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      Lyotropic liquid crystalline mesophases made of salt-acid-surfactant systems for the synthesis of novel mesoporous lithium metal phosphates

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      Author(s)
      Uzunok, Işıl
      Kim, J.
      Çolak, Tuluhan O.
      Kim, D.
      Kim, H.
      Kim, M.
      Yamauchi, Y.
      Dağ, Ömer
      Date
      2019
      Source Title
      ChemPlusChem
      Print ISSN
      2192-6506
      Publisher
      Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim
      Volume
      84
      Issue
      10
      Pages
      1544 - 1553
      Language
      English
      Type
      Article
      Item Usage Stats
      114
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      36
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      Abstract
      Mesoporous lithium metal phosphates are an important class of materials for the development of lithium ion batteries. However, there is a limited success in producing mesoporous lithium metal phosphates in the literature. Here, a lyotropic liquid crystalline (LLC) templating method was employed to synthesize the first examples of LiMPO4 (LMP) of Mn(II), Co(II), and Ni(II). A homogeneous aqueous solution of lithium and transition metal nitrate salts, phosphoric acid (PA), and surfactant (P123) can be spin coated or drop‐cast coated over glass slides to form the LLC mesophases which can be calcined into mesoporous amorphous LMPs (MA‐LMPs). The metal salts of Mn(II), Co(II) and Ni(II) produce MA‐LMPs that crystallize into olivine structures by heat treatment of the LLC mesophase. The Fe(II) compound undergoes air oxidation. Therefore, both Fe(II) and Fe(III) precursors produce a crystalline Li3Fe2(PO4)3 phase at over 400 °C. The MA‐LMPs show no reactivity towards lithium, however the crystalline iron compound exhibits electrochemical reactivity with lithium and a good electrochemical energy storage ability using a lithium‐ion battery test.
      Keywords
      Electrochemical energy storage
      Lithium ion batteries
      Lithium metal phosphates
      Lyotropic liquid crystals
      Mesoporous
      Permalink
      http://hdl.handle.net/11693/53223
      Published Version (Please cite this version)
      https://doi.org/10.1002/cplu.201900435
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