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A Surfactant-Assisted Synthesis Route for Scalable Preparation of High Performance of LiFe0.15Mn0.85PO4/C Cathode Using Bimetallic Precursor

Authors Zhou, Xue
Deng, Yuanfu
Wan, Lina
Qin, Xusong HKUST affiliated (currently or previously)
Chen, Guohua View this author's profile
Issue Date 2014
Source Journal of Power Sources , v. 265, November 2014, p. 223-230
Summary A uniform carbon coated LiFe0.15Mn0.85PO4 (LFMP/C) cathode material is synthesized by a surfactant-assisted, highly reproducible and energy-saving solid state method using a bimetallic oxalate (Fe0.15Mn0.85C2O4) precursor. The obtained LiFe0.15Mn0.85PO4/C composite is characterized by X-ray diffraction (XRD), Raman spectrum, elemental analysis (EA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The experimental results demonstrate that the oleic acid as a surfactant, for the scale preparation of LFMP, plays a critical role in controlling size of the obtained composite. The LiFe0.15Mn0.85PO4/C exhibits high specific capacity and good rate performance. It delivers initial discharge capacities of 156.5, 142.5, 129.0 and 103.0 mAh g(-1) at 0.05, 0.1, 0.5 and 1C, respectively. Moreover, it shows good cycle stability at both room temperature (25 C, 89% and 88% capacity retention after 250 and 500 cycles at 0.5 and 1C rates, respectively) and elevated temperature (55 degrees C, 80% capacity retention after 200 cycles at 0.5 degrees C rate). The significantly improved rate and cycling capability of the LiFe0.15Mn0.85PO4/C is attributed to the uniform carbon coating layer on the primary particles, the conductive network provided by the carbon between the LiMn0.15Fe0.85PO4/C particles and the sufficient pores formed in the LiFe0.15Mn0.85PO4/C aggregates. (c) 2014 Elsevier B.V. All rights reserved.
ISSN 0378-7753
Language English
Format Article
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