A layered δ-MnO2 nanoflake cathode with high zinc-storage capacities for eco-friendly battery applications

被引：485

作者：

Alfaruqi, Muhammad Hilmy ^{[1
]}

Gim, Jihyeon ^{[1
]}

Kim, Sungjin ^{[1
]}

Song, Jinju ^{[1
]}

Duong Tung Pham ^{[1
]}

Jo, Jeonggeun ^{[1
]}

Xiu, Zhiliang ^{[1
]}

Mathew, Vinod ^{[1
]}

Kim, Jaekook ^{[1
]}

机构：

[1] Chonnam Natl Univ, Dept Mat Sci & Engn, Gwangju 500757, South Korea

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2015年 / 60卷

基金：

新加坡国家研究基金会;

关键词：

Layered structure; Manganese dioxide; Aqueous zinc-ion batteries; Energy storage; MANGANESE OXIDE; LITHIUM; MNO2; PERFORMANCE; IMPROVEMENT; ELECTRODE; LICOO2;

D O I：

10.1016/j.elecom.2015.08.019

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

This study reports the use of a layered-type birnessite delta-MnO2 nano-flake cathode for eco-friendly zinc-ion battery (ZIB) applications. The present delta-MnO2 was prepared via the simple low temperature thermal decomposition of KMnO4 The X-ray diffraction (XRD) pattern of the samples was well indexed to the delta-MnO2 phase. Field emission SEM and TEM images of the delta-MnO2 revealed flake-like morphologies with an average diameter of 200 nm. The electrochemical properties, investigated by cyclic voltammetry and constant current charge-discharge measurements, revealed that the nano-flake cathode exhibited first discharge capacity of 122 mAh g(-1) under a high current density of 83 mA g-1 versus zinc. The discharge capacity thereafter increased until it reached 252 mAh g-1 in the fourth cycle. On the hundredth cycle, the electrode registered a discharge capacity of 112 mAh g(-1). Coulombic efficiencies of nearly 100% were maintained on prolonged cycling and thereby indicate the long cycle stability of the delta-MnO2. Besides, the realization of specific capacities of 92 and 30 mAh/g at high current densities of 666 and 1333 mA respectively, clearly demonstrates the decent rate capabilities of delta-MnO2 nano-flake cathode. These results may facilitate the utilization of layered-type birnessite delta-MnO2 in ZIB applications. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：121 / 125

页数：5

共 26 条

[1] Electrochemically Induced Structural Transformation in a γ-MnO2 Cathode of a High Capacity Zinc-Ion Battery System [J].