Few‐Atomic‐Layered Co‐Doped BiOBr Nanosheet: Free‐Standing Anode with Ultrahigh Mass Loading for “Rocking Chair” Zinc‐Ion Battery

• DOI: 10.1002/advs.202204087
• Publication Date: 2022-09-14T01:56:35Z
• Authors: Bei Long; Qing Zhang; Tengfei Duan; Ting Song; Yong Pei; Xianyou Wang; Chunyi Zhi; Xiongwei Wu; Qianyu Zhang; Yuping Wu
• Keywords: Nanosheet

Insertion host materials are considered as a candidate to replace metallic Zn anode. However, the high mass loading anode with good electrochemical performances is reported rarely. Herein, few-atomic-layered Co-doped BiOBr nanosheet (Co-UTBiOBr) prepared via one-step hydrothermal method and free-standing flexible electrode consisting of Co-UTBiOBr CNTs designed. Ultrathin (3 atomic layers) accelerate Zn2+ electron transfer respectively. The Co-doping conducive reduced diffusion barrier, improved volume expansion after intercalation, enhanced electronic conductivity BiOBr, verified by experimental theoretical studies. An insertion-conversion mechanism proposed according ex situ characterizations. Benefiting from many advantages, displays capacity 150 mAh g-1 at 0.1 A long-term cyclic life ≈100% attention over 3000 cycles 1 . Remarkably, excellent maintained even an ultrahigh 15 mg cm-2 Co-UTBiOBr//MnO2 "rocking chair" zinc-ion battery exhibits stable ≈130 0.2 during test its quasi-solid-state shows outstanding stability under various bending states. This work provides new idea for designing