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[Display omitted] • The Ni-doped Bi 2 O 2 CO 3 nanosheet is prepared as insertion-type anode of "rocking chair" AZIBs. • The cross-linked CNTs conductive network improves the electronic conductivity and structure stability of electrode. • The Ni doping enhances the electronic/ionic transmission and electrochemcial reversibility of Bi 2 O 2 CO 3. • The H+/Zn2+ co-insertion mechanism of Bi 2 O 2 CO 3 is proved via ex situ XRD and XPS. • Ni-Bi 2 O 2 CO 3 //MnO 2 "rocking chair" AZIBs exhibit high reversible capacity. Developing insertion-type anode is key to advancing "rocking chair" zinc-ion batteries, though there are few reported insertion-type anodes. Herein, the Bi 2 O 2 CO 3 is a high-potential anode, with a special layered structure. A one-step hydrothermal method was used to prepare Ni-doped Bi 2 O 2 CO 3 nanosheet, and also a free-standing electrode consisting of Ni-Bi 2 O 2 CO 3 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+/Zn2+ co-insertion mechanism of Bi 2 O 2 CO 3 and that Ni doping improves its electrochemical reversibility and structural stability. Therefore, this optimized electrode offers a high specific capacity of 159 mAh g−1 at 100 mA g−1, a suitable average discharge voltage of ≈0.400 V, and a long-term cycling stability of 2200 cycles at 700 mA g−1. Besides, the Ni-Bi 2 O 2 CO 3 //MnO 2 "rocking chair" zinc-ion battery (based on the total mass of cathode and anode) delivers a high capacity of ≈100 mAh g−1 at 50.0 mA g−1. This work provides a reference for designing high-performance anode in zinc-ion batteries. [ABSTRACT FROM AUTHOR]