Control of LiFePO₄ air-aging through the use of electrolyte additive

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• 作者：Marine Cuisinier ; Nicolas Dupr茅 ; Dominique Guyomard
• 关键词：LiFePO4 ; Lithium battery ; Interface ; Additive
• 刊名：Electrochemistry Communications
• 出版年：January, 2014
• 年：2014
• 卷：38
• 期：Complete
• 页码：138-141
• 全文大小：501 K

文摘

Air-aged LiFePO₄ exhibits an OH-rich surface that reacts with LiPF₆ based electrolyte, leading to poor battery performance. We show that outstanding electrochemical performance is achieved when using air-aged LiFePO₄ in the presence of electrolyte additive N,N-diethylamino trimethylsilane, capable of reacting with acidic impurities. Stable impedance is obtained upon cycling, and ⁷Li and ¹⁹F MAS NMR study indicates that the interphasial chemistry is governed by a surface layer coming from reacted additive.