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Immobilizing Polysulfide by In Situ Topochemical Oxidation Derivative TiC@Carbon-Included TiO2 Core-Shell Sulfur Hosts for Advanced Lithium-Sulfur Batteries.
Zhang, Xiaoqing; Yuan, Wei; Yang, Yang; Chen, Yu; Tang, Zhenghua; Wang, Chun; Yuan, Yuhang; Ye, Yintong; Wu, Yaopeng; Tang, Yong.
Afiliação
  • Zhang X; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
  • Yuan W; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
  • Yang Y; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
  • Chen Y; School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
  • Tang Z; School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
  • Wang C; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
  • Yuan Y; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
  • Ye Y; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
  • Wu Y; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
  • Tang Y; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China.
Small ; 16(52): e2005998, 2020 Dec.
Article em En | MEDLINE | ID: mdl-33258313
ABSTRACT
The performance of lithium-sulfur (Li-S) batteries is greatly hindered by the notorious shuttle effect of lithium polysulfides (LiPSs). To address this issue, in situ topochemical oxidation derivative TiC@carbon-included TiO2 (TiC@C-TiO2 ) core-shell composite is designed and proposed as a multifunctional sulfur host, which integrates the merits of conductive TiC core to facilitate the redox reaction kinetics of sulfur species, and porous C-TiO2 shell to suppress the dissolution and shuttling of LiPSs through chemisorption. A unique dual chemical mediation mechanism is demonstrated for the proposed TiC@C-TiO2 composite that synergistically entraps LiPSs through thiosulfate/polythionate conversion coupled with strong polar-polar interaction. The morphological characterization reveals that the TiC@C-TiO2 -based cathode can well regulate the distribution of electrode materials to retard their accumulation inside the electrode, ensuring effective contact between the active materials and electrolyte. Based on its unique function and structure, the cathode delivers an improved capacity of 1256 mAh g-1 at 0.2C, a remarkable rate capability of 643 mAh g-1 , and an ultralow capacity decay rate of 0.065% per cycle at 2C over 900 cycles. This work not only demonstrates a dual chemical mediation mechanism to immobilize LiPSs, but also provides a universal strategy to construct multifunctional sulfur hosts for advanced Li-S batteries.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Small Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Small Ano de publicação: 2020 Tipo de documento: Article