Electrochemically-induced reversible transition from the tunneled to layered polymorphs of manganese dioxide

Title
Electrochemically-induced reversible transition from the tunneled to layered polymorphs of manganese dioxide
Authors
이보은윤종승이해리정경윤조병원오시형
Keywords
rechargeable zinc battery; manganese dioxide; phase transition; cathode
Issue Date
2014-08
Publisher
Scientific Reports
Citation
VOL 4, 6066-1-6066-8
Abstract
Zn-ion batteries are emerging energy storage systems eligible for large-scale applications, such as electric vehicles. These batteries consist of totally environmentally-benign electrode materials and potentially manufactured very economically. Although Zn/α-MnO2 systems produce high energy densities of 225 Wh kg−1, larger than those of conventional Mg-ion batteries, they show significant capacity fading during long-term cycling and suffer from poor performance at high current rates. To solve these problems, the concrete reaction mechanism between α-MnO2 and zinc ions that occur on the cathode must be elucidated. Here, we report the intercalation mechanism of zinc ions into α-MnO2 during discharge, which involves a reversible phase transition of MnO2 from tunneled to layered polymorphs by electrochemical reactions. This transition is initiated by the dissolution of manganese from α-MnO2 during discharge process to form layered Zn-birnessite. The original tunneled structure is recovered by the incorporation of manganese ions back into the layers of Zn-birnessite during charge process.
URI
http://pubs.kist.re.kr/handle/201004/48027
ISSN
20452322
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE