Electrochemical Performance of Hydroxylated Multi-walled Carbon Nanotube Sandwich Separator in Lithium-sulfur Battery†

doi:10.7503/cjcu20180067

Abstract

Abstract:

Hydroxylated multi-walled carbon nanotube cellulose paper(MWCNTs-OHP) was obtained by vacuum filtration of hydroxylated multi-walled carbon nanotubes(MWCNTs-OH) and paper fibers. A multi-functional PP@MWCNTs-OHP@PP sandwich separator was formed by MWCNTs-OHP cellulose paper sandwiching between two polypropylene(PP) membranes and was used in lithium-sulfur battery. The morphology and structure of PP@MWCNTs-OHP@PP were characterized by transmission electron microscopy(TEM), scanning electron microscopy(SEM), infrared spectroscopy and energy dispersive spectroscopy(EDS). The electrochemical test showed that the initial discharge capacity of Li-S batteries with the PP@MWCNTs-OHP@PP sandwich separator reached to 1532 mA·h/g and the utilization rate of active substances reached 91.5%. The capacity still maintained 516 mA·h/g at 1C after 500 cycles with stabilized coulombic efficiency above 96.4% and slow capacity decay rate of 0.028% per cycle. As the charge-discharge rate decreased from 3C to 0.1C, the discharge capacity recovered from 336 mA·h/g to 820 mA·h/g, showing excellent magnification.

Key words: Lithium-sulphur battery, Multi-walled carbon nanotube, Hydroxyl, Separator, Shuttle effect, Lithium polysulfur

CLC Number:

O646

TrendMD:

WANG Jie, SUN Xiaogang, CHEN Wei, LI Xu, HUANG Yapan, WEI Chengcheng, HU Hao, LIANG Guodong. Electrochemical Performance of Hydroxylated Multi-walled Carbon Nanotube Sandwich Separator in Lithium-sulfur Battery^†[J]. Chem. J. Chinese Universities, 2018, 39(8): 1782.

Figures/Tables 9

Fig.1 Structure diagram of lithium-sulphur battery with PP@MWCNTs-OHP@PP sandwich separator

Fig.2 SEM(A) and TEM(B) images of the MWCNTs

Fig.3 SEM images of the cathode(A) and MWCNTs-OHP(B,C,D)(B) MWCNTs-OHP; (C) upper sarface of MWCNTs-OHP; (D) cross section of MWCNTs-OHP.

Fig.4 FTIR spectra of MWCNTs-OH and MWCNTs

Fig.5 Cyclic curves of lithium-sulphur battery with PP@MWCNTs-OHP@PP separator

Fig.6 Charging-discharging curves(A, B) and cycle performance(C) of lithium-sulphur batteries

Fig.7 Long cycling performance of lithium-sulphur battery at 1C

Fig.8 Comparison of the EIS of before(A) and after(B) 100 cycles charge and discharge testInsets are equivalent circuit diagrams.

Fig.9 SEM images of cathodes(A—C) and PP@MWNTs-OHP@PP separator(D) after 100 cycles(A) With PP@MWNTs-OHP@PP separator; (B) with PP@MWNTsP@PP seporator; (C) with PP@PP separator.

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