The P2-Na2/3Co2/3Mn1/3O2 phase: structure, physical properties and electrochemical behavior as positive electrode in sodium battery

被引：215

作者：

Carlier, D. ^{[1
,2
]}

Cheng, J. H. ^{[1
,3
]}

Berthelot, R. ^{[1
,4
]}

Guignard, M. ^{[1
,2
]}

Yoncheva, M. ^{[1
,5
]}

Stoyanova, R. ^{[1
,5
]}

Hwang, B. J. ^{[3
]}

Delmas, C. ^{[1
,2
]}

机构：

[1] Univ Bordeaux, CNRS, ICMCB, F-33608 F Pessac, France

[2] CNRS, ENSCBP, ICMCB, F-33608 F Pessac, France

[3] Natl Taiwan Univ Sci & Technol, Dept Chem Engn, Taipei 106, Taiwan

[4] CEA Grenoble, DRT LITEN, F-38054 Grenoble, France

[5] Bulgarian Acad Sci, Inst Gen & Inorgan Chem, BU-1113 Sofia, Bulgaria

来源：

DALTON TRANSACTIONS | 2011年 / 40卷 / 36期

关键词：

NI; BRONZES; MN; CO; NAXCOO2; OXIDES; SYSTEM;

D O I：

10.1039/c1dt10798d

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Manganese substituted sodium cobaltate, Na2/3Co2/3Mn1/3O2, with a layered hexagonal structure (P2-type) was obtained by a co-precipitation method followed by a heat treatment at 950 degrees C. Powder X-ray diffraction analysis revealed that the phase is pure in the absence of long-range ordering of Co and Mn ions in the slab or Na+ and vacancy in the interslab space. The oxidation states of the transition metal ions were studied by magnetic susceptibility measurements, electron paramagnetic resonance (ESR) and Na-23 magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy. The charge compensation is achieved by the stabilization of low-spin Co3+ and Mn4+ ions. The capability of Na2/3Co2/3Mn1/3O2 to intercalate and deintercalate Na+ reversibly was tested in electrochemical sodium cells. It appears that the P2 structure is maintained during cycling, the cell parameter evolution versus the sodium amount is given. From the features of the cycling curve the formation of an ordered phase for the Na0.5Co2/3Mn1/3O2 composition is expected.

引用

页码：9306 / 9312

页数：7

共 23 条

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