The use of a conducting interlayer between separator and cathode is one of the most promising methods to trap lithium polysulfides (LiPSs) for enhancing the performance of lithium–sulfur (Li–S) batteries. Red phosphorus nanoparticles (RPEN)-coated carbon nanotube (CNT) film (RPEN@CF) is reported herein as a novel interlayer for Li–S batteries, which shows strong chemisorption of LiPSs, good flexibility, and excellent electric conductivity. A pulsed laser ablation method is engaged for the ultrafast production of RPEN of uniform morphology, which are deposited on the CNT film by a direct spinning method. The RPEN@CF interlayer provides pathways for effective Li+ and electron transfer and strong chemical interaction with LiPSs. The S/RPEN@CF electrode shows a superior specific capacity of 782.3 mAh g−1 (3 C-rate) and good cycling performances (769.5 mAh g−1 after 500 cycles at 1 C-rate). Density functional theory calculations reveal that the morphology and dispersibility of RPEN are crucial in enhancing Li+ and electron transfer kinetics and effective trap of LiPSs. This work demonstrates the possibility of using the RPEN@CF interlayer for the enhanced electrochemical performances of Li–S batteries and other flexible energy storage devices.
Bibliographical noteFunding Information:
This work was supported by the Innovation and Technology Commission of Hong Kong, Research Institute for Smart Energy of the Hong Kong Polytechnic University (Grant No. Q‐CDA3), the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (Grant No. NRF‐2020R1A2C2006720), and the Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) of NRF funded by the Ministry of Science and ICT (Project No. 2013M3A6B1078882).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)