FeSe2 Graphite Intercalation Compound as Anode Materials for Sodium Ion Batteries FeSe2 Graphite Intercalation Compound as Anode Materials for Sodium Ion Batteries AITranslate

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DOI：https://doi.org/10.1021/acsaelm.3c01355

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Based on theoretical calculations, the molecule predominantly generated by the combination of sodium with graphite is identified as NaC186. Consequently, this compound has a relatively limited capacity for sodium storage, amounting to only 36 mA h g–1. In this study, we construct FeSe2 graphite intercalation compounds (FeSe2-GIC) by in situ inserting FeSe2 between the graphite interlayers by a hydrothermal process. The resulting FeSe2-GIC material is then subjected to ball milling to form the FeSe2-GIC-BM. The FeSe2 material was found to be tightly intercalated within the graphite layers, resulting in a limited volume expansion and improved electrical conductivity. The electrochemical test results indicate that the FeSe2-GIC-BM anode exhibits a remarkable electrochemical performance. It exhibits an initial specific discharge capacity of 676.2 mA h g–1 at a current density of 0.1 A g–1 and a specific discharge capacity of 425.0 mA h g–1 at a current density of 5 A g–1. After 1200 cycles, the observed reversible capacity remains at 182.9 mA h g–1. The exceptional storage and cycling characteristics can be attributed to the distinctive layered structure.