Lithium-ion Battery.pdf

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Lithium-ion Battery

Electrochimica Acta 165 (2015) 67–71Bis(2,2,2-Trifluoroethyl) Ethylphosphonate as Novel High-efficient Flame Retardant Additive for Safer Lithium-ion Battery Xiaoming Zhu a,c, Xiaoyu Jiang b, Xinping Ai b, Hanxi Yang b, Yuliang Cao b,* aHubei Collaboration Innovation Center of Non-power Nuclear Technology, Hubei University of Science and Technology, Xianning 437100, PR China bCollege of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, PR China c School of Nuclear Technology Chemistry and Biology, Hubei University of Science and Technology, Xianning 437100, PR China A R T I C L E I N F O Article history: Received 5 January 2015 Received in revised form 11 February 2015 Accepted 28 February 2015 Available online 3 March 2015 Keywords: Fluorinated phosphates Flame retardant Safety Lithium ion batteries A B S T R A C T Bis(2,2,2-Trifluoroethyl) ethylphosphonate (TFEP) is first synthesized as a flame retardant additive for conventional carbonate electrolyte to improve the safety of lithium ion batteries. The inflammability and electrochemical stability of the TFEP containing electrolyte are studied. The self-extinguishing time test shows that TFEP provides a significant suppression of the flammability of the electrolyte. When adding 20% TFEP, the electrolyte cannot be ignited, exhibiting superior flame retardancy. Cyclic voltammetry and electrochemical charge/discharge tests show that TFEP has insignificant impact on the electrodes’ electrochemical performance. The results demonstrate that TFEP can be used as a novel highly effective safety additive for lithium ion batteries. ? 2015 Elsevier Ltd. All rights reserved. Contents lists available at ScienceDirect Electrochimica Acta journa l home page : www.e l sev ier .com/ loca te /e le cta cta1. Introduction Lithium ion batteries have been widely used as power source for portable electronic devices such as cameras, laptops, cellphones, etc. due to its high energy density. The further extension of lithium i

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