Synthesis of Lithium Iron Phosphate/Carbon Microspheres by Using Polyacrylic Acid Coated Iron Phosphate Nanoparticles Derived from Iron(III) Acrylate

Lithium iron phosphate/carbon (LiFePO4/C) microspheres with high rate and cycling performance are synthesized from iron phosphate/polyacrylic acid (FePO4/PAA) nanoparticles. Iron(III) acrylate is used as a precursor for both the iron and carbon sources. FePO4 nanoparticles are first produced by a co...

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Bibliographic Details
Published in:ChemSusChem 2015-03, Vol.8 (6), p.1009-1016
Main Authors: Xu, Dongwei, He, Yan-Bing, Chu, Xiaodong, Ding, Zhaojun, Li, Baohua, He, Jianfu, Du, Hongda, Qin, Xianying, Kang, Feiyu
Format: Article
Language:English
Subjects:
Acrylates - chemistry
Acrylic Resins - chemistry
Acrylics
Carbon
Carbon - chemistry
Chemistry Techniques, Synthetic
Electric Conductivity
electrochemistry
Ferric Compounds - chemistry
Iron - chemistry
lithium
Lithium - chemistry
Microspheres
Models, Molecular
Molecular Conformation
Nanoparticles
Nanoparticles - chemistry
Phosphates - chemical synthesis
Phosphates - chemistry
polymers
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Summary:Lithium iron phosphate/carbon (LiFePO4/C) microspheres with high rate and cycling performance are synthesized from iron phosphate/polyacrylic acid (FePO4/PAA) nanoparticles. Iron(III) acrylate is used as a precursor for both the iron and carbon sources. FePO4 nanoparticles are first produced by a coprecipitation reaction. The byproduct, acrylic acid ions, is polymerized in situ to form a uniform PAA layer on the surface of the FePO4 nanoparticles. The as‐prepared LiFePO4/C microspheres are composed of primary nanoparticles with sizes of 40–50 nm. The nanoparticles are fully coated with a thin, uniform carbon layer derived from the decomposition of the PAA layer. The uniform carbon‐coating layer cooperates with interstitial and boundary carbon derived from sucrose successfully to construct an excellent interconnecting conductive network in the microspheres. As a result of the unique structure, the as‐prepared LiFePO4/C microspheres display both high electronic and ionic conductivities, which contribute to their high rate performance (162.9 mAh g−1 at 0.1C and 126.1 mAh g−1 at 5C) and excellent cycling stability (97.1 % of capacity retention after 500 cycles at 5C/5C). Under cover: Lithium iron phosphate/carbon (LiFePO4/C) microspheres with high rate and cycling performances are synthesized from nanoparticles. A complete carbon coating on the surface of the primary nanoparticles, derived from carbonation of the in situ polymerized PAA layer, controls the grain growth effectively and greatly enhances the electronic and ionic conductivities of the LiFePO4/C electrode.
ISSN:1864-5631
1864-564X
DOI:10.1002/cssc.201403060