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Low-Temperature lonothermal Synthesis of Li-Ion Conductive Li4B7O12Cl Solid-State Electrolyte

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Ruck,  Michael
Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Tan, D., Wang, F., Pietsch, T., Grasser, M. A., Doert, T., & Ruck, M. (2019). Low-Temperature lonothermal Synthesis of Li-Ion Conductive Li4B7O12Cl Solid-State Electrolyte. ACS Applied Energy Materials, 2(7), 5140-5145. doi:10.1021/acsaem.9b00812.


Cite as: http://hdl.handle.net/21.11116/0000-0004-7816-D
Abstract
Li-ion conductive polycrystalline Li4B7O12Cl to be used as a solid-state electrolyte was successfully synthesized by an ionothermal route at a low temperature. The reaction of lithium acetate dihydrate, boric acid, and copper(II) chloride dihydrate in trihexyltetradecylphosphonium chloride at 130 degrees C led to single-phase Li4B7O12Cl within 10 h. Li4B7O12Br was also successfully synthesized in a similar way. The ionic conductivity, activation energy, and electrochemical window of Li4B7O12Cl electrolyte were measured. A relatively high ionic conductivity of 3 X 10(-4) S cm(-1) at room temperature was detected. A linear sweep voltammogram of the Li4B7O12Cl electrolyte exhibited an electrochemical stability of up to 4.3 V vs. Li/Li+ under the measured conditions. The fabricated {Li Li4B7O12Cl parallel to Li} symmetrical cell exhibits a relatively low voltage hysteresis of 120 mV for 60 cycles.