Facile preparation of nanoporous and nanocrystalline LiFePO4 with excellent electrochemical properties
Artikel i vetenskaplig tidskrift, 2013

A modified sol-gel process for the preparation of a nanoporous LiFePO4 (LFP) cathode with a well-ordered carbon coating has been developed. The interconnected nanocrystalline LFP was fabricated by addition of sucrose at certain time intervals, which wraps the pore wall. The atomic structure of the LFP was investigated by Rietveld refinement. The surface structure and pore properties have been investigated by SEM, TEM and BET. The structure of the coated residual carbon on the LFP was analyzed by Raman spectroscopy. Lithium ion diffusion and interface properties of the LFP electrodes were investigated by CV and impedance measurements. The LFP displays a good crystal structure, high reversible capacity, good cycle stability, and high energy efficiency. It also shows excellent high rate capability with a 10 C rate capacity of up to 118.5 mA h g(-1) at the 100th cycle and a high tap density of 1.8 g cm(-3) as a cathode material.

POWDERS

CARBON-COATED LIFEPO4

MATERIAL

CATHODE

PRECURSOR

SOL-GEL SYNTHESIS

PERFORMANCE

LITHIUM-ION BATTERIES

COMPOSITES

RAMAN

IRON PHOSPHATE

Författare

Jae-Kwang Kim

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Johan Scheers

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Y. J. Choi

Chalmers

J. H. Ahn

Gyeongsang National University

G. C. Hwang

Gyeongsang National University

RSC Advances

2046-2069 (ISSN)

Vol. 3 43 20836-20842

Styrkeområden

Energi

Ämneskategorier

Kemi

DOI

10.1039/c3ra42516a

Mer information

Senast uppdaterat

2018-09-10