Citation: Keke Gao, Rui Xu, Yunxiang Chen, Zongtao Zhang, Jiashuo Shao, Haipeng Ji, Liying Zhang, Shasha Yi, Deliang Chen, Junhua Hu, Yanfeng Gao. TiO₂-carbon porous nanostructures for immobilization and conversion of polysulfides[J]. Chinese Chemical Letters, ;2023, 34(1): 107229. doi: 10.1016/j.cclet.2022.02.034 shu

TiO₂-carbon porous nanostructures for immobilization and conversion of polysulfides

Keke Gao ^{a, 1} ,
Rui Xu ^{a, 1} ,
Yunxiang Chen ^a ,
Zongtao Zhang ^{a, *,} ,
Jiashuo Shao ^a ,
Haipeng Ji ^a ,
Liying Zhang ^a ,
Shasha Yi ^a ,
Deliang Chen ^a ,
Junhua Hu ^a ,
Yanfeng Gao ^{a, b}

a.
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
b.
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

ztzhang@zzu.edu.cn

Received Date: 9 December 2021
Revised Date: 13 January 2022
Accepted Date: 15 February 2022
Available Online: 19 February 2022

Figures(7)

Lithium-sulfur batteries (LSBs) are among the most promising series of next-generation high density energy storage systems. However, the problem of "shuttle effect" caused by dissolution and migration of polysulfide intermediates has severely inhibited their practical applications. Herein, TiO₂-carbon nanocomposites embedded hierarchical porous carbon (T-hPC) interlayers are fabricated via Ti₃C₂ MXene assisted phase separation and annealing method. The T-hPC processes micro- to macro-scale multi-pores along with highly adsorptive and catalytic carbon supported TiO₂ nanoparticles, which significantly enhances the polysulfides immobilization and improves the redox reaction kinetics when applied as lithium-sulfur battery interlayers. An initial discharge specific capacity of 1551.1 mAh/g and a stable capacity of 893.8 mAh/g after 200 cycles at 0.5 C are obtained, corresponding to a capacity decay rate of only 0.04% per cycle. The investigations in this paper can provide a simple and effective strategy to enhance the electrochemical properties for lithium-sulfur batteries.
- Hierarchical porous carbon,
- Phase separation,
- MXene,
- Interlayer,
- Lithium-sulfur battery
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TiO2-carbon porous nanostructures for immobilization and conversion of polysulfides

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TiO₂-carbon porous nanostructures for immobilization and conversion of polysulfides