The effects of lithium bis(fluorosulfonyl)imide, Li[N(SO2F)2] (LiFSI), as an additive on the low-temperature performance of graphiteLiCoO2 pouch cells are investigated. The cell, which includes 0.2M LiFSI salt additive in the 1M lithium hexafluorophosphate (LiPF6)-based conventional electrolyte, outperforms the one without additive under −20 °C and high charge cutoff voltage of 4.3 V, delivering higher discharge capacity and promoted rate performance and cycling stability with the reduced change in interfacial resistance. Surface analysis results on the cycled LiCoO2 cathodes and cycled graphite anodes extracted from the cells provide evidence that a LiFSI-induced improvement of high-voltage cycling stability at low temperature originates from the formation of a less resistive solid electrolyte interphase layer, which contains plenty of LiFSI-derived organic compounds mixed with inorganics that passivate and protect the surface of the cathode and anode from further electrolyte decomposition and promotes Li+ ion-transport kinetics despite the low temperature, inhibiting Li metal-plating at the anode. The results demonstrate the beneficial effects of the LiFSI additive on the performance of a lithium-ion battery for use in battery-powered electric vehicles and energy storage systems in cold climates and regions.
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7 March 2020
Research Article|
March 04 2020
Interface stabilization via lithium bis(fluorosulfonyl)imide additive as a key for promoted performance of graphiteLiCoO2 pouch cell under C
Special Collection:
Interfacial Structure and Dynamics for Electrochemical Energy Storage
Hieu Quang Pham
;
Hieu Quang Pham
a)
1
Department of Chemical Engineering and Applied Chemistry, Chungnam National University
, Daejeon 34134, South Korea
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Gyeong Jun Chung;
Gyeong Jun Chung
1
Department of Chemical Engineering and Applied Chemistry, Chungnam National University
, Daejeon 34134, South Korea
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Jisoo Han;
Jisoo Han
1
Department of Chemical Engineering and Applied Chemistry, Chungnam National University
, Daejeon 34134, South Korea
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Eui-Hyung Hwang;
Eui-Hyung Hwang
2
Lichem Co., Ltd.
, Geumsan 32715, South Korea
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Young-Gil Kwon;
Young-Gil Kwon
2
Lichem Co., Ltd.
, Geumsan 32715, South Korea
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Seung-Wan Song
Seung-Wan Song
b)
1
Department of Chemical Engineering and Applied Chemistry, Chungnam National University
, Daejeon 34134, South Korea
b)Author to whom correspondence should be addressed: swsong@cnu.ac.kr. Tel.: +82-42-821-7008. Fax: +82-42-822-6637
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a)
Present address: Electrochemistry Laboratory, Paul Scherrer Institute, 5232 Villigen, Switzerland.
b)Author to whom correspondence should be addressed: swsong@cnu.ac.kr. Tel.: +82-42-821-7008. Fax: +82-42-822-6637
Note: This paper is part of the JCP Special Topic on Interfacial Structure and Dynamics for Electrochemical Energy Storage.
J. Chem. Phys. 152, 094709 (2020)
Article history
Received:
January 02 2020
Accepted:
February 12 2020
Citation
Hieu Quang Pham, Gyeong Jun Chung, Jisoo Han, Eui-Hyung Hwang, Young-Gil Kwon, Seung-Wan Song; Interface stabilization via lithium bis(fluorosulfonyl)imide additive as a key for promoted performance of graphiteLiCoO2 pouch cell under C. J. Chem. Phys. 7 March 2020; 152 (9): 094709. https://doi.org/10.1063/1.5144280
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