Ascorbic Acid-Assisted Synthesis of Mesoporous Sodium Vanadium Phosphate Nanoparticles with Highly sp2-Coordinated Carbon Coatings as Efficient Cathode Materials for Rechargeable Sodium-Ion Batteries

详细信息    查看全文

• 作者：Dr. Tai-Feng Hung ; Wei-Jen Cheng ; Dr. Wen-Sheng Chang ; Dr. Chang-Chung Yang ; Dr. Chin-Chang Shen and Dr. Yu-Lin Kuo
• 刊名：Chemistry - A European Journal
• 出版年：2016
• 出版时间：July 18, 2016
• 年：2016
• 卷：22
• 期：30
• 页码：10620-10626
• 全文大小：1606K
• ISSN：1521-3765

文摘

Herein, mesoporous sodium vanadium phosphate nanoparticles with highly sp²-coordinated carbon coatings (meso-Na₃V₂(PO₄)₃/C) were successfully synthesized as efficient cathode material for rechargeable sodium-ion batteries by using ascorbic acid as both the reductant and carbon source, followed by calcination at 750 °C in an argon atmosphere. Their crystalline structure, morphology, surface area, chemical composition, carbon nature and amount were systematically explored. Following electrochemical measurements, the resultant meso-Na₃V₂(PO₄)₃/C not only delivered good reversible capacity (98 mAh g⁻¹ at 0.1 A g⁻¹) and superior rate capability (63 mAh g⁻¹ at 1 A g⁻¹) but also exhibited comparable cycling performance (capacity retention: ≈74 % at 450 cycles at 0.4 A g⁻¹). Moreover, the symmetrical sodium-ion full cell with excellent reversibility and cycling stability was also achieved (capacity retention: 92.2 % at 0.1 A g⁻¹ with 99.5 % coulombic efficiency after 100 cycles). These attributes are ascribed to the distinctive mesostructure for facile sodium-ion insertion/extraction and their continuous sp²-coordinated carbon coatings, which facilitate electronic conduction.