Characterization of N-methyl-N-butylpyrrolidinium Bis(trifluoromethanesulfonyl)imide-LiTFSI-Tetra(ethylene glycol) dimethyl ether mixtures as a li metal cell electrolyte
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作者:
Shin, Joon Ho
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Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USALawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA
Shin, Joon Ho
[1
]
Cairns, Elton J.
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Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA
Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USALawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA
Cairns, Elton J.
[1
,2
]
机构:
[1] Lawrence Berkeley Natl Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Dept Chem Engn, Berkeley, CA 94720 USA
We have employed tetra(ethylene glycol)dimethyl ether (TEGDME) as a polymer solvent in mixed electrolytes composed of N-methyl-n-butyl pyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14TFSI), LiTFSI, and TEGDME and characterized their physical and electrochemical properties as well as the cyclability of Li/S cells with PYR14TFSI+x LiTFSI (x=moles LiTFSI/kg PYR14TFSI)+y TEGDME (y=kg TEGDME/kg PYR14TFSI) electrolyte. The addition of the TEGDME polymer solvent to the PYR14TFSI+0.2 m LiTFSI+y TEGDME mixtures resulted in a significant enhancement of ionic conductivity, particularly at lower temperatures. Interfacial impedance and galvanostatic Li cycling measurements show that the PYR14TFSI+0.2 m LiTFSI+y TEGDME ternary mixture exhibits excellent compatibility with Li metal electrodes. The use of the ternary mixture as an electrolyte in a Li/S cell provided good charge and discharge capability of the cell at room temperature with a discharge capacity of 887 mAh/g sulfur at 0.054 mA/cm(2) and at low temperature (similar to 0 degrees C) with a discharge capacity of about 440 mAh/g sulfur at 0.033 mA/cm(2) for the first cycle, respectively (theoretical specific capacity 1672 mAh/g sulfur). In addition, the cell tested at 0 degrees C exhibited a stable cyclability after the 5th cycle, with a discharge capacity of 248 mAh/g sulfur for the 20th cycle. (c) 2008 The Electrochemical Society.
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Cheon, SE
;
Choi, SS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Choi, SS
;
Han, JS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Han, JS
;
Choi, YS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Choi, YS
;
Jung, BH
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Jung, BH
;
Lim, HS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
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ENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, ItalyENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, Italy
Henderson, WA
;
Passerini, S
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ENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, ItalyENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, Italy
机构:
Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Cheon, SE
;
Choi, SS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Choi, SS
;
Han, JS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Han, JS
;
Choi, YS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Choi, YS
;
Jung, BH
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
Jung, BH
;
Lim, HS
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Samsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South KoreaSamsung SDI Co Ltd, Ctr Corp Res & Dev, Yongin 449577, Gyeonggi Do, South Korea
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ENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, ItalyENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, Italy
Henderson, WA
;
Passerini, S
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ENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, ItalyENEA, Italian Natl Agcy New Technol Energy & Environm, Casaccia Res Ctr, I-00060 Rome, Italy