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Issue 29, 2011
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Synthesis and electrochemistry of monoclinic Li(MnxFe1−x)BO3: a combined experimental and computational study

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Abstract

The lithium-ion battery is the most advanced energy storage system that has conquered the portable electronics market, but it has been considered unsuitable for large-scale applications such as plug-in hybrid vehicles due to cost, safety, and calendar life issues. Research in materials science is approaching a possible solution to these problems by the combination of abundant Fe as a redox center and covalent (PO4)3oxyanion units with fixed oxygen, leading to the use of LiFePO4 with olivine-type structure as a cathode material. A high level of stability, safety, significant cost reduction, and huge power generation are now on the verge of being guaranteed. Replacing the (PO4)3 anion to smaller and lighter (BO3)3, namely LiMBO3 (M = transition metal) compounds, could possibly increase the theoretical capacity by approximately >1.3 times; however, such systems have not been thoroughly investigated to date. Here we present the successful solid state synthesis of a complete solid solution of Li(MnxFe1−x)BO3 with monoclinic structure and the optimization processes to maximize its performance as a lithium battery cathode. Details of the intrinsic electrode properties, including the phase stability issues as well as degradation mode, are demonstrated, followed by systematic investigation of the reaction mechanisms by ex situX-ray diffraction, Mössbauer spectroscopy, X-ray absorption spectroscopy, and ab initio calculations.

Graphical abstract: Synthesis and electrochemistry of monoclinic Li(MnxFe1−x)BO3: a combined experimental and computational study

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Publication details

The article was received on 16 Mar 2011, accepted on 17 May 2011 and first published on 22 Jun 2011


Article type: Paper
DOI: 10.1039/C1JM11131K
Citation: J. Mater. Chem., 2011,21, 10690-10696
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    Synthesis and electrochemistry of monoclinic Li(MnxFe1−x)BO3: a combined experimental and computational study

    A. Yamada, N. Iwane, S. Nishimura, Y. Koyama and I. Tanaka, J. Mater. Chem., 2011, 21, 10690
    DOI: 10.1039/C1JM11131K

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