High performance lithium-sulfur batteries with facile titanium nitride particles modified separator

[Display omitted] •Micro size Titanium nitride particles were synthesized through a low cost and facile way.•TiN was first applied into the modified separator without any addition of conductive agent.•The TiN modified separator electrode has high discharge capacity (1296 mAh/g). Rechargeable lithium...

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Bibliographic Details
Published in:Materials letters 2018-03, Vol.215, p.91-94
Main Authors: He, Xuan, Shuai, Yi, Na, Li, Chen, Kanghua, Zhang, Youqiang, Zhang, Zeping, Gan, Fangyu
Format: Article
Language:English
Subjects:
Batteries
Conductivity
Decay rate
Design modifications
Discharge
Energy storage
High content sulfur
Lithium
Lithium sulfur batteries
Low conductivity
Materials science
Modified separator
Polysulfides
Potential energy
Rechargeable batteries
Stability
Storage batteries
Strong interactions (field theory)
Sulfur
Titanium nitride
Titanium nitride particles
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Summary:[Display omitted] •Micro size Titanium nitride particles were synthesized through a low cost and facile way.•TiN was first applied into the modified separator without any addition of conductive agent.•The TiN modified separator electrode has high discharge capacity (1296 mAh/g). Rechargeable lithium-sulfur (Li-S) batteries are considered as one of the most potential energy storage devices owing to their high theoretical capacity, environmental friendliness and low cost. However, the practical applications of Li-S batteries are restricted by the low conductivity of sulfur, serious dissolution of intermediate polysulfides and fast capacity degradation. Herein, we design a titanium nitride (TiN) modified separator to improve the long-term cycle stability and discharge capacity of Li-S batteries. Strong interaction between the TiN particles and polysulfides can greatly restrain the “shuttle effect” and benefit the cycle stability. With this modified separator, cathodes with a sulfur loading of 78.1% could deliver a high initial discharge capacity of 1296 mAh/g and demonstrate a decay rate of 0.17% per cycle under a high current density of 0.5C. Such superior electrochemical performances ascribe to the high conductivity of TiN and strong affinity between TiN particles and polysulfides.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2017.12.069