Sodium-Ion-Assisted Hydrothermal Synthesis of γ-MnO2 and Its Electrochemical Performance

被引：14

作者：

Lv, Dongping ^{[1
]}

Huang, Xingkang ^{[1
,2
]}

Yue, Hongjun ^{[1
]}

Yang, Yong ^{[1
]}

机构：

[1] Xiamen Univ, Coll Chem & Chem Engn, Dept Chem, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China

[2] Fujian Nanping Nanfu Battery Co Ltd, Nanping 353000, Peoples R China

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2009年 / 156卷 / 11期

基金：

中国国家自然科学基金;

关键词：

ELECTROLYTIC MANGANESE-DIOXIDE; RECHARGEABLE LITHIUM BATTERIES; OCTAHEDRAL MOLECULAR-SIEVES; DISCHARGE PERFORMANCE; TUNNEL STRUCTURES; CATION TEMPLATES; ACETYLENE BLACK; ALKALI-METAL; OXIDE; MNO2;

D O I：

10.1149/1.3206586

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A gamma-MnO2 nanomaterial was synthesized by hydrothermally treating an amorphous manganese oxide, which was obtained by the reaction between NaMnO4 and MnSO4 at ambient conditions. It is only in a narrow range of adding an amount of NaOH (e.g., 0.08-0.09 M in our case) that gamma-MnO2 can be obtained. The addition of NaOH may affect the radii of hydrated Na+ and, consequently, the formation of gamma-MnO2; the related mechanism was discussed. gamma-MnO2 was characterized by X-ray diffraction (XRD), scanning electron microscope, transmission electron microscope, and temperature-programmed XRD. gamma-MnO2 was also characterized by the combined thermogravimetric/differential thermal analysis-mass spectrometry; accordingly, the annealed forms of gamma-MnO2 were prepared and characterized electrochemically. The results show that the gamma-MnO2 calcined at 275 degrees C for 10 h showed excellent capacity (296 mAh g(-1)) with a good rate capability. (C) 2009 The Electrochemical Society. [DOI: 10.1149/1.3206586] All rights reserved.

引用

页码：A911 / A916

页数：6

共 48 条

[21] Effects of alkali metal and ammonium cation templates on nanofibrous cryptomelane-type manganese oxide octahedral molecular sieves (OMS-2) [J].