Hierarchical structured LiMn0.5Fe0.5PO4 spheres synthesized by template-engaged reaction as cathodes for high power Li-ion batteries

Authors

Wei Xiang, Sichuan University
En-Hui Wang, Sichuan University
Mingzhe Chen, University of WollongongFollow
Huihui Shen, Sichuan UniversityFollow
Shulei Chou, University of WollongongFollow
Hong Chen, Zhejiang University
Xiao Dong Guo, University of Wollongong
Ben He Zhong, Sichuan University
Xinlong Wang, Sichuan University

RIS ID

102587

Publication Details

Xiang, W., Wang, E., Chen, M., Shen, H., Chou, S., Chen, H., Guo, X., Zhong, B. & Wang, X. (2015). Hierarchical structured LiMn_0.5Fe_0.5PO₄ spheres synthesized by template-engaged reaction as cathodes for high power Li-ion batteries. Electrochimica Acta, 178 353-360.

Abstract

Porous hierarchical LiMn_0.5Fe_0.5PO₄ spheres were synthesized via a novel template-engaged method using pre-synthesized hollow spherical Li₃PO₄ as template and FeCl₂·4H₂O/MnCl₂·4H₂O as Fe²⁺/Mn²⁺ source. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the porous hierarchical spheres exhibit hollow structure and have a size distribution of 0.4-1 um consisting of aggregated approx. 50 nm nanoparticles. A mechanism of the reaction from Li₃PO₄ to LiMn_0.5Fe_0.5PO₄ was proposed on the basis of the phase and morphology transformation of the intermediates. With the short Li⁺ diffusion path and porous structure, the carbon coated LiMn_0.5Fe_0.5PO₄ spheres show high specific capacity and superior rate capability with the discharge capacities of 159.3 mA h g^-1 at 0.1C and 80.6 mA h g^-1 at 20C. The porous hierarchical spheres also exhibit an excellent cycling stability with about 90.7% of the initial value at 1C after 100 cycles.