Few-Atomic-Layered Co-Doped BiOBr Nanosheet：用于“摇椅”锌离子电池的具有超高质量负载的独立阳极,Advanced Science

当前位置： X-MOL 学术 › Adv. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Few-Atomic-Layered Co-Doped BiOBr Nanosheet：用于“摇椅”锌离子电池的具有超高质量负载的独立阳极
Advanced Science ( IF 14.3 ) Pub Date : 2022-09-13 , DOI: 10.1002/advs.202204087
Bei Long ₁ , Qing Zhang ₁ , Tengfei Duan ₁ , Ting Song ₁ , Yong Pei ₁ , Xianyou Wang ₁ , Chunyi Zhi ₂ , Xiongwei Wu ₃ , Qianyu Zhang ₄ , Yuping Wu ₅

Affiliation

插入主体材料被认为是替代金属锌阳极的候选材料。然而，很少报道具有良好电化学性能的高质量负载阳极。在此，通过一步水热法制备了少原子层状 Co 掺杂 BiOBr 纳米片（Co-UTBiOBr），并设计了一种由 Co-UTBiOBr 和 CNT 组成的独立式柔性电极。超薄纳米片（3 个原子层）和 CNT 分别加速 Zn ²⁺和电子转移。Co掺杂有利于降低Zn ²⁺扩散势垒，改善Zn ^{2+后的体积膨胀}通过实验和理论研究验证了 BiOBr 的插层和增强的电子电导率。根据非原位表征提出了一种插入转换机制。受益于许多优势，Co-UTBiOBr在 0.1 A g ^{-1时显示出 150 mAh g}^{-1的高容量，并且在 1 A g}^-1时具有超过 3000 次循环的 ≈100% 容量关注的长期循环寿命。^{值得注意的是，即使在 15 mg cm -2}的超高质量负载下，也能保持出色的电化学性能。Co-UTBiOBr//MnO ₂ “摇椅”锌离子电池在0.2 A g ^{-1时表现出≈130 mAh g}^{-1的稳定容量}在循环测试中，其柔性准固态电池在各种弯曲状态下表现出出色的稳定性。该工作为设计高质量负载阳极提供了新思路。

"点击查看英文标题和摘要"

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

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

更新日期：2022-09-13

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南