A Gel鈥揚olymer Sn鈥揅/LiMn0.5Fe0.5PO4 Battery Using a Fluorine-Free Salt

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• 作者：Daniele Di Lecce ; Chiara Fasciani ; Bruno Scrosati ; Jusef Hassoun
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 30, 2015
• 年：2015
• 卷：7
• 期：38
• 页码：21198-21207
• 全文大小：574K
• ISSN：1944-8252

文摘

Safety and environmental issues, because of the contemporary use of common liquid electrolytes, fluorinated salts, and LiCoO₂-based cathodes in commercial Li-ion batteries, might be efficiently mitigated by employing alternative gel鈥損olymer battery configurations and new electrode materials. Herein we study a lithium-ion polymer cell formed by combining a LiMn_0.5Fe_0.5PO₄ olivine cathode, prepared by simple solvothermal pathway, a nanostructured Sn鈥揅 anode, and a LiBOB-containing PVdF-based gel electrolyte. The polymer electrolyte, here analyzed in terms of electrochemical stability by impedance spectroscopy (EIS) and voltammetry, reveals full compatibility for cell application. The LiBOB electrolyte salt and the electrochemically delithiaded Mn_0.5Fe_0.5PO₄ have a higher thermal stability compared to conventional LiPF₆ and Li_0.5CoO₂, as confirmed by thermogravimetric analysis (TGA) and by galvanostatic cycling at high temperature. LiMn_0.5Fe_0.5PO₄ and Sn鈥揅, showing in lithium half-cell a capacity of about 120 and 350 mAh g^鈥?, respectively, within the gelled electrolyte configuration are combined in a full Li-ion polymer battery delivering a stable capacity of about 110 mAh g^鈥?, with working voltage ranging from 2.8 to 3.6 V.