Conductivities of electrolytes based on PEI-b-PEO-b-PEI triblock copolymers with lithium and copper TFSI salts |
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| Institution: | 1. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China;2. State Key Laboratory of Powder Metallurgy, Centre South University, Changsha 410083, Hunan, PR China;3. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, PR China;4. College of Material Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, PR China;5. Huadong Institute of Lithium Ion Battery, Zhangjiagang 215600, Jiangsu, PR China;1. Department of Chemical and Biological Engineering, Hanbat National University, Daejon 305-719, Republic of Korea;2. Research Section of Power Control Devices, Electronics and Telecommunications Research Institute (ETRI), Daejon 305-700, Republic of Korea;1. Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China;2. State Key Laboratory of Chemical Resource Engineering, College of Chemistry, Beijing University of Chemical Technology, Beijing 100871, China |
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| Abstract: | Tri block-copolymer poly(iminoethylene)-b-poly(oxyethylene)-b-poly(iminoethylene) with a poly(oxyethylene) central block (PEI-b-PEO-b-PEI) were used as a “dual” matrix for polymer electrolytes having selectivity for hard cations (Li+/PEO) in one phase and for soft cations (Cu2+/PEI) in the other. Conductivity measurements were recorded for 20:1, 12:1 and 8:1 coordinating atom (O or/and N) to cation (Li+, Cu2+) ratios, for each of the three complexes studied: PEI-b-PEO-LiTFSI-b-PEI, PEI-Cu(TFSI)2-b-PEO-b-PEI-Cu(TFSI)2 and PEI-Cu(TFSI)2-b-PEO-LiTFSI-b-PEI-Cu(TFSI)2. For either low (20 °C) or high temperature (80 °C) the highest conductivity was given by the polymer electrolyte based on Cu(TFSI)2 with N/Cu2+ = 20:1 (10? 6, respectively 2 × 10? 4 S cm? 1). In the present paper, the conductivity evolution is discussed in relation with the polymer structure, the type and the concentration of the salt and the thermal behavior of our systems. |
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