Storage performance of LiFePO4 nanoplates

被引：263

作者：

Saravanan, Kuppan ^{[3
]}

Reddy, M. V. ^{[2
]}

Balaya, Palani ^{[1
]}

Gong, Hao ^{[4
]}

Chowdari, B. V. R. ^{[2
]}

Vittal, Jagadese J. ^{[3
]}

机构：

[1] NUS, Dept Mech Engn, Singapore 119260, Singapore

[2] NUS, Dept Phys, Singapore 117542, Singapore

[3] Natl Univ Singapore, Dept Chem, Singapore 117543, Singapore

[4] NUS, Dept Mat Sci & Engn, Singapore 119260, Singapore

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2009年 / 19卷 / 05期

关键词：

PHOSPHO-OLIVINES; ROOM-TEMPERATURE; LITHIUM; MORPHOLOGY; IRON; CONDUCTIVITY; NANOWIRES; COMPOSITE; TRANSPORT; CAPACITY;

D O I：

10.1039/b817242k

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：

The morphology of electrode materials is addressed as a key factor controlling rapid lithium storage in anisotropic systems such as LiFePO4. In view of this, we have synthesized nanoplates of LiFePO4 with a uniform coating of a 5 nm thick amorphous carbon layer by the solvothermal method and investigated their electrochemical storage behavior. The obtained nanoplates are well characterized by XRPD, SEM, HRTEM and XPS techniques. The thickness along the b-axis is found to be 30-40 nm; such a morphology favors short diffusion lengths for Li+ ions, while the external conductive carbon coating provides connectivity for facile electron diffusion, resulting in high rate performances. Increase in the size of the nanoplates results in poor lithium storage performance. The storage performance of nanoplates is compared with that of mesoporous nanoparticles of LiFePO4 with non-uniform carbon coating. This paper thus describes the advantages of thinner nanoplates for high rate storage performances of battery electrode materials.

引用

页码：605 / 610

页数：6