Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Performance of High-Voltage LiMn0.8Fe0.2PO4 Cathode with Polyacrylonitrile (PAN)-Based Gel Polymer Electrolyte

  • Kwon, O. Hyeon (Department of Solar & Energy Engineering, Cheongju University) ;
  • Kim, Jae-Kwang (Department of Solar & Energy Engineering, Cheongju University)
  • Received : 2019.07.04
  • Accepted : 2019.07.11
  • Published : 2019.08.01
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Abstract

Electrochemical properties of $LiMn_{0.8}Fe_{0.2}PO_4$ cathode were investigated with gel polymer electrolyte (GPE). To access fast and efficient transport of ions and electrons during the charge/discharge process, a pure and well-crystallized $LiMn_{0.8}Fe_{0.2}PO_4$ cathode material was directly synthesized via spray-pyrolysis method. For high operation voltage, polyacrylonitrile (PAN)-based gel polymer electrolyte was then prepared by electrospinning process. The gel polymer electrolyte showed high ionic conductivity of $2.9{\times}10^{-3}S\;cm^{-1}$ at $25^{\circ}C$ and good electrochemical stability. $Li/GEP/LiMn_{0.8}Fe_{0.2}PO_4$ cell delivered a discharge capacity of $159mAh\;g^{-1}$ at 0.1 C rate that was close to the theoretical value ($170mAh\;g^{-1}$). The cell allows stable cycle performance (99.3% capacity retention) with discharge capacity of $133.5mAh\;g^{-1}$ for over 300 cycles at 1 C rate and exhibits high rate-capability. PAN-based gel polymer is a suitable electrolyte for application in $LiMn_{0.8}Fe_{0.2}PO_4/Li$ batteries with perspective in high energy density and safety.

Keywords

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Fig. 1. XRD patterns of standard LiFePO4, LiMnPO4 and prepared LiMn0.8Fe0.2PO4.

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Fig. 2. SEM images (a) and EDX images (b) of LMFP microspherical powders.

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Fig. 3. SEM images of electrospun PAN membrane (a) and gel polymer electrolyte (b), electrochemical impedance spectroscopy (c) and LSV (d) of gel polymer electrolyte.

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Fig. 4. Uptake analysis of electrospun PAN membrane.

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Fig. 5. Cyclic voltammetry of LiFePO4 and LMFP cells.

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Fig. 6. Charge-discharge profiles (a), rate-capability (b) and cycle performance Li/GPE/LMFP cells.

Table 1. Unit cell parameters of LiFePO4, LiMnPO4 and prepared LiMn0.8Fe0.2PO4

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