Confirmation of the Domino-Cascade Model by LiFePO4/FePO4 Precession Electron Diffraction

被引：150

作者：

Brunetti, G. ^{[2
]}

Robert, D. ^{[1
]}

Bayle-Guillemaud, P.

Rouviere, J. L.

Rauch, E. F. ^{[3
]}

Martin, J. F. ^{[1
]}

Colin, J. F. ^{[1
]}

Bertin, F. ^{[2
]}

Cayron, C. ^{[1
]}

机构：

[1] CEA, LITEN, F-38054 Grenoble, France

[2] CEA, LETI, F-38054 Grenoble, France

[3] Univ Grenoble, CNRS, Sci & Ingn Mat & Proc, Grenoble INP UJF, F-38402 St Martin Dheres, France

来源：

CHEMISTRY OF MATERIALS | 2011年 / 23卷 / 20期

关键词：

lithium batteries; LiFePO4; TEM; phase mapping; precession electron diffraction; BATTERY MATERIALS; MISCIBILITY GAP; SOLID-SOLUTION; ORIENTATION; SIZE; LIXFEPO4; SYSTEM; FE; EXISTENCE; CATHODES;

D O I：

10.1021/cm201783z

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：

A recent transmission electron microscopy (TEM) method using precession electron diffraction (PED) was used to obtain LiFePO4 and FePO4 phase mapping at the nanometer-scale level on a large number of particles of sizes between 50 and 300 nm in a partially charged cathode. Despite the similarity of the two phases (the difference of lattice parameters is <5%), the method gives clear results that have been confirmed using high-resolution transmission electron microscopy (HRTEM) and energy-filtered transmission electron microscopy/electron energy loss spectroscopy (EFTEM/EELS) experiments. The PED maps show that the particles are either fully lithiated or fully delithiated and, therefore, bring a strong support to the domino-cascade model at the nanoscale level (scale of a particle). A core-shell model or spinodal decomposition at mesoscale (scale of agglomerates of particles) is possible. Size effects on the transformation are also discussed.

引用

页码：4515 / 4524

页数：10

共 42 条

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