Preparation of TiO2/CNTs Composite Coated Separator and Its Application in Li-S Battery†

doi:10.7503/cjcu20180514

Abstract

Abstract:

Porous TiO₂ was prepared with metal-organic framework MIL-125(Ti) as template, and CNTs were introduced to form the three-dimensional conductive TiO₂/CNTs composite. The TiO₂/CNTs composite was coated on one side of the separator and applied in lithium-sulfur battery. The morphology and elemental composition of TiO₂ were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM) and X-ray photoelectron spectroscopy(XPS). The CNTs/S cathodes with TiO₂/CNTs composite coated separator deliver a high initial discharge capacity of 1051.1 mA·h/g and still retain a capacity of 904.8 mA·h/g after 150 cycles at 0.5C. Even at 1C, the capacity is still up to 1036.9 mA·h/g, and a high capacity of 763.0 mA·h/g is retained after 250 cycles, showing good rate performance.

Key words: Li-S battery, Metal-organic framework, Chemical adsorption

CLC Number:

O646

TrendMD:

GUAN Yibiao,LI Wanlong,XIE Xiaoyi,QU Wei,SHEN Jinran,FU Kai,GUO Cuijing,ZHOU Shuqin,FAN Hongjia,CHU Yongjin,CHEN Renjie. Preparation of TiO₂/CNTs Composite Coated Separator and Its Application in Li-S Battery^†[J]. Chem. J. Chinese Universities, 2019, 40(3): 536.

Figures/Tables 7

Fig.1 SEM images of MIL-125(A, B), porous TiO2(C, D) and separator coated with TiO2/CNTs composite material(enlarged in the inset)(E)

Fig.2 TEM images of MIL-125(A), porous TiO2 (B), and HRTEM images of porous TiO2(C, D)

Fig.3 XRD patterns of MIL-125(a) and TiO2(b)

Fig.4 Nitrogen adsorption-desorption isotherm and pore size distribution(inset) of porous TiO2

Fig.5 Survey(A) and Ti2p(B) XPS spectra of porous TiO2 spectrum

Fig.6 CV curves of lithium-sulfur battery with TiO2/CNTs coated separator(A) and EIS spectra of lithium-sulfur batteries with different separators(B)

Fig.7 The first cycle charge-discharge curves of lithium-sulfur battery with TiO2/CNTs coated separator(A) and cycle performance of lithium-sulfur batteries with different separators at 0.5C(B) and 0.1C(C)a. TiO2/CNTs coated separator; b. CNTs coated separator; c. raw separator.

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Preparation of TiO₂/CNTs Composite Coated Separator and Its Application in Li-S Battery^†

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