Li, Wenying Hwang, Jieun Chang, Wonyoung Setiadi, Handi Chung, Kyung Yoon Kim, Jaehoon 2024-01-20T03:04:24Z 2024-01-20T03:04:24Z 2021-09-05 2016-10 0896-8446 https://pubs.kist.re.kr/handle/201004/123597 Uniform and complete coverage of ultrathin carbon layer coatings on the surface of nano-sized LiFePO4 (LFP) particles prepared using a supercritical alcohol route was investigated. In the presence of oleylamine, nanosized oleylamine-modified LFP particles were synthesized in supercritical ethanol because particle growth was inhibited. When the oleylamine-modified LFP was calcined, uniform coverage of carbon layers with thicknesses of 1.5-2.0 nm on individual LFP particles was achieved. The carbon-coated LFP (C-LFP) exhibited hierarchical porous nano/micro sphere morphology with a porosity of 45.6%. In comparison with bare LFP synthesized in the absence of oleylamine, C-LFP exhibited excellent Li ion uptake performance; C-LFP delivered a reversible discharge capacity of 158.4 mAh g(-1) after 100 cycles at 0.1 C and a rate performance of 84.0 mAh g(-1) at 20 C. In addition, after 700 continuous cycles at 10 C, the C-LiFePO4 electrode exhibited a reversible discharge capacity of 84.0 mAh g(-1) with small capacity loss. Electrochemical impedance tests revealed that the uniform and ultrathin carbon coating improved charge transfer kinetics and lithium diffusion into the active material. Crown Copyright (C) 2016 Published by Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV LITHIUM-ION BATTERIES REDUCED GRAPHENE OXIDE SUPERCRITICAL METHANOL CATHODE MATERIALS IRON PHOSPHATE ELECTRODE MATERIALS RAW-MATERIAL DIFFUSION-COEFFICIENT COMPOSITE CATHODE FACILE SYNTHESIS Ultrathin and uniform carbon-layer-coated hierarchically porous LiFePO4 microspheres and their electrochemical performance Article 10.1016/j.supflu.2016.05.007 1 JOURNAL OF SUPERCRITICAL FLUIDS, v.116, pp.164 - 171 JOURNAL OF SUPERCRITICAL FLUIDS 116 164 171 scie scopus 000380621700019 2-s2.0-84976391685 Chemistry, Physical Engineering, Chemical Chemistry Engineering Article LITHIUM-ION BATTERIES REDUCED GRAPHENE OXIDE SUPERCRITICAL METHANOL CATHODE MATERIALS IRON PHOSPHATE ELECTRODE MATERIALS RAW-MATERIAL DIFFUSION-COEFFICIENT COMPOSITE CATHODE FACILE SYNTHESIS Carbon coating Supercritical alcohol LiFePO4 Lithium ion battery