Super Charge Separation and High Voltage Phase in NaxMnO2

被引：38

作者：

Chen, Xi ^{[1
]}

Wang, Yichao ^{[1
]}

Wiaderek, Kamila ^{[2
]}

Sang, Xiahan ^{[3
]}

Borkiewicz, Olaf ^{[2
]}

Chapman, Karena ^{[2
]}

LeBeau, James ^{[3
]}

Lynn, Jeffrey ^{[4
]}

Li, Xin ^{[1
]}

机构：

[1] Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA

[2] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

[3] North Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA

[4] NIST, Ctr Neutron Res, Gaithersburg, MD 20899 USA

来源：

ADVANCED FUNCTIONAL MATERIALS | 2018年 / 28卷 / 50期

基金：

美国国家科学基金会;

关键词：

magnetic properties of sodium manganese oxides; Na ion batteries; novel high-voltage phases; reversible asymmetric structural evolutions; super charge-separations; ELECTROCHEMICAL INTERCALATION; SODIUM; PERFORMANCE; DEINTERCALATION; CATHODE; OXIDES; COO2;

D O I：

10.1002/adfm.201805105

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

NaxMnO2 shows Mn3+ and Mn4+ charge separation with the charge stripe ordering upon Na deintercalation at x=5/8. In this paper it is shown that, surprisingly, at lower Na compositions of 5/8 > x >= 1/18 the phase evolution pathway of NaxMnO2 upon Na deintercalation shows a unique phenomenon of super charge separation, where the Mn3+ and Mn4+ ions fully charge-separate into charge superplanes formed by succession of charge stripes in the third dimension. The Mn3+ superplanes attract Na ions electronically, and dominate the antiferromagnetic interactions in NaMnO2. Na ions in Mn3+ superplanes also naturally pillar the MnO2 layers to form the unusual O1 phases with large interlayer distances at x < 1/3, which dominates the unique electrochemical behavior of NaMnO2.

引用

页数：12

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