Influence of Particle Size and Crystal Orientation on the Electrochemical Behavior of Carbon-Coated LiFePO4

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• 作者：Stefania Ferrari ; Rodrigo Lassarote Lavall ; Doretta Capsoni ; Eliana Quartarone ; Aldo Magistris ; Piercarlo Mustarelli ; Patrizia Canton
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：July 29, 2010
• 年：2010
• 卷：114
• 期：29
• 页码：12598-12603
• 全文大小：339K
• 年卷期：v.114,no.29(July 29, 2010)
• ISSN：1932-7455

文摘

We investigate the influence of particle size and crystal orientation on the electrochemical behavior of carbon-coated LiFePO₄ prepared by a hydrothermal synthesis in the presence of a polymeric surfactant and a source of carbon. We evaluated the charge/discharge profiles of two samples, one constituted by particles in the micrometer range with a platelet-like shape (large ac facet and (020) crystal orientation) and another made of sub-micrometer-rounded particles with a random crystal orientation. At low current rates the crystal orientation seems to be the prevailing factor, whereas at high current rates smaller particles can allow a shorter electronic conduction path, so reducing the resistance experienced by Li ions during diffusion.