Ultrafine Co3Se4 Nanoparticles in Nitrogen‐Doped 3D Carbon Matrix for High‐Stable and Long‐Cycle‐Life Lithium Sulfur Batteries. Issue 19 (3rd April 2020)

• Record Type: Journal Article
• Authors: Cai, Dong; Liu, Bingke; Zhu, Dehua; Chen, Duo; Lu, Mengjie; Cao, Junming; Wang, Yanhu; Huang, Wenhao; Shao, Yong; Tu, Haoran; Han, Wei
• Is Part Of: Advanced energy materials. Volume 10:Issue 19(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-04-03
• Subjects: Co3Se4 -- lithium–sulfur batteries -- long‐term cycling -- nitrogen‐doped interconnected carbon; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201904273
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: Lithium–sulfur batteries are a promising high energy output solution for substitution of traditional lithium ion batteries. In recent times research in this field has stepped into the exploration of practical applications. However, their applications are impeded by cycling stability and short life‐span mainly due to the notorious polysulfide shuttle effect. In this work, a multifunctional sulfur host fabricated by grafting highly conductive Co3 Se4 nanoparticles onto the surface of an N‐doped 3D carbon matrix to inhibit the polysulfide shuttle and improve the sulfur utilization is proposed. By regulating the carbon matrix and the Co3 Se4 distribution, N‐CN‐750@Co3 Se4 ‐0.1 m with abundant polar sites is experimentally and theoretically shown to be a good LiPSs absorbent and a sulfur conversion accelerator. The S/N‐CN‐750@Co3 Se4 ‐0.1 m cathode shows excellent sulfur utilization, rate performance, and cyclic durability. A prolonged cycling test of the as‐fabricated S/N‐CN‐750@Co3 Se4 ‐0.1 m cathode is carried out at 0.2 C for more than 5 months which delivers a high initial capacity of 1150.3 mAh g −1 and retains 531.0 mAh g −1 after 800 cycles with an ultralow capacity reduction of 0.067% per cycle, maintaining Coulombic efficiency of more than 99.3%. The reaction details are characterized and analyzed by ex situ measurements. This work highly emphasizes the potential capabilities of transition‐metal selenides in lithium–sulfur batteries. Abstract : A highly conductive and catalytic Co3 Se4 nanoparticle is grafted on the surface of an N‐doped 3D carbon matrix. By regulating the carbon matrix and the Co3 Se4 distribution, the N‐CN‐750@Co3 Se4 ‐0.1 m is employed as an advanced sulfur host for lithium–sulfur batteries. It delivers an excellent rate and cycling performance even after 5 months of successive operation, suggesting effective inhibition of polysulfide shuttle effects.