Hierarchical TiO2 spheres as highly efficient polysulfide host for lithium-sulfur batteries

Hierarchical TiO2 spheres as highly efficient polysulfide host for lithium-sulfur batteries

Hierarchical TiO2 micron spheres assembled by nano-plates were prepared through a facile hydrothermal route. Chemical tuning of the TiO2 through hydrogen reduction (H-TiO2) is shown to increase oxygen-vacancy density and thereby modifies the electronic properties. H-TiO2 spheres with a polar surface...

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Bibliographic Details
Main Authors: Yang, Zhi-Zheng, Wang, Hui-Yuan, Lu, Lun, Wang, Cheng, Zhong, Xiao-Bin, Wang, Jin-Guo, Jiang, Qi-Chuan
Format: Online
Language:English
Published: Nature Publishing Group 2016
Online Access:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4786857/
Description
Summary:Hierarchical TiO2 micron spheres assembled by nano-plates were prepared through a facile hydrothermal route. Chemical tuning of the TiO2 through hydrogen reduction (H-TiO2) is shown to increase oxygen-vacancy density and thereby modifies the electronic properties. H-TiO2 spheres with a polar surface serve as the surface-bound intermediates for strong polysulfides binding. Under the restricting and recapturing effect, the sulfur cathode could deliver a high reversible capacity of 928.1 mA h g−1 after 50 charge-discharge cycles at a current density of 200 mA g−1. The H-TiO2 additive developed here is practical for restricting and recapturing the polysulfide from the electrolyte.

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