A polyethylene glycol-assisted carbothermal reduction method to synthesize LiFePO(4) using industrial raw materials

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Title:	A polyethylene glycol-assisted carbothermal reduction method to synthesize LiFePO(4) using industrial raw materials
Authors:	Fey,GTK;Huang,KP;Kao,HM;Li,WH
Contributors:	化學工程與材料工程學系
Keywords:	LITHIUM-ION BATTERIES;COMPOSITE CATHODE MATERIALS;CARBON COATING THICKNESS;ELECTROCHEMICAL PROPERTIES;ELECTRONIC-STRUCTURE;PERFORMANCE;TEMPERATURE;CAPACITY;NETWORK;CELLS
Date:	2011
Issue Date:	2012-03-27 16:26:28 (UTC+8)
Publisher:	國立中央大學
Abstract:	Olivine LiFePO(4) is synthesized by a carbothermal reduction method (CTR) using industrial raw materials with polyethylene glycol (PEG) as a reductive agent and carbon source. A required amount of acetone is added to the starting materials for the ball milling process and the precursor is sintered at 973 K for 8 h to form crystalline phase LiFePO(4). The structure and morphology of the LiFePO(4)/C composite samples have been characterized by X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy, energy-dispersive spectroscopy, differential scanning calorimetry and magnetic susceptibility. Electrochemical measurements show that the LiFePO(4)/C composite cathode delivers an initial discharge capacity of 150 mAh g(-1) at a 0.2C-rate between 4.0 and 2.8 V. and almost no capacity loss is observed for up to 50 cycles. Remarkably, the cell can sustain a 30C-rate between 4.6 and 2.0V, and this rate capability is equivalent to charge or discharge in 2 min. The simple technique, low-cost starting materials, and excellent electrochemical performance make this process easier to commercialize than other synthesized methods. (C) 2010 Elsevier B.V. All rights reserved.
Relation:	JOURNAL OF POWER SOURCES
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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