Low-cost LiFePO4 using Fe metal precursor

被引：21

作者：

Kim, Donghan ^{[1
]}

Lim, Jinsub ^{[1
]}

Mathew, Vinod ^{[1
]}

Koo, Bonil ^{[2
]}

Paik, Younkee ^{[3
]}

Ahn, Docheon ^{[4
]}

Paek, Seung-Min ^{[5
]}

Kim, Jaekook ^{[1
]}

机构：

[1] Chonnam Natl Univ, Dept Mat Sci & Engn, Kwangju 500757, South Korea

[2] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA

[3] Korea Basic Sci Inst, Daegu Ctr, Taegu 702701, South Korea

[4] Pohang Accelerator Lab, Pohang 790784, South Korea

[5] Kyungpook Natl Univ, Dept Chem, Taegu 702701, South Korea

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2012年 / 22卷 / 06期

关键词：

ELECTROCHEMICAL PROPERTIES; ELECTRODE MATERIALS; OLIVINE MATERIALS; NANOCRYSTALS; NANOPARTICLES; BATTERIES; RECONSTRUCTION; TEMPERATURE; CATHODES; LI-7;

D O I：

10.1039/c2jm14499a

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 nano-LiFePO4 possessing a plate-shaped morphology was synthesized by the solvothermal process using low-cost Fe metal powder as the starting precursor at a moderate temperature of around 230 degrees C under high pressure. Field-emission scanning electron microscopy (FE-SEM) images revealed the average thickness, length and width of the nanoplates to be 20, 100 and 100 nm respectively. The nanoplate-LiFePO4 delivered specific discharge capacities of 171 mA h g(-1) with impressive cycle performance until 150 cycles and high rate capabilities as capacities of 125 mA h g(-1) was achieved at elevated C-rates of 16 C. Field-emission transmission electron microscopy (FE-TEM) confirmed the growth of the nanoplates along the [010] and [101] crystallographic directions. Solid state 7 Li magic angle spinning nuclear magnetic resonance study suggests progressive Li-ion intercalation/deintercalation along a specific crystallographic direction and appears to support the domino-cascade model. Extended X-ray absorption fine structure spectroscopy (EXAFS) studies indicated a flexible LiFePO4 nanostructure due to the reconstruction of crystals' surface and thereby realize enhanced capacities. We believe that the strategy to adopt Fe-metal precursor in order to obtain such high performing nano-LiFePO4 is very promising for large-scale commercialization from a cost perspective.

引用

页码：2624 / 2631

页数：8

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