Preparation and characterization of LiFe0.975Rh0.025PO4 nanorods using the hydrothermal method

DongGe Tong; YuanLiang Li; Wei Chu; Ping Wu; FuLan Luo

doi:10.1039/C0DT01643H

Preparation and characterization of LiFe_0.975Rh_0.025PO₄nanorods using the hydrothermal method

DongGe Tong,*^a YuanLiang Li,^a Wei Chu,^b Ping Wu^a and FuLan Luo^a

* Corresponding authors

^a Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, China
E-mail: tongdongge@163.com
Fax: +86-28-8407 9074
Tel: +86-28-8407 8939

^b College of Chemical Engineering, Sichuan University, Chengdu, China

Abstract

An effective method for the synthesis of LiFe_0.975Rh_0.025PO₄ nanorods to serve as a cathode material for lithium-ion batteries is described. During their preparation, L-lysine was used as the growth director of nanorods. The contribution from chloride ions to the formation of the unique nanorods was also investigated. The samples were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, Mössbauer measurements, scanning electron microscopy, electronic conductivity measurements, and transmission electron microscopy. The pH of the solution played a key role in controlling the particle size of the samples. The sample prepared at a pH of 9.5 exhibited excellent electrochemical performance. It delivered an initial discharge capacity of 143.1 mAh g⁻¹, and a capacity fade of only 7.7% was observed after 200 cycles at 2.5 C over a voltage range of 2.0–4.2 V. Furthermore, its discharge capacity remained stable for values as high as 20 C. The excellent electrochemical performance of LiFe_0.975Rh_0.025PO₄ nanorods can be attributed their unique nanorod structure, which limits the distance of lithium ion diffusion in the electrode material to the radius of the nanorods and decreases the surface-film resistance for the charge-transfer process.

Article information

https://doi.org/10.1039/C0DT01643H

Article type

Paper

Submitted

26 Nov 2010

Accepted

02 Feb 2011

First published

07 Mar 2011

Download Citation

Dalton Trans., 2011,40, 4087-4094

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Preparation and characterization of LiFe_0.975Rh_0.025PO₄ nanorods using the hydrothermal method

D. Tong, Y. Li, W. Chu, P. Wu and F. Luo, Dalton Trans., 2011, 40, 4087 DOI: 10.1039/C0DT01643H

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