Understanding on the structural and electrochemical performance of orthorhombic sodium manganese oxides

被引：48

作者：

Choi, Ji Ung ^{[1
]}

Yoon, Chong Seung ^{[2
]}

Zhang, Qian ^{[3
]}

Kaghazchi, Payam ^{[3
]}

Jung, Young Hwa ^{[4
]}

Lee, Kug-Seung ^{[4
]}

Ahn, Do-Cheon ^{[4
]}

Sun, Yang-Kook ^{[5
]}

Myung, Seung-Taek ^{[1
]}

机构：

[1] Sejong Univ, Dept Nano Technol & Adv Mat Engn, Seoul 05006, South Korea

[2] Hanyang Univ, Dept Mat Sci & Engn, Seoul 04763, South Korea

[3] Free Univ Berlin, Inst Chem & Biochem, Takustr 3, D-14195 Berlin, Germany

[4] Pohang Accelerator Lab, Beamline Dept, Pohang 37673, South Korea

[5] Hanyang Univ, Dept Energy Engn, Seoul 04763, South Korea

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2019年 / 7卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

AB-INITIO; INTERCALATION; CATHODE; P2-TYPE; PHASES;

D O I：

10.1039/c8ta08796b

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We investigate the orthorhombic Na-0.67[NixMn1-x]O-2 (x = 0 and 0.05) cathode materials that provide high capacity for prolonged cycles. X-ray absorption studies revealed that the redox activity of the Mn3+/4+ and Ni2+/3+ pairs is effective in suppressing the Jahn-Teller effect of Mn3+ ions because of the network with Ni2+ ions. This effect influenced the smooth voltage variations in the voltage profile for Na-0.67[Ni0.05Mn0.95]O-2, whereas several complicated voltage plateaus associated with the first-order phase transition were noticed in Na0.67MnO2. Operando synchrotron X-ray diffraction and transmission microscopy studies confirmed the simplicity of the phase transition for Na-0.67[Ni0.05Mn0.95]O-2 due to suppression of the Jahn-Teller effect of Mn3+ in the oxide lattice. These findings, along with the capacity retention during prolonged cycling and the acceptable thermal properties, make high-capacity sodium-ion batteries feasible, inexpensive, and safe for energy storage application.

引用

页码：202 / 211

页数：10

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