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Issue 12, 2011
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Structurally stabilized olivine lithium phosphate cathodes with enhanced electrochemical properties through Fe doping

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Abstract

Controlling the crystallographic structure in olivine lithium phosphates is crucial for obtaining superior electronic (J. Electrochem. Soc., 2002, 149, A1184-A1189) and ionic conductivities (Electrochem. Solid-State Lett., 2006, 9, A352-A355; Electrochem. Solid-State Lett., 2006, 9, A439-A442; Nat. Mater., 2002, 1, 123-128), and stability, for use as cathodes in lithium batteries. Here, we report a completely new approach to enhance Li+ extraction and transport in LiCoPO4 through Fe doping. We show that preferential Fe occupation of the 4c sites suppresses 4a–4c antisite mixing of Li and Co, thereby stabilizing the olivine structure by compensating for the Co-encapsulating oxygen octahedron shrinkage due to Co2+ oxidation during Li+ extraction. The structural stabilization gives rise to ∼10% higher charge capacity at a two-fold lower resistance than the undoped counterparts besides accelerating the intercalation/extraction kinetics. Our findings provide key atomistic-level insights that pave the way for the rational design and realization of new types of metal-doped cathode materials for lithium batteries and related applications.

Graphical abstract: Structurally stabilized olivine lithium phosphate cathodes with enhanced electrochemical properties through Fe doping

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Publication details

The article was received on 04 Aug 2011, accepted on 08 Sep 2011 and first published on 06 Oct 2011


Article type: Paper
DOI: 10.1039/C1EE02283K
Citation: Energy Environ. Sci., 2011,4, 4978-4983
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    Structurally stabilized olivine lithium phosphate cathodes with enhanced electrochemical properties through Fe doping

    Y. Kang, Y. Kim, M. Oh, R. Yin, Y. Lee, D. Han, H. Kwon, J. H. Kim and G. Ramanath, Energy Environ. Sci., 2011, 4, 4978
    DOI: 10.1039/C1EE02283K

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