Improving Energy Density and Structural Stability of Manganese Oxide Cathodes for Na-Ion Batteries by Structural Lithium Substitution

被引：241

作者：

de la Llave, Ezequiel ^{[1
]}

Talaie, Elahe ^{[2
,3
]}

Levi, Elena ^{[1
]}

Nayak, Prasant Kumar ^{[1
]}

Dixit, Mudit ^{[1
]}

Rao, Penki Tirupathi ^{[1
]}

Hartmann, Pascal ^{[4
]}

Chesneau, Hartmann Frederick ^{[4
]}

Major, Dan Thomas ^{[1
]}

Greenstein, Miri ^{[1
]}

Aurbach, Doron ^{[1
]}

Nazar, Linda F. ^{[2
,3
]}

机构：

[1] Bar Ilan Univ, Dept Chem, IL-5290002 Ramat Gan, Israel

[2] Univ Waterloo, Dept Chem, Waterloo, ON N2L 3G1, Canada

[3] Univ Waterloo, Waterloo Inst Nanotechnol, Waterloo, ON N2L 3G1, Canada

[4] BASF SE, D-67056 Ludwigshafen, Germany

来源：

CHEMISTRY OF MATERIALS | 2016年 / 28卷 / 24期

基金：

以色列科学基金会;

关键词：

INITIO MOLECULAR-DYNAMICS; ANIONIC REDOX CHEMISTRY; SODIUM-ION; ELECTROCHEMICAL-BEHAVIOR; ELECTRODE MATERIALS; OXYGEN LOSS; LI; INTERCALATION; PHASE; CELLS;

D O I：

10.1021/acs.chemmater.6b04078

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 report excellent cycling performance for P2 - Na0.6Li0.2Mn0.8O2 an auspicious cathode material for sodium-ion batteries. This material, which contains mainly Mn4+ exhibits a long voltage plateau on the first charge, similar to that of high-capacity lithium and manganese-rich metal oxides. Electrochemical measurements, X-ray diffraction, and elemental analysis of the cycled electrodes suggest an activation process that includes the extraction of lithium from the material. The "activated" material delivers a stable, high specific capacity up to similar to 190 mAh/g after 100 cycles in the voltage window between 4.6-2.0 V versus Na/Na+. DFT calculations locate the energy states of oxygen atoms near the Fermi level, suggesting the possible contribution of oxide ions to the redox process. The addition of Li to the lattice improves structural stability compared to many previously reported sodiated transition-metal oxide electrode materials, by inhibiting the detrimental structural transformation ubiquitously observed with sodium manganese oxides during cycling. This research demonstrates the prospect of intercalation materials for Na-ion battery technology that are active based on both cationic and anionic redox moieties.

引用

页码：9064 / 9076

页数：13

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