Synthesis and characterization of high power LiFePO₄/C nano-plate thin films

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• 作者：Nan Zhou^a ; ^b ; Yanyi Liu^a ; Jiangang Li^a ; ^c ; Evan Uchaker^a ; Suqin Liu^b ; Kelong Huang^b ; Guozhong Cao^a ; ^{gzcao@u.washington.edu}
• 关键词：Thin film cathode ; Lithium iron phosphate ; Lithium ion battery ; Solvothermal growth ; Nano-carbon coating
• 刊名：Journal of Power Sources
• 出版年：2012
• 期刊代码：58_03787753
• 类别：ce
• 出版时间：1 September, 2012
• 卷：213
• 期：Complete
• 页码：100-105
• 文件大小：735 K

摘要

Tunable LiFePO₄/C thin films demonstrating high power were fabricated by drop-casting a LiFePO₄ nano-plate/sucrose suspension on titanium foil, followed by pyrolysis at 600 掳C for 3 h in nitrogen. The thickness, carbon content, and morphology of the LiFePO₄/C film cathode can be adjusted by changing the amount of drop-cast, sucrose solution concentration and LiFePO₄ raw material. For this work, well-crystallized LiFePO₄ nano-plates synthesized via solvothermal route were used to prepare high power LiFePO₄/C thin films. The resultant binder-free films consisted of well-packed LiFePO₄ nano-plates coated with nano-carbon, a result of sucrose pyrolysis, and were directly assembled into cells for testing. The LiFePO₄/C nano-composite film cathode delivered a lithium ion intercalation capacity of 162 mAh g^鈭? and 90 mAh g^鈭? at current density of 170 mA g^鈭? (1 C) and 1.7 A g^鈭? (10 C), respectively, while demonstrating excellent cyclic stability.