Construction of ultrathin N-doped carbon shell on LiFePO{sub 4} spheres as enhanced cathode for lithium ion batteries

Journal Article · Fri Dec 15 04:00:00 EST 2017 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2017.03.064· OSTI ID:22730488

Pan, G. X.; Zhang, Y. J.

Graphical abstract: N-doped carbon (N-C) coated LiFePO{sub 4} spheres have been prepared by a facile one-step spray drying method and demonstrated with high capacity and good cycling life as cathode of lithium ion batteries. - Highlights: • Construct N-C shell on LiFePO{sub 4} as enhanced cathode for LIBs. • LiFePO{sub 4}/N-C cathodes show high capacity and good cycling life. • N-C shell structure is favorable for fast electron transfer. - Abstract: Developing advanced cathode is playing a crucial role in the advancement of lithium ion batteries (LIBs). In this work, we report a novel one-step spray drying method for fabrication of N-doped carbon (N-C) coated LiFePO{sub 4} spheres forming LiFePO{sub 4}/N-C spheres composite. Thin N-C layer of about 5 nm was coating on the surface of LiFePO{sub 4} spheres. The electrochemical properties of LiFePO{sub 4}/N-C spheres composite have been thoroughly studied as cathode of LIBs. The LiFePO{sub 4}/N-C spheres composite delivers discharge capacities of 160, 143 and 115 mAh g{sup −1} at 1 C, 5 C and 20 C, respectively, much better than unmodified LiFePO{sub 4} cathode. A high discharge capacity of 159 mAh g{sup −1} is preserved with 99% capacity retention after 1000 cycles at 1 C. The enhanced performance is due to the introduction of N-C shell with improved electrical conductivity and structural stability.

• OSTI ID: 22730488
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 96; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CAPACITORS
CAPACITY
CATHODES
CONSTRUCTION
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTROCHEMISTRY
ELECTRON TRANSFER
ENERGY CONVERSION
ENERGY STORAGE
LITHIUM ION BATTERIES
LITHIUM IONS
POROUS MATERIALS
SPHERICAL CONFIGURATION
SPRAY DRYING
SYNTHESIS
THIN FILMS