Author : Chuanzhong Lai
Publisher : OAE Publishing Inc.
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4./5 ( download)
Book Synopsis Scissor g-C3N4 for high-density loading of catalyst domains in mesoporous thin-layer conductive network for durable Li-S batteries by : Chuanzhong Lai
Download or read book Scissor g-C3N4 for high-density loading of catalyst domains in mesoporous thin-layer conductive network for durable Li-S batteries written by Chuanzhong Lai and published by OAE Publishing Inc.. This book was released on 2023-05-29 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of Li-S batteries (LSBs) is hindered by the undesired shuttle effect that leads to the fast consumption of active materials. The separator modification by using the carbon matrix with embedded metal nitride as catalyst can ease the problem. However, the previous synthesis processes of metal nitride catalysts are difficult to achieve a balance between their high-density production, homogenous distribution and excellent electronic contact with conductive substrates. Herein, we propose a bond scissoring strategy based on g-C3N4 to prepare NbN catalyst domains with high-density loading uniformly embedded in mesoporous thin-layer conductive carbon network (NbN/C) for durable LSBs. The molten salt reaction process is favorable for the diffusion of Nb cations into a porous g-C3N4 precursor to break the C-N bond and immobilize the N element. The residual monolithic carbon framework with space confinement effect limits the irregular growth and stacking of NbN precipitates. The NbN catalytic domains exhibit a strong adsorption effect on lithium polysulfides (LiPSs) and accelerate their liquid-solid conversion reactions. The LSBs utilizing an NbN/C-modified separator show superior cycling and rate performance, with a high-capacity retention of 72.7% after 1,000 cycles under 2 C and a high areal capacity of ~7.08 mA h cm-2 under a high sulfur loading of 6.6 mg cm-2. This g-C3N4-assisted strategy opens a new gate for the design of an integrated catalysis-conduction network for high-performance LSBs.
