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Influence of carbon additive on the properties of spherical Li4Ti5O12 and LiFePO4 materials for lithium-ion batteries

Influence of carbon additive on the properties of spherical Li4Ti5O12 and LiFePO4 materials for... Preparing spherical particles with carbon additive is considered as one effective way to improve both high rate performance and tap density of Li4Ti5O12 and LiFePO4 materials. Spherical Li4Ti5O12/C and LiFePO4/C composites are prepared by spray-drying–solid-state reaction method and controlled crystallization–carbothermal reduction method, respectively. The X-ray diffraction characterization, scanning electron microscope, Brunauer–Emmett–Teller, alternating current impedance analyzing, tap density testing, and electrochemical property measurements are investigated. After hybridizing carbon with a proper quantity, the crystal grain size of active materials is remarkably decreased and the electrochemical properties are obviously improved. The Li4Ti5O12/C and LiFePO4/C composites prepared in this work are spherical. The tap density and the specific surface area are as high as 1.71 g cm−3 and 8.26 m2 g−1 for spherical Li4Ti5O12/C, which are 1.35 g cm−3 and 18.86 m2 g−1 for spherical LiFePO4/C powders. Between 1.0 and 3.0 V versus Li, the reversible specific capacity of the Li4Ti5O12/C is more than 150 mAh g−1 at 1.0-C rate. Between 2.5 and 4.2 V versus Li, the reversible capacity of the LiFePO4/C is close to 140 mAh g−1 at 1.0-C rate. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Influence of carbon additive on the properties of spherical Li4Ti5O12 and LiFePO4 materials for lithium-ion batteries

Ionics , Volume 16 (5) – Feb 23, 2010

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References (19)

Publisher
Springer Journals
Copyright
Copyright © 2010 by Springer-Verlag
Subject
Chemistry; Condensed Matter Physics; Optical and Electronic Materials; Renewable and Green Energy; Electrochemistry
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-010-0423-4
Publisher site
See Article on Publisher Site

Abstract

Preparing spherical particles with carbon additive is considered as one effective way to improve both high rate performance and tap density of Li4Ti5O12 and LiFePO4 materials. Spherical Li4Ti5O12/C and LiFePO4/C composites are prepared by spray-drying–solid-state reaction method and controlled crystallization–carbothermal reduction method, respectively. The X-ray diffraction characterization, scanning electron microscope, Brunauer–Emmett–Teller, alternating current impedance analyzing, tap density testing, and electrochemical property measurements are investigated. After hybridizing carbon with a proper quantity, the crystal grain size of active materials is remarkably decreased and the electrochemical properties are obviously improved. The Li4Ti5O12/C and LiFePO4/C composites prepared in this work are spherical. The tap density and the specific surface area are as high as 1.71 g cm−3 and 8.26 m2 g−1 for spherical Li4Ti5O12/C, which are 1.35 g cm−3 and 18.86 m2 g−1 for spherical LiFePO4/C powders. Between 1.0 and 3.0 V versus Li, the reversible specific capacity of the Li4Ti5O12/C is more than 150 mAh g−1 at 1.0-C rate. Between 2.5 and 4.2 V versus Li, the reversible capacity of the LiFePO4/C is close to 140 mAh g−1 at 1.0-C rate.

Journal

IonicsSpringer Journals

Published: Feb 23, 2010

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