Titanium nitride hollow nanospheres with strong lithium polysulfide chemisorption as sulfur hosts for advanced lithium-sulfur batteries

作     者：Chuanchuan Li Jingjing Shi Lin Zhu Yingyue Zhao Jun Lu Liqiang Xu 

作者机构：Key Laboratory of Colloid & Interface Chemistry (Shandong University) Ministry of Education School of Chemistry and Chemical Engineering Shandong University Jinan 250 I00 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University Tianjin 300071 China Faculty of Science Beijing University of Chemical Technology Beijing 100029 China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2018年第11卷第8期

页      面：4302-4312页

核心收录：

学科分类：080706[工学-化工过程机械] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：国家自然科学基金 国家教育部高等学校学科创新引智计划项目 the Fundamental Research Funds of Shandong University Academy of Sciences large apparatus United Fund the Taishan Scholar Project of Shandong Province 

主　　题：TiN hollow spheres lithium-sulfur batteries polysulfide trapping density functional theory(DFT) calculations 

摘      要：Lithium-sulfur batteries are promising electrochemical energy storage devices because of their high theoretical specific capacity and energy density. An ideal sulfur host should possess high conductivity and embrace the physical confinement or strong chemisorption to dramatically suppress the polysulfide dissolution. Herein, uniform TiN hollow nanospheres with an average diameter of N 160 nm have been reported as highly efficient lithium polysulfide reservoirs for high-performance lithium-sulfur batteries. Combining the high conductivity and chemical trapping of lithium polysulfides, the obtained S/TiN cathode of 70 wt.% sulfur content in the composite delivered an excellent long-life cycling performance at 0.5C and 1.0C over 300 cycles. More importantly, a stable capacity of 710.4 mAh.g-1 could be maintained even after 100 cydes at 0.2C with a high sulfur loading of 3.6 mg-cm-1 The nature of the interactions between TiN and lithium polysulfide species was investigated by X-ray photoelectron spectroscopy studies. Theoretical calculations were also carried out and the results revealed a strong binding between TiN and the lithium polysulfide species. It is expected that this dass of conductive and polar materials would pave a new way for the high-energy lithium-sulfur batteries in the future.