Nanocomposites LiMnxFe1-xPO4/C synthesized via freeze drying assisted sol-gel routine and their magnetic and electrochemical properties

Authors

Liying Liu, Guangdong University of Technology
Zujie Cao, Guangdong University of Technology
Yanyan Cui, Guangdong University of Technology
Xi Ke, Guangdong University of Technology
Guoxun Zeng, Guangdong University of Technology
Jun Liu, Guangdong University of Technology
Dan Liu, Dynavolt Renewable Energy Technology Co., Ltd.
Qinghai Li, Dynavolt Renewable Energy Technology Co., Ltd.
Jian Lai, Dynavolt Renewable Energy Technology Co., Ltd.
Zhicong Shi, Guangdong University of Technology
Shulei Chou, University of WollongongFollow

RIS ID

131943

Publication Details

Liu, L., Cao, Z., Cui, Y., Ke, X., Zeng, G., Liu, J., Liu, D., Li, Q., Lai, J., Shi, Z. & Chou, S. (2019). Nanocomposites LiMnxFe1-xPO4/C synthesized via freeze drying assisted sol-gel routine and their magnetic and electrochemical properties. Journal of Alloys and Compounds, 779 339-346.

Abstract

Nanocomposites LiMnxFe1-xPO4/C (x = 1, 5/6, 2/3, 1/2) are synthesized by a sol-gel route combined with freeze drying. Fe2+ substituted samples coated by high-ordered carbon have the same olivine structure of LiMnPO4/C but reduced cell volumes. Fe2+ substituting greatly influences magnetic characteristics of LiMnPO4/C and slight amounts of Fe2P impurity in Fe2+ doped samples are verified by magnetic tests. Fe2+ substituted samples exhibit much better electrochemical properties. Among them, LiMn1/2Fe1/2PO4/C displays the best rate capacity and cyclic stability. Its initial discharge capacity reaches 140.1 mAh g−1 and remains at 132.5 mAh g−1 after 100 cycles at 2C, remarkably higher than those of LiMnPO4/C. The superior electrochemical performances are mainly attributed to small charge-transfer impedance, fast Li+ diffusion, residual carbon and existence of Fe2P with excellent electronic conductivity.