Simultaneously Regulating Uniform -Zn2+ Flux and Electron Conduction by MOF/rGO Interlayers for High?Performance Zn Anodes

• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2021,（5）
• 页码范围: 34-44
• 页数: 11页
• 语种: 英文

摘要

Owing to the merits of low cost, high safety and environ-mental benignity, rechargeable aqueous Zn-based batteries (ZBs) have gained tremendous attention in recent years. Nevertheless, the poor reversibility of Zn anodes that originates from dendrite growth, surface passivation and corrosion, severely hinders the further development of ZBs. To tackle these issues, here we report a Janus separator based on a Zn-ion conductive metal–organic framework (MOF) and reduced gra-phene oxide (rGO), which is able to regulate uniform -Zn2+ flux and electron conduction simultaneously during battery operation. Facilitated by the MOF/rGO bifunctional interlayers, the Zn anodes demonstrate stable plating/stripping behavior (over 500 h at 1 mA cm?2), high Cou-lombic efficiency (99.2％ at 2 mA cm?2 after 100 cycles) and reduced redox barrier. Moreover, it is also found that the Zn corrosion can be effectively retarded through diminishing the potential discrepancy on Zn surface. Such a separator engineering also saliently promotes the overall performance of Zn|MnO2 full cells, which deliver nearly 100％ capacity retention after 2000 cycles at 4 A -g?1 and high power density over 10 kW kg?1. This work provides a feasible route to the high-performance Zn anodes for ZBs.