An Enhanced High-Rate Na3V2(PO4)3-Ni2P Nanocomposite Cathode with Stable Lifetime for Sodium-Ion Batteries

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• 作者：Jinju Song ; Sohyun Park ; Vinod Mathew ; Jihyeon Gim ; Sungjin Kim ; Jeonggeun Jo ; Seokhun Kim ; Muhammad Hilmy Alfaruqi ; Joseph Paul Baboo ; In-Ho Kim ; Sun-Ju Song ; Jaekook Kim
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：December 28, 2016
• 年：2016
• 卷：8
• 期：51
• 页码：35235-35242
• 全文大小：593K
• ISSN：1944-8252

文摘

Herein, we report on a high-discharge-rate Na₃V₂(PO₄)₃-Ni₂P/C (NVP-NP/C) composite cathode prepared using a polyol-based pyro synthesis for Na-ion battery applications. X-ray diffraction and electron microscopy studies established the presence of Na₃V₂(PO₄)₃ and Ni₂P, respectively, in the NVP-NP/C composite. As a cathode material, the obtained NVP-NP/C composite electrode exhibits higher discharge capacities (100.8 mAhg^–1 at 10.8 C and 73.9 mAhg^–1 at 34 C) than the NVP/C counterpart electrode (62.7 mAhg^–1 at 10.8 C and 4.7 mAhg^–1 at 34 C), and the composite electrode retained 95.3% of the initial capacity even after 1500 cycles at 16 C. The enhanced performance could be attributed to the synergetic effect of the Ni₂P phase and nanoscale NVP particles, which ultimately results in noticeably enhancing the electrical conductivity of the composite. The present study thus demonstrates that the Na₃V₂(PO₄)₃-Ni₂P/C nanocomposite is a prospective candidate for NIB with a high power/energy density.