New ternary molten salt electrolyte based on alkali metal triflates |
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| Authors: | Xiaohua Tu Youqun Chu and Chunan Ma |
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| Institution: | (1) State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou, 310032, Zhejiang, China; |
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| Abstract: | A novel molten salt electrolyte composed of lithium triflate (CF3SO3Li, LiTf), sodium triflate (CF3SO3Na, NaTf), and potassium triflate (CF3SO3K, KTf) has been prepared and characterized by thermogravimetry/differential thermal analysis (TG/DTA), electrochemical impedance
spectroscopy (EIS), and cyclic voltammetry. TG/DTA shows that the electrolyte was thermally stable when the temperature was
under 400 °C. Its thermal stability gradually decreased with increase of LiTf concentration. The ionic conductivity of molten
salt electrolyte has been evaluated by EIS and its value exceeds 10−2 Scm−1 in the temperature range from 230 to 270 °C. The electrochemical window of the electrolyte at the molar ratio of 0.5/1/1
is about 4.7 V at 250 °C. This electrolyte with low melting point exhibits promising characteristics for high-temperature
lithium batteries. |
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