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

ABSTRACT: 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.

SUBMITTER: Yang ZZ 

PROVIDER: S-EPMC4786857 | biostudies-other | 2016 Mar

REPOSITORIES: biostudies-other

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

Yang Zhi-Zheng ZZ   Wang Hui-Yuan HY   Lu Lun L   Wang Cheng C   Zhong Xiao-Bin XB   Wang Jin-Guo JG   Jiang Qi-Chuan QC  

Scientific reports 20160311

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)  ...[more]