Li-ion conductivity and stability of hot-pressed LiTa 2 PO 8 solid electrolyte for all-solid-state batteries
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Li-ion conductivity and stability of hot-pressed LiTa2PO8 solid electrolyte for all-solid-state batteries Bing Huang1,2, Biyi Xu3, Jingxi Zhang2, Zhihong Li1,*, Zeya Huang2, Yutao Li3,*, and Chang-An Wang2,4,* 1
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China 2 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People’s Republic of China 3 Materials Science and Engineering Program, Texas Materials Institute, The University of Texas At Austin, Austin, TX 78712, USA 4 School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, Henan, People’s Republic of China
Received: 22 June 2020
ABSTRACT
Accepted: 8 September 2020
Solid-state electrolyte as a crucial component in all-solid-state batteries should have high Li-ion conductivity and good stability in air. Recently, a new solid Liion conductor LiTa2PO8 (LTPO) with theoretical and experimental Li-ion conductivities of 35.3 and 0.25 mS/cm has been reported. Herein, we systematically investigate the ionic conductivity and chemical stability of the LTPO electrolytes sintered by conventional sintering (CS) and hot-pressing sintering (HP) methods. The effects of Li sources, sintering temperature, and the dwelling time are concerned. LTPO pellets using CH3COOLi2H2O as the Li source sintered by CS method have a room-temperature Li-ion conductivity of 1.86 9 10–4 S/cm with an activation energy of 0.36 eV. A conductivity of 3.12 9 10–4 S/cm with an activation energy of 0.32 eV is achieved by further HP sintering. Moreover, LTPO shows excellent chemical stabilities in air, aqueous solution, and organic solvent and shows a stable cycling performance in the symmetric Li/Li cells and the all-solid-state Li/LiFePO4 batteries with the separation of a thin PEO membrane.
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Springer Science+Business
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Introduction Rechargeable Li-ion batteries with liquid electrolytes have been widely used in portable electronic devices, electric vehicles, etc. However, the safety issues,
energy density, and cycle life limit their large-scale applications [1–4]. All-solid-state Li-ion batteries by replacing the flammable liquid electrolytes with solid Li-ion conductors can overcome the challenges for commercial Li-ion batteries: the severe safety
Handling Editor: Kyle Brinkman.
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https://doi.org/10.1007/s10853-020-05324-9
J Mater Sci
concerns (such as flammability and thermal runaway) and the energy density requirements (enabling the use of Li metal anode and high-voltage cathodes) [5–8]. Solid-state Li-ion conductors should have: (1) exceptionally high ionic conductivities (* 10–4 S/cm at room temperature) but negligible electronic conduction; (2) good chemical/electrochemical stability with elec
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