Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 54, Issue -, Pages 16-22Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2020.05.007
Keywords
Titanium nitride; Nitrogen-doped graphene; Catalysis effects; Adsorption capability; Lithium-sulfur batteries
Funding
- National Natural Science Foundation of China [51761145046, 21975243, 51672262]
- 100 Talents Program of the Chinese Academy of Sciences
- National Program for Support of Top-notch Young Professional
- iChEM
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A TiN@NG/S composite material has been developed to effectively suppress the shuttle effect in lithium-sulfur batteries, improving capacity and cycling performance.
Lithium-sulfur (Li-S) batteries have become prospective candidates for next-generation energy storage owing to the high energy density and low cost. However, the sluggish kinetics of the electrochemical reaction and shuttle effect result in a rapid capacity decay. Herein, a titanium nitride nanocrystal/N-doped graphene (TiN@NG) composite is developed to host elemental sulfur. The TiN nanoparticles decorated on graphene sheets attract Li polysulfides (LiPSx) and catalyze the electrochemical reduction and oxidation of LiPSx in the discharge and charge processes, respectively. These two effects effectively restrain the dissolution of the UPS, and accelerate the electrochemical reactions, thereby, alleviating the shuttle effect. As a result, the cathode composed of TiN@NG/S delivers a remarkable reversible capacity (1390 mA h g(-1) at 0.1 C) and excellent cycling performance (730 mA h g(-1) after 300 cycles). We believe that this work can bring some inspiration for designing high-performance Li-S batteries. (C) 2020 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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