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Title: Encapsulation of LiFePO{sub 4} by in-situ graphitized carbon cage towards enhanced low temperature performance as cathode materials for lithium ion batteries

The severe capacity decay of LiFePO{sub 4} at low temperatures (≤0 °C) limits its wide applications as cathode materials for energy storage batteries. Creating comprehensive carbon network between particles with improved electronic conductivity is a well known solution to this problem. Here, a novel structured LiFePO{sub 4}/C composite was prepared by a facile solid state route, in which nanosized LiFePO{sub 4} spheres were encapsulated by in-situ graphitized carbon cages. With the enhancement in electronic conductivity (2.15e−1 S cm{sup −1}), the composite presented excellent rate performance at room temperature and remarkable capacity retention at −40 °C, with charge transfer resistance much lower than commercial LiFePO{sub 4}. - Graphical abstract: A novel structured LiFePO{sub 4/}C composite was prepared by a facile solid state route, in which nanosized LiFePO{sub 4} spheres were encapsulated by in-situ graphitized carbon cages. - Highlights: • Several nano-sized LiFePO{sub 4} particles are encapsulated in carbon cage. • Carbon is in-situ graphitized with enhanced electronic conductivity. • The as prepared LiFePO{sub 4} exhibits notable capacity retention at −40 °C. • R{sub ct} is lowered by a factor of ∼10 compared with commercial LiFePO{sub 4}.
Authors:
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Publication Date:
OSTI Identifier:
22443377
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 216; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 77 NANOSCIENCE AND NANOTECHNOLOGY; CARBON; CATHODES; ENCAPSULATION; ENERGY STORAGE; LITHIUM ION BATTERIES; NANOSTRUCTURES; PARTICLES; SOLIDS; SOLUTIONS