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

Abstract

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 Zn 2+ diffusion barrier (0.57 eV) obtained by density functional theory, and a free-standing BiOI nanopaper is designed. The process and mechanism of Zn(H 2 O) 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/Zn 2+ ), 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 Mn 3 O 4 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.

BiOIO3@Zn3(PO4)2·4H2O Heterojunction with Fast Ionic Diffusion Kinetics for Long-Life “Rocking-Chair” Zinc Ion Batteries

“…In the fully discharged state, the intensity of the hydroxyl group is significantly enhanced, indicating the synchronous insertion of Zn 2+ and H 2 O (Figure 6d). 51 However, the incomplete extraction of H 2 O is obvious when the electrode is recharged to 1.3 V. The elemental mapping of BiOIO 3 at 0.2 V also proves the intercalation of many Zn 2+ (Figure 6e). Based on the above analyses, the detected new phase in the XRD pattern is composed of Bi, O, I, Zn, and H elements.…”

“…In a previous work, it is found that Bi-based layered materials with large interlayer distances are potential anodes in "rocking-chair" ZIBs. 51 The Aurivillius-type BiOIO 3 composed of (Bi 2 O 2 ) 2+ layers and IO 3 − pyramids exhibits an impressive interlamellar spacing of ≈1.13 nm, 52 larger than those of common layered materials, such as δ-MnO 2 (0.69 nm), 53 NH 4 V 4 O 10 (0.96 nm), 54 and MoS 2 (0.61 nm). 55 Thus, BiOIO 3 may be also an excellent anode.…”

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

“…Zinc-ion batteries (ZIBs) have drawn the attention from researchers due to their high theoretical capacity (825 mAh g −1 and 5854 mAh cm −3 ), inherent safety, and economic feasibility. [1][2][3][4][5][6][7][8] Up to now, a great advance has been made in the study of aqueous ZIBs. Abundant Mn-based and Vbased materials have been developed as cathodes of ZIBs and they show excellent electrochemical properties and a wide application perspective.…”

“…BiOI with a low diffusion barrier (0.57 eV) shows good rate performances but slow capacity decay during cyclic test and the battery performances of high mass electrodes are not studied. [ 8 ] BiOBr with good chemical durability also has great potential for application in ZIBs, but its large diffusion barrier (1.06 eV) needs to be improved. [ 8 ] In this work, Co‐doped BiOBr ultrathin nanosheet (Co‐UTBiOBr) is synthesized by one‐step hydrothermal method and used as insertion host material.…”

“…[ 8 ] BiOBr with good chemical durability also has great potential for application in ZIBs, but its large diffusion barrier (1.06 eV) needs to be improved. [ 8 ] In this work, Co‐doped BiOBr ultrathin nanosheet (Co‐UTBiOBr) is synthesized by one‐step hydrothermal method and used as insertion host material. The free‐standing nanopaper electrode consists of Co‐UTBiOBr and CNTs.…”