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The Electric Properties of Surface Coating with CePO4 and M3(PO4)2 (M=Mg, Zn) on Li4Ti5O12 for Energy Storage Capacitor

  • Received : 2017.04.24
  • Accepted : 2017.09.08
  • Published : 2018.01.01

Abstract

The $Li_4Ti_5O_{12}$ of anode material for the hybrid capacitor was coated using $CePO_4$, $M_3(PO_4)_2$ (M=Mg, Zn). The capacitance of phosphate coated $Li_4Ti_5O_{12}$ was found to be lower than that of $Li_4Ti_5O_{12}$, whereas the equivalent series resistance was higher than that of $Li_4Ti_5O_{12}$. With an increase in cycle number, the base of cylindrical cell exhibited swelling due to gas generated from the reaction between $Li_4Ti_5O_{12}$ and electrolyte. The swelling cycle number of phosphate coated $Li_4Ti_5O_{12}$ was higher than that of $Li_4Ti_5O_{12}$ due to improvement in electrochemical stability. Based on the results, it is proposed that phosphate coating can be employed as a barrier layer to control the gassing reaction by isolating the $Li_4Ti_5O_{12}$ particle from electrolyte solution.

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Fig. 1. The X-ray diffraction patterns of Li4Ti5O12 andsurface coated Li4Ti5O12

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Fig. 2. The SEM micrographs of Li4Ti5O12 and surfacecoated Li4Ti5O12 ((a) Li4Ti5O12, (b) C-LTO, (c) M-LTO, (d) Z-LTO)

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Fig. 3. The (a) capacitance and (b) equivalent seriesresistance of the hybrid capacitor prepared byemploying different coating materials

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Fig. 4. The cycle performance of the hybrid capacitoremploying different coating materials at differentcurrent rates ((a) discharge capacity, (b) DC-ESR)

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Fig. 5. The cycle performance of the hybrid capacitorprepared by employing different coating materials

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Fig. 6. AC Impedance spectra of the hybrid capacitor withdifferent coating materials over a frequency rangeof 10-2 to 103Hz ((a) before electrochemical cycle,(b) after 5000th electrochemical cycle)

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Fig. 7. The photographs of cylindrical cell of the electro-chemical cycle test ((a) before electrochemicalcycle, (b) after 5000th electrochemical cycle)

Table 1. The capacitance and equivalent series resistance of the hybrid capacitor prepared by employing different coating materials

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Table 2. The swelling cycle number of the hybrid capacitor prepared by employing different coating materials

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Acknowledgement

Supported by : NST (National Research Council of Science & Technology)

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