Particle Size Dependence of the Ionic Diffusivity

被引：695

作者：

Malik, Rahul ^{[1
]}

Burch, Damian ^{[2
]}

Bazant, Martin ^{[2
,3
]}

Ceder, Gerbrand ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[2] MIT, Dept Math, Cambridge, MA 02139 USA

[3] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

来源：

NANO LETTERS | 2010年 / 10卷 / 10期

基金：

美国国家科学基金会;

关键词：

Batteries; diffusion; nano; ab initio; BATTERY MATERIALS; ROOM-TEMPERATURE; LIFEPO4; TRANSPORT; DEFECTS; MN; FE; CO; CONDUCTIVITY; OLIVINES;

D O I：

10.1021/nl1023595

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Diffusion constants are typically considered to be independent of particle size with the benefit of nanosizing materials arising solely from shortened transport paths We show that for materials with one-dimensional atomic migration channels, the diffusion constant depends on particle size with diffusion in bulk being much slower than in nanoparticles This model accounts for conflicting data on LiFePO4. an important material for rechargeable lithium batteries, specifically explaining why it functions exclusively on the nanoscale

引用

收藏

页码：4123 / 4127

页数：5

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