Beschreibung:
High-capacity cathode materials of metal fluorides generally undergo low conductivities and sluggish kinetics derived from a multielectron-transfer conversion reaction mechanism, which severely hinder the cycling stability and rate performance to realize commercialization. Herein, a flexible free-standing FeF 3 / chitosan pyrolytic carbon/reduced graphene oxide (FeF 3 /C/RGO) film as additive-free cathode was designed and prepared by a facile hydrothermal strategy followed by sequential freeze-drying, thermal reduction and fluorination post-treatments. The ultrafine FeF 3 nanoparticles (NPs, ~30 nm) are confined within highly ordered RGO film, effectively reducing the Li + diffusion pathway while the RGO sheets act as a matrix to restrict the complicated interlamination reaction (Fe 3+ ⇄Fe 2+ ⇄Fe) between adjacent interlayers with the spacing of ~30nm. Benefiting from the free-standing structure, the FeF 3 /C/RGO film can achieve an admirable capacity up to 220.1 mAh·g –1 over 200 cycles at 100 mA·g –1 , showing great potential for wearable and flexible electronic devices