期刊
CHEMICAL ENGINEERING JOURNAL
卷 427, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131774
关键词
N-doped CNT-graphene; Metal nitride heterostructure; Nanocatalyst; Li-S battery; Density functional theory
资金
- National Research Foundation (NRF) - Ministry of Science and ICT of the Republic of Korea [2017R1A2B3004917, 2019R1A5A8080326]
A novel in-situ one-step approach was used to prepare a highly catalytic lithium-sulfur battery cathode material, which exhibited exceptional capacity performance at 0.1C rate and long cycle-life for 500 cycles.
The lithium-sulfur battery is emerging as a promising alternative for the state-of-the-art lithium-ion battery because of its high theoretical specific capacity. However, the shuttle effect results from a sluggish conversion reaction of lithium polysulfides (LiPSs), reduces the sulfur utilization, promptly capacity degradation, and thus prevents its industrial application. Recently, the development of catalysts that can accelerate the conversion reaction of LiPSs has received tremendous attention. Herein, we use a novel in-situ one-step approach to prepare the Co5.42N/Fe3N heterostructure wrapped with the 3D nitrogen-doped carbon nanotube and graphene framework (3D Co5.42N/Fe3N@N-CNT-G). Density functional theory (DFT) calculation suggests that the formation of Co5.42N/Fe3N heterostructures could improve the density of states at the Fermi level, which enhances the redox kinetics, LiPS conversion and adsorption capability. The combination of highly catalytic activity Fe3N and adsorptive Co5.42N in the abundant-heterojunctions Co5.42N/Fe3N nanostructure provide an effective trapping host and conversion catalyst for LiPS. Moreover, 3D N-CNT-G framework with high surface area serves as a highly conductive channel for electron transport and promote the Li2S nucleation. The sulfur-loaded 3D Co5.42N/Fe3N@N-CNT-G cathode exhibits an exceptional capacity of similar to 1293 mAh g(-1) at 0.1C and long cycle-life for 500 cycles (capacity fading of 0.029% per cycle at 1C).
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