Conductive Polymer-Coated VS4 Submicrospheres As Advanced Electrode Materials in Lithium-Ion Batteries

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• 作者：Yanli Zhou ; Yanlu Li ; Jing Yang ; Jian Tian ; Huayun Xu ; Jian Yang ; Weiliu Fan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：8
• 期：29
• 页码：18797-18805
• 全文大小：636K
• 年卷期：0
• ISSN：1944-8252

文摘

VS₄ as an electrode material in lithium-ion batteries holds intriguing features like high content of sulfur and one-dimensional structure, inspiring the exploration in this field. Herein, VS₄ submicrospheres have been synthesized via a simple solvothermal reaction. However, they quickly degrade upon cycling as an anode material in lithium-ion batteries. So, three conductive polymers, polythiophene (PEDOT), polypyrrole (PPY), and polyaniline (PANI), are coated on the surface to improve the electron conductivity, suppress the diffusion of polysulfides, and modify the interface between electrode/electrolyte. PANI is the best in the polymers. It improves the Coulombic efficiency to 86% for the first cycle and keeps the specific capacity at 755 mAh g^–1 after 50 cycles, higher than the cases of naked VS₄ (100 mAh g^–1), VS₄@PEDOT (318 mAh g^–1), and VS₄@PPY (448 mAh g^–1). The good performances could be attributed to the improved charge-transfer kinetics and the strong interaction between PANI and VS₄ supported by theoretical simulation. The discharge voltage ∼2.0 V makes them promising cathode materials.