Lyotropic Liquid Crystalline Mesophases Made of Salt-Acid-Surfactant Systems for the Synthesis of Novel Mesoporous Lithium Metal Phosphates

Işıl Uzunok; Jeonghun Kim; Tuluhan O Çolak; Dae Sik Kim; Hansu Kim; Minjun Kim; Yusuke Yamauchi; Ömer Dag

doi:10.1002/cplu.201900435

Lyotropic Liquid Crystalline Mesophases Made of Salt-Acid-Surfactant Systems for the Synthesis of Novel Mesoporous Lithium Metal Phosphates

Chempluschem. 2019 Oct;84(10):1544-1553. doi: 10.1002/cplu.201900435. Epub 2019 Sep 10.

Authors

Işıl Uzunok¹, Jeonghun Kim^{2

3}, Tuluhan O Çolak¹, Dae Sik Kim⁴, Hansu Kim⁴, Minjun Kim³, Yusuke Yamauchi^{2

3

5}, Ömer Dag^{1

6}

Affiliations

¹ Department of Chemistry, Bilkent University, 06800, Ankara, Turkey.
² Key Laboratory of Eco-Chemical Engineering College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China.
³ School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia.
⁴ Department of Energy Engineering, Hanyang University, Seoul, 133-791, Republic of Korea.
⁵ International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan.
⁶ UNAM-National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey.

PMID: 31943931
DOI: 10.1002/cplu.201900435

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 Li₃ Fe₂ (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.

Abstract

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