Accelerated removal of Fe-antisite defects while nanosizing hydrothermal LiFePO₄ with Ca²⁺

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DOI	Resolve DOI: https://doi.org/10.1021/acs.nanolett.6b00334
Author	Search for: Paolella, Andrea; Search for: Turner, Stuart; Search for: Bertoni, Giovanni; Search for: Hovington, Pierre; Search for: Flacau, Roxana¹ ; Search for: Boyer, Chad¹ ; Search for: Feng, Zimin; Search for: Colombo, Massimo; Search for: Marras, Sergio; Search for: Prato, Mirko; Search for: Manna, Liberato; Search for: Guerfi, Abdelbast; Search for: Demopoulos, George P.; Search for: Armand, Michel; Search for: Zaghib, Karim
Name affiliation	National Research Council Canada. Security and Disruptive Technologies
Format	Text
Type	Article
Journal title	Nano Letters
ISSN	1530-6984 1530-6992
Volume	16
Issue	4
Pages	2692–2697
Subject	Antisite; LiFePO₄; calcium; surface; defects; hydrothermal
Abstract	Based on neutron powder diffraction (NPD) and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), we show that calcium ions help eliminate the Fe-antisite defects by controlling the nucleation and evolution of the LiFePO₄ particles during their hydrothermal synthesis. This Ca-regulated formation of LiFePO₄ particles has an overwhelming impact on the removal of their iron antisite defects during the subsequent carbon-coating step since (i) almost all the Fe-antisite defects aggregate at the surface of the LiFePO₄ crystal when the crystals are small enough and (ii) the concomitant increase of the surface area, which further exposes the Fe-antisite defects. Our results not only justify a low-cost, efficient and reliable hydrothermal synthesis method for LiFePO₄ but also provide a promising alternative viewpoint on the mechanism controlling the nanosizing of LiFePO₄, which leads to improved electrochemical performances.
Publication date	2016-03-11
Publisher	ACS Publications
Terms of use	Permission is granted to temporarily download one copy of the materials for personal, noncommercial transitory viewing only. NRC Publications Archive - Copyright and terms of use
Language	English
Peer reviewed	Yes
NPARC number	23000355
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Record identifier	9c4e096d-0c16-4cab-a2cd-5894bdc25dec
Record created	2016-07-08
Record modified	2019-03-08

Date modified:: 2019-03-26

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