Aluminium-doped LiFePO4 single crystals

被引：48

作者：

Amin, Ruhul ^{[1
]}

Lin, Chengtian ^{[1
]}

Maier, Joachim ^{[1
]}

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2008年 / 10卷 / 24期

关键词：

D O I：

10.1039/b801234b

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：

Single crystals of Al-doped LiFePO(4) (1% Al) were grown by an optical floating zone technique. After cleaving from the as-grown ingot they exhibited a blackish-green color. The grown crystals have been characterized by the Laue X-ray technique, single-crystal and powder X-ray diffraction. Phase composition has been determined by chemical analysis to be Li(0.985 +/- 0.009)Fe(0.984 +/- 0.12)Al(0.0126)PO(3.993 +/- 0.06). Secondary ion beam spectroscopy (SIMS) indicates a homogeneous distribution of doped Al in the single crystal block. The total conductivities are shown to be electronic conductivities and have been measured along different directions with the help of the cell Ti/LiFe(Al)PO(4)/Ti. The samples exhibit effectively two-dimensional electronic conductivities along b- and c-directions similar as in pure LiFePO(4). This decrease of conductivity on Al-doping compared with undoped crystals is in agreement with our previous conclusion of p-type conductivity of LiFePO(4). Unlike nominally pure material not only the association of holes with lithium vacancies plays an important role but also purely ionic association.

引用

页码：3519 / 3523

页数：5

共 28 条

[1] Effect of annealing on transport properties of LiFePO4:: Towards a defect chemical model
Amin, R.
Maier, J.
[J]. SOLID STATE IONICS, 2008, 178 (35-36) : 1831 - 1836
[2] AMIN R, 2008, SOLID STATE IONICS
[3] AMIN R, PHYS CHEM CHEM PHYS
[4] AMIN R, 2008, ADV FUNCT MAT UNPUB
[5] Anisotropy of electronic and ionic transport in LiFePO4 single crystals
Amin, Ruhul
Balaya, Palani
Maier, Joachim
[J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2007, 10 (01) : A13 - A16
[6] [Anonymous], [No title captured]
[7] Novel olivine and spinel LiMAsO4 (M=3d-metal) as positive electrode materials in lithium cells
Arroyo-de Dompablo, M. E.
Amador, U.
Alvarez, M.
Gallardo, J. M.
Garcia-Alvarado, F.
[J]. SOLID STATE IONICS, 2006, 177 (26-32) : 2625 - 2628
[8] Floating zone growth of lithium iron (II) phosphate single crystals
Chen, DP
Maljuk, A
Lin, CT
[J]. JOURNAL OF CRYSTAL GROWTH, 2005, 284 (1-2) : 86 - 90
[9] Electronically conductive phospho-olivines as lithium storage electrodes
Chung, SY
Bloking, JT
Chiang, YM
[J]. NATURE MATERIALS, 2002, 1 (02) : 123 - 128
[10] Size effects on carbon-free LiFePO4 powders
Delacourt, C.
Poizot, P.
Levasseur, S.
Masquelier, C.
[J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2006, 9 (07) : A352 - A355

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