期刊
ELECTROCHIMICA ACTA
卷 136, 期 -, 页码 182-188出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.05.054
关键词
Polydimethylsiloxane; Electrolyte additives; Low-temperature behavior; Lithium-ion battery
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Korean Ministry of Education [2013R1A1A2061288]
- Technology Development Program for Strategic Core Materials - Korean Ministry of Trade, Industry Energy [10047758]
- Converging Research Center Program through the Korean Ministry of Science, ICT and Future Planning [2013K000218]
- National Research Foundation of Korea [2013R1A1A2061288] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Three kinds of polydimethylsiloxane (PDMS)-based grafted and ungrafted copolymers such as poly[dimethylsiloxane-co-(siloxane-g-acrylate)] (PDMS-A), poly(dimethylsiloxane-co-phenylsiloxane) (PDMS-P), and poly[dimethylsiloxane-co-(siloxane-g-ethylene oxide)] (PDMS-EO) are used as additives to standard liquid electrolyte solutions to enhance the lithium-ion battery performance at low temperatures. Liquid electrolyte solutions with PDMS-based additives are electrochemically stable under 5.0 V and have adequate ionic conductivities of 10(-4) S cm(-1) at -20 degrees C. Particularly, liquid electrolytes with PDMS-P and PDMS-EO exhibit higher ionic conductivities of around 5 x 10(-4) S cm(-1) at -20 degrees C, indicating a specific resisting property against the freezing of the liquid electrolyte components. As a result, the addition of PDMS-based additives to liquid electrolytes improves the capacity retention ratio and rate-capability of lithium-ion batteries at low temperatures. (C) 2014 Elsevier Ltd. All rights reserved.
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