Mediating Zn Ions Migration Behavior via β-Cyclodextrin Modified Carbon Nanotube Film for High-Performance Zn Anodes
Lingzhi Kang, Ke Yue, Cong Ma, Huadong Yuan, Jianmin Luo, Yao Wang, Yujing Liu, Jianwei Nai, Xinyong Tao
Abstract
Metallic Zn is considered as a promising anode material because of its abundance, eco-friendliness, and high theoretical capacity. However, the uncontrolled dendrite growth and side reactions restrict its further practical application. Herein, we proposed a β-cyclodextrin-modified multiwalled carbon nanotube (CD-MWCNT) layer for Zn metal anodes. The obtained CD-MWCNT layer with high affinity to Zn can significantly reduce the transfer barrier of Zn 2+ at the electrode/electrolyte interface, facilitating the uniform deposition of Zn 2+ and suppressing water-caused side reactions. Consequently, the Zn||Zn symmetric cell assembled with CD-MWCNT shows a significantly enhanced cycling durability, maintaining a cycling life exceeding 1000 h even under a high current density of 5 mA cm –2 . Furthermore, the full battery equipped with a V 2 O 5 cathode displays an unparalleled long life. This work unveils a promising avenue toward the achievement of high-performance Zn metal anodes.