Tris(pentafluorophenyl)borane as an Electrolyte Additive to Improve the High Temperature Cycling Performance of LiFePO4 Cathode

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Title:	Tris(pentafluorophenyl)borane as an Electrolyte Additive to Improve the High Temperature Cycling Performance of LiFePO4 Cathode
Authors:	Chang,CC;Chen,TK;Her,LJ;Fey,GTK
Contributors:	化學工程與材料工程學系
Keywords:	LITHIUM-ION BATTERIES;VINYLENE CARBONATE;ANION RECEPTOR;SPINEL;BORANE;CELLS
Date:	2009
Issue Date:	2010-06-29 17:28:23 (UTC+8)
Publisher:	中央大學
Abstract:	The capacity fading of LiFePO4 batteries using 1.2 mol dm(-3) LiPF6 ethylene carbonate/dimethyl carbonate electrolyte with tris (pentafluorophenyl) borane (TPFPB) additive at 60 degrees C is investigated by cyclic voltammetry, cyclability, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). The cyclability results show that the LiFePO4-Li cell with the TPFPB additive electrolytes exhibits high discharge capacity and good cycling performance at 60 degrees C. The LiFePO4 electrode cycled at 60 degrees C without the TPFPB additive shows a significant increase in charge-transfer resistance by EIS analysis. The TPFPB additive in the electrolyte reduces the difference in the charge-transfer resistance before and after 100 cycles at elevated temperatures. SEM results show that after 100 cycles at 60 degrees C in an electrolyte without TPFPB additive, the LiFePO4 electrode forms a visible material on the electrode surface. The observed material is presumably related with capacity fading in the LiFePO4-Li cell. The results indicate that TPFPB in the electrolyte prevents the formation of the observed material on the electrode, reduces charge-transfer resistance, and enhances cycling performance of the LiFePO4-Li cells at 60 degrees C. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3205861] All rights reserved.
Relation:	JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Appears in Collections:	[National Central University Department of Chemical & Materials Engineering] journal & Dissertation

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