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Open AccessArticle

Solvothermal Synthesis of a Hollow Micro-Sphere LiFePO4/C Composite with a Porous Interior Structure as a Cathode Material for Lithium Ion Batteries

1
Laboratory for Microstructures, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
2
Shanghai Key Laboratory of Modern Metallurgy & Materials Processing, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
3
Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, NSW 2522, Australia
4
Department of Chemistry and Forensic Science, University of Technology Sydney, Sydney, NSW 2007, Australia
*
Authors to whom correspondence should be addressed.
Nanomaterials 2017, 7(11), 368; https://doi.org/10.3390/nano7110368
Received: 26 September 2017 / Revised: 22 October 2017 / Accepted: 24 October 2017 / Published: 3 November 2017
(This article belongs to the Special Issue Electrochemically Engineering of Nanoporous Materials)
To overcome the low lithium ion diffusion and slow electron transfer, a hollow micro sphere LiFePO4/C cathode material with a porous interior structure was synthesized via a solvothermal method by using ethylene glycol (EG) as the solvent medium and cetyltrimethylammonium bromide (CTAB) as the surfactant. In this strategy, the EG solvent inhibits the growth of the crystals and the CTAB surfactant boots the self-assembly of the primary nanoparticles to form hollow spheres. The resultant carbon-coat LiFePO4/C hollow micro-spheres have a ~300 nm thick shell/wall consisting of aggregated nanoparticles and a porous interior. When used as materials for lithium-ion batteries, the hollow micro spherical LiFePO4/C composite exhibits superior discharge capacity (163 mAh g−1 at 0.1 C), good high-rate discharge capacity (118 mAh g−1 at 10 C), and fine cycling stability (99.2% after 200 cycles at 0.1 C). The good electrochemical performances are attributed to a high rate of ionic/electronic conduction and the high structural stability arising from the nanosized primary particles and the micro-sized hollow spherical structure. View Full-Text
Keywords: lithium ion battery; lithium iron phosphate; solvothermal method; micro hollow sphere lithium ion battery; lithium iron phosphate; solvothermal method; micro hollow sphere
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MDPI and ACS Style

Liu, Y.; Zhang, J.; Li, Y.; Hu, Y.; Li, W.; Zhu, M.; Hu, P.; Chou, S.; Wang, G. Solvothermal Synthesis of a Hollow Micro-Sphere LiFePO4/C Composite with a Porous Interior Structure as a Cathode Material for Lithium Ion Batteries. Nanomaterials 2017, 7, 368.

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