Three-Dimensional, Fibrous Lithium Iron Phosphate Structures Deposited by Magnetron Sputtering

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• 作者：Aiko B眉nting ; Sven Uhlenbruck ; Doris Sebold ; H. P. Buchkremer ; R. Va脽en
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：October 14, 2015
• 年：2015
• 卷：7
• 期：40
• 页码：22594-22600
• 全文大小：498K
• ISSN：1944-8252

文摘

Crystalline, three-dimensional (3D) structured lithium iron phosphate (LiFePO₄) thin films with additional carbon are fabricated by a radio frequency (RF) magnetron-sputtering process in a single step. The 3D structured thin films are obtained at deposition temperatures of 600 掳C and deposition times longer than 60 min by using a conventional sputtering setup. In contrast to glancing angle deposition (GLAD) techniques, no tilting of the substrate is required. Thin films are characterized by X-ray diffraction (XRD), Raman spectrospcopy, scanning electron microscopy (SEM), cyclic voltammetry (CV), and galvanostatic charging and discharging. The structured LiFePO₄ + C thin films consist of fibers that grow perpendicular to the substrate surface. The fibers have diameters up to 500 nm and crystallize in the desired olivine structure. The 3D structured thin films have superior electrochemical properties compared with dense two-dimensional (2D) LiFePO₄ thin films and are, hence, very promising for application in 3D microbatteries.