Preparation and Electrochemical Property of Polyaniline Coated Opal Shale/Sulfur Composite

doi:10.15541/jim20170023

Abstract

Abstract:

Opal shale/S composite was prepared by loading sulfur on opal shale via solution-based reaction- deposition method, and then polyaniline (PANI) was covered on the as-prepared opal shale/S composite by means of chemical oxidative polymerization method, which was used as cathode material of lithium-sulfur battery. Scanning electron microscope (SEM), transmission electron microscope (TEM), and Brunauer-Emmett-Teller (BET) characterization were conducted, and the results indicated that opal shale had a layered porous structure. As-prepared sulfur with small size was distributed uniformly in the composite. The PANI with around thickness of 400 nm was coated on the surface of the opal shale/S composite. Constant current charge-discharge tests showed that opal shale/S-PANI cathode obtained a maximum discharge specific capacity of 1164.93 mAh/g after activation and retained a discharge specific capacity of 539.30 mAh/g after 300 cycles at the current rate of 0.5C (1.0C=1675 mA/g). The coulombic efficiency of opal shale/S-PANI cathode always maintained more than 95%, indicating that opal shale with excellent adsorption properties and conductive PANI coating had double fixation effect for sulfur, which was beneficial to adsorb polysulfide and inhibit the shuttle effect.

Key words: opal shale, polyaniline, cathode material, lithium-sulfur battery

CLC Number:

O646

CHAI Er-Ya, PAN Jun-An, YUAN Guo-Long, CHENG Hao, AN Feng, XIE Shu-Hong. Preparation and Electrochemical Property of Polyaniline Coated Opal Shale/Sulfur Composite[J]. Journal of Inorganic Materials, 2017, 32(11): 1165-1170.

Figures/Tables 8

Fig. 1 XRD patterns of S (a), opal shale (b), opal shale/S (c) and opal shale/S-PANI (d)

Fig. 2 SEM and TEM morphologies of opal shale (a,b), opal shale/S (c, d), and opal shale/S-PANI (e, f), respectively

Fig. 3 Nitrogen adsorption-desorption isotherms (a) and BJH pore size distribution (b) of opal shale, opal shale/S and opal shale/S-PANI

Fig. 4 Thermo gravimetric analysis (TGA) curve of opal shale/S-PANI

Fig. 5 (a) Cycling performance and the corresponding coulombic efficiency at 0.5C rate; (b) rate capability under different discharge rate of the opal shale/S and opal shale/S- PANI

Fig. 6 Cyclic voltammetry curves of opal shale/S-PANI after the first cycle and 300th cycle at 0.5C rate

Fig. 7 Galvanostatic discharge-charge profiles of opal shale/ S-PANI at 0.5C rate

Fig. 8 Electrochemical impedance spectroscopy of opal shale/S- PANI after the first cycle and 300th cycle at 0.5C rate

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