title: Enhancement of the Rate Capability of LiFePO4 by a New Highly Graphitic Carbon-Coating Method.
abstract: Low lithium ion diffusivity and poor electronic conductivity are two major drawbacks for the wide application of LiFePO4 in high-power lithium ion batteries. In this work, we report a facile and efficient carbon-coating method to prepare LiFePO4/graphitic carbon composites by in situ carbonization of perylene-3,4,9,10-tetracarboxylic dianhydride during calcination. Perylene-3,4,9,10-tetracarboxylic dianhydride containing naphthalene rings can be easily converted to highly graphitic carbon during thermal treatment. The ultrathin layer of highly graphitic carbon coating drastically increased the electronic conductivity of LiFePO4. The short pathway along the [010] direction of LiFePO4 nanoplates could decrease the Li(+) ion diffusion path. In favor of the high electronic conductivity and short lithium ion diffusion distance, the LiFePO4/graphitic carbon composites exhibit an excellent cycling stability at high current rates at room temperature and superior performance at low temperature (-20 °C).
authors.affiliation: Centre for Clean Energy Technology, School of Mathematics and Physical Sciences, Faculty of Science, University of Technology Sydney , Sydney, New South Wales 2007, Australia.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Song
authors.affiliation: Centre for Clean Energy Technology, School of Mathematics and Physical Sciences, Faculty of Science, University of Technology Sydney , Sydney, New South Wales 2007, Australia.
authors.forename: Bing
authors.initials: B
authors.lastname: Sun
authors.affiliation: Centre for Clean Energy Technology, School of Mathematics and Physical Sciences, Faculty of Science, University of Technology Sydney , Sydney, New South Wales 2007, Australia.
authors.forename: Hao
authors.initials: H
authors.lastname: Liu
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Ma
authors.forename: Zhouhao
authors.initials: Z
authors.lastname: Chen
authors.forename: Guangjie
authors.initials: G
authors.lastname: Shao
authors.affiliation: Centre for Clean Energy Technology, School of Mathematics and Physical Sciences, Faculty of Science, University of Technology Sydney , Sydney, New South Wales 2007, Australia.
authors.forename: Guoxiu
authors.initials: G
authors.lastname: Wang
keywords: electronic conductivity; graphitic carbon; high rate; lithium iron phosphate; low temperature