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A comparison of electrochemical performance between LiFe0.4Mn0.595Cr0.005PO4/C and LiMnPO4/C cathode materials was conducted in this paper. The cathode samples were synthesized by a nano-milling-assisted solid-state process using caramel as carbon sources. The prepared samples were investigated by XRD, SEM, TEM, energy-dispersive X-ray spectroscopy (EDAX), powder conductivity test (PCT), carbon-sulfur analysis, electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge cycling. The results showed that LiFe0.4Mn0.595Cr0.005PO4/C exhibited high specific capacity and high energy density. The initial discharge capacity of LiFe0.4Mn0.595Cr0.005PO4/C was 163.6 mAh g−1 at 0.1C (1C = 160 mA g−1), compared to 112.3 mAh g−1 for LiMnPO4/C. Moreover, the Fe/Cr-substituted sample showed good cycle stability and rate performance. The capacity retention of LiFe0.4Mn0.595Cr0.005PO4/C was 98.84 % over 100 charge-discharge cycles, while it was only 86.64 % for the pristine LiMnPO4/C. These results indicated that Fe/Cr substitution enhanced the electronic conductivity for the prepared sample and facilitated the Li+ diffusion in the structure. Furthermore, LiFe0.4Mn0.595Cr0.005PO4/C composite presented high energy density (606 Wh kg−1) and high power density (574 W kg−1), thus suggested great potential application in lithium ion batteries (LIBs).
Ionics – Springer Journals
Published: Jan 21, 2016
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