Abstract
CF x deliver the ultra-high theoretical specific capacity. Nevertheless, its solvent co-intercalation for rechargeable Na–ion battery cathodes has lacked investigation. Here, we explored the co–intercalation behaviour with 1 M NaPF6 in PC or FEC for various CF x and found that 1 M NaPF6 in FEC is conducive to solvent co–intercalation in the extended discharge voltage window to 1.0 V. Among them, F-CF0.88 cathodes present a discharge-specific capacity for the first time of 1094 mAh g−1, which keeps a stable rechargeable specific capacity of 344 mAh g−1. This improved rechargeable behaviour is connected with the solvent co-intercalation. And the reason is that the solvation energy of fluoroethylene carbonate (FEC) is larger and easier to embed. Our study offers new ideas and a deep understanding of solvent co-intercalation of CF x as Na–ion rechargeable battery.
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