Ni-doped Bi 2 O 2 CO 3 nanosheet with H + /Zn 2+ co-insertion for "rocking chair" zinc-ion battery

• Published in: Journal of colloid and interface science Vol. 645; p. 483
• Main Authors: Han, Mengwei, Qian, Yuzhu, Li, Xinni, Wang, Nailiang, Song, Ting, Liu, Li, Wang, Xianyou, Wu, Xiongwei, Law, Man-Kay, Long, Bei
• Format: Journal Article
• Language: English
• Published: United States 01.09.2023
• ISSN: 1095-7103

Developing insertion-type anode is key to advancing "rocking chair" zinc-ion batteries, though there are few reported insertion-type anodes. Herein, the Bi O CO is a high-potential anode, with a special layered structure. A one-step hydrothermal method was used to prepare Ni-doped Bi O CO nanosheet, and also a free-standing electrode consisting of Ni-Bi O CO and CNTs was designed. Both cross-linked CNTs conductive networks and Ni doping improve charge transfer. Ex situ tests (XRD, XPS, TEM, etc.) reveal the H /Zn co-insertion mechanism of Bi O CO and that Ni doping improves its electrochemical reversibility and structural stability. Therefore, this optimized electrode offers a high specific capacity of 159 mAh g at 100 mA g , a suitable average discharge voltage of ≈0.400 V, and a long-term cycling stability of 2200 cycles at 700 mA g . Besides, the Ni-Bi O CO //MnO "rocking chair" zinc-ion battery (based on the total mass of cathode and anode) delivers a high capacity of ≈100 mAh g at 50.0 mA g . This work provides a reference for designing high-performance anode in zinc-ion batteries.