TiN nanocrystal anchored on N-doped graphene as effective sulfur hosts for high-performance lithium-sulfur batteries

• 作者: Wenmiao Chen Hongchang Jin Shuai Xie Huanyu Xie Junfa Zhu Hengxing Ji Li-Jun Wan
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（3）
• 页码范围: 16-22
• 页数: 7页
• 语种: 英文

摘要

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 dec-orated on graphene sheets attract Li polysulfides(LiPSx)and catalyze the electrochemical reduction and oxidation of Li PSx in the discharge and charge processes,respectively.These two effects effectively restrain the dissolution of the LiPSx and accelerate the electrochemical reactions,thereby,alleviating the shuttle effect.As a result,the cathode composed of TiN@NG/S delivers a remarkable reversible capac-ity(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.