BiOI Nanopaper As a High-Capacity, Long-Life and Insertion-Type Anode for a Flexible Quasi-Solid-State Zn-Ion Battery

• Published in: ACS applied materials & interfaces 2022-06, Vol.14 (22), p.25516-25523
• Main Authors: Zhang, Qing, Duan, Tengfei, Xiao, Manjun, Pei, Yong, Wang, Xianyou, Zhi, Chunyi, Wu, Xiongwei, Long, Bei, Wu, Yuping
• Format: Article
• Language: English
• Subjects: Energy, Environmental, and Catalysis Applications
• ISSN: 1944-8244; 1944-8252
• DOI: 10.1021/acsami.2c04946

The development of intercalation anodes with high capacity is key to promote the progress of “rocking-chair” Zn-ion batteries (ZIBs). Here, layered BiOI is considered as a promising electrode in ZIBs due to its large interlayer distance (0.976 nm) and low Zn2+ diffusion barrier (0.57 eV) obtained by density functional theory, and a free-standing BiOI nanopaper is designed. The process and mechanism of Zn­(H2O) n 2+ insertion in BiOI are proved by ex situ X-ray diffraction, Raman, and X-ray photoelectron spectroscopy. The suitable potential (0.6 V vs Zn/Zn2+), high reversible capacity (253 mAh g–1), good rate performance (171 mAh g–1 at 10 A g–1), long cyclic life (113 mAh g–1 after 5000 cycles at 5 A g–1), and dendrite-free operation of BiOI nanopaper prove its potential as a superior anode. When it is coupled with Mn3O4 cathode, the quasi-solid-state battery exhibits a high initial capacity of 149 mAh g–1 (for anode) and a good capacity retention of 70 mAh g–1 after 400 cycles. The self-assembled flexible battery also shows stable charge–discharge during the cyclic test. This work shows the feasibility of BiOX anode for dendrite-free ZIBs.