Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 45, Pages 22478-22482Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta09170f
Keywords
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1D1A1B03935641]
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) from the Ministry of Trade, Industry & Energy, Republic of Korea [2015-4010-200820]
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A new lithium-ion conducting oxide, LiTa2PO8, with a three-dimensional (3D) framework structure was synthesized. The complementary use of synchrotron XRD and neutron diffraction revealed that LiTa2PO8 crystallized into a monoclinic system (space group C2/c) with lattice parameters a approximate to 9.716 angstrom, b approximate to 11.536 angstrom, c approximate to 10.697 angstrom, and = 90.04 degrees. In this structure, the TaO6 octahedra and PO4 tetrahedra are connected via corner-sharing to form an unprecedented anionic framework, [(TaO6/2)(2)(PO4/2)](-), providing a 3D pathway for lithium-ion conduction. The sintered LiTa2PO8 pellets exhibited excellent lithium-ion conductivities: bulk conductivity of 1.6 x 10(-3) S cm(-1) and total conductivity of 2.5 x 10(-4) S cm(-1) at 25 degrees C.
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