting of graphite and K<sub>2</sub>Mn[Fe(CN)<sub>6</sub>] as anode and cathode active materials, respectively, demonstrates a specific energy of 331.5 Wh kg<sup>-1</sup>, remarkable rate capability, and negligible capacity decay for 300 cycles. The remarkable electrochemical energy storage performances of the K<sub>2</sub>Mn[Fe(CN)<sub>6</sub>] material are attributed to its stable frameworks that benefit from the defect-free structure.