Ali, Ghulam Lee, Ji-Hoon Chang, Wonyoung Cho, Byung-Won Jung, Hun-Gi Nam, Kyung-Wan Chung, Kyung Yoon 2024-01-20T02:03:47Z 2024-01-20T02:03:47Z 2021-09-01 2017-02-07 2045-2322 https://pubs.kist.re.kr/handle/201004/123071 The growing demand for lithium-ion batteries (LIBs) requires investigation of high-performance electrode materials with the advantages of being environmentally friendly and cost-effective. In this study, a nanocomposite of open-pyrochlore-structured FeF3 center dot 0.5H(2)O and reduced graphene oxide (RGO) is synthesized for use as a high-performance cathode in LIBs, where RGO provides high electrical conductivity to the composite material. The morphology of the composite shows that FeF3 center dot 0.5H(2)O spheres are embedded into RGO layers and high-resolution TEM image shows that those spheres are composed of primary nanoparticles with a size of similar to 5 nm. The cycling performance indicates that the composite electrode delivers an initial high discharge capacity of 223 mAh g(-1) at 0.05 C, a rate capability up to a high C-rate of 10 C (47 mAh g(-1)) and stable cycle performance at 0.05 C (145 mAh g(-1) after 100 cycles) and 0.2 C (93 mAh g(-1) after 100 cycles) while maintaining high electrochemical reversibility. Furthermore, the responsible electrochemical reaction is investigated using in-situ XRD and synchrotron-based X-ray absorption spectroscopy (XAS), and the XRD results show that FeF3 center dot 0.5H(2)O transitions to an amorphous-like phase through a lithiation process. However, a reversible oxidation change of Fe3+<-> Fe2+ is identified by the XAS results. English NATURE PUBLISHING GROUP LI-ION BATTERIES IRON TRIFLUORIDE ANODE MATERIALS LOW-COST GRAPHENE FEF3 FLUORIDE FABRICATION STORAGE ENERGY Lithium intercalation mechanism into FeF3 center dot 0.5H(2)O as a highly stable composite cathode material Article 10.1038/srep42237 1 Scientific Reports, v.7 Scientific Reports 7 scie scopus 000393377300001 2-s2.0-85011851637 Multidisciplinary Sciences Science & Technology - Other Topics Article LI-ION BATTERIES IRON TRIFLUORIDE ANODE MATERIALS LOW-COST GRAPHENE FEF3 FLUORIDE FABRICATION STORAGE ENERGY FeF3·0.5H2O cathode Lithium intercalation lithium ion batteries