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

被引：115

作者：

Ferrari, Stefania ^{[1
]}

Lavall, Rodrigo Lassarote ^{[1
]}

Capsoni, Doretta ^{[1
]}

Quartarone, Eliana ^{[1
]}

Magistris, Aldo ^{[1
]}

Mustarelli, Piercarlo ^{[1
]}

Canton, Patrizia ^{[2
]}

机构：

[1] Univ Pavia, Dipartimento Chim Fis M Rolla, I-27100 Pavia, Italy

[2] Univ Ca Foscari, Dipartimento Chim Fis, Venice, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 29期

关键词：

RAY-POWDER DIFFRACTOMETER; CATHODE MATERIAL; LI-INSERTION/EXTRACTION; AXIAL DIVERGENCE; PHOSPHO-OLIVINES; LITHIUM; PROFILE; REACTIVITY; CAPACITY; DENSITY;

D O I：

10.1021/jp1025834

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：12598 / 12603

页数：6

共 34 条

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