Rechargeable aqueous zinc-manganese dioxide batteries with high energy and power densities

DOI number:10.1038/s41467-017-00467-x

Journal:Nature Communications

Key Words:ION INTERCALATION；HIGH-CAPACITY；CATHODE；TRANSFORMATION；ALPHA-MNO2；TODOROKITE；ELECTRODES；MECHANISM；BUSERITE；STORAGE

Abstract:Although alkaline zinc-manganese dioxide batteries have dominated the primary battery applications, it is challenging to make them rechargeable. Here we report a high-performance rechargeable zinc-manganese dioxide system with an aqueous mild-acidic zinc triflate electrolyte. We demonstrate that the tunnel structured manganese dioxide polymorphs undergo a phase transition to layered zinc-buserite on first discharging, thus allowing subsequent intercalation of zinc cations in the latter structure. Based on this electrode mechanism, we formulate an aqueous zinc/manganese triflate electrolyte that enables the formation of a protective porous manganese oxide layer. The cathode exhibits a high reversible capacity of 225 mAh g−1 and long-term cyclability with 94% capacity retention over 2000 cycles. Remarkably, the pouch zinc-manganese dioxide battery delivers a total energy density of 75.2 Wh kg−1. As a result of the superior battery performance, the high safety of aqueous electrolyte, the facile cell assembly and the cost benefit of the source materials, this zinc-manganese dioxide system is believed to be promising for large-scale energy storage applications.

Co-author:Junxiang Liu, Liubin Wang, Xinghui Long, Xiaosong Liu, Fujun Li

First Author:Ning Zhang

Correspondence Author:Fangyi Cheng ,Jun Chen

Document Code:405

Volume:8

ISSN No.:2041-1723

Translation or Not:no

Date of Publication:2017-09-01

Links to published journals:https://www.nature.com/articles/s41467-017-00467-x