Cobalt doped JUC-160 derived functional carbon superstructures with synergetic catalyst effect for Li-SeS2 batteries

• Published in: Microporous and mesoporous materials Vol. 306; p. 110438
• Main Authors: Jin, Wen-wu, Li, He-Jun, Zou, Ji-zhao, Zhang, Qi, Inguva, Saikumar, Zeng, Shao-zhong, Xu, Guo-zhong, Zeng, Xie-rong
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 15.10.2020
• Subjects: Cobalt-doped; Crystal-shape engineering; Li-SeS2; Self-assembled; ZIF; Crystal-shape engineering; Self-assembled; ZIF; Li-SeS2; Cobalt-doped
• ISSN: 1387-1811; 1873-3093
• DOI: 10.1016/j.micromeso.2020.110438

The carbon nanostructures with polar metal/heteroatom co-doping are considered as an effective strategy to improve their electrochemical performances. In this context, the crystal-shape engineering is carried out. Based on a new ‘‘one for six’’ strategy, the JUC-160 having a two-dimensional (2D) zeolitic imidazolate framework is transformed into six different carbon materials. These materials do not need a carbon activation process or template removal process. Instead, after a simple carbonization, a series of metal/heteroatom co-doped carbon materials with novel structures are formed. To be highlighted, this work is the first report of using self-assembled carbon nanostructures/SeS2 composites as cathode materials in the field of Li-SeS2. Moreover, those carbon nanostructures can be effectively tailored by adjusting the method of cobalt doping and the amount of cobalt dopant. Because of the benefits from the novel structures and cobalt/nitrogen co-doping, the dissolution of poly-sulfides/selenides is reduced and a high content of SeS2 (73 wt%) is achieved. The optimized cathode displays an extraordinary cycle performance with a reversible capacity of 820.87 mA h g−1 after 100 cycles, and with reversible charge-discharge efficiency is close to 100%. [Display omitted] •Open-book-like carbon nanostructures were designed for the first time.•Template-free preparation of self-assembled carbon nanostructures with cobalt/nitrogen co-doped was presented.•For the first time, self-assembled carbon nanostructures/SeS2 composites were used as cathode for Li-SeS2 batteries.•Physical-chemical properties of the carbon nanostructures can be further tailored.