Application of Porous Black Titanium Dioxide with Oxygen Vacancy/Polyethylene as a Composite Separator for Lithium Sulfur Batteries†

doi:10.7503/cjcu20200057

Abstract

Abstract:

In this work, a mesoporous black titanium dioxide(b-TiO₂) with highly ordered oxygen vacancy was synthesized by two-step solution method and coated on the surface of polyethylene separator to obtain the composite separator for lithium-sulfur(Li-S) battery. The electrochemical performance of the Li-S battery with this composite separator was studied. The results show that the mesoporous b-TiO₂ presents a good conductivity due to oxygen vacancy, and can enhance the physical and chemical adsorption of polysulfide, thus the obtained Li-S batteries possess excellent discharge specific capacities(1257 mA·h/g at 0.1C) and outstan-ding cycling performance(discharge specific capacity 821 mA·h/g after 100 cycles).

Key words: Lithium-sulfur battery, Composite separator, Titanium dioxide, Polysulfide, Cycling performance

CLC Number:

O646

TrendMD:

WU Tong, CONG Lina, SUN Liqun, XIE Haiming. Application of Porous Black Titanium Dioxide with Oxygen Vacancy/Polyethylene as a Composite Separator for Lithium Sulfur Batteries^†[J]. Chem. J. Chinese Universities, 2020, 41(7): 1661.

Figures/Tables 12

References 47

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Cycle number	Unmodified separator			b-TiO₂ Modified separator
Cycle number	R₀/Ω	R_ct/Ω	R_SEI/Ω	R₀/Ω	R_ct/Ω	R_SEI/Ω
0	0.10	22.9	—	0.11	20.1	—
5	0.09	33.1	14.3	0.15	21.7	10.4
25	0.11	53.8	19.7	0.09	24.3	26.3
100	0.10	85.9	28.9	0.10	16.7	25.8

Cycle number	Unmodified separator			b-TiO₂ Modified separator
Cycle number	R₀/Ω	R_ct/Ω	R_SEI/Ω	R₀/Ω	R_ct/Ω	R_SEI/Ω
0	0.10	22.9	—	0.11	20.1	—
5	0.09	33.1	14.3	0.15	21.7	10.4
25	0.11	53.8	19.7	0.09	24.3	26.3
100	0.10	85.9	28.9	0.10	16.7	25.8