Propelling polysulfide redox by Fe_(3)C-FeN heterostructure@nitrogendoped carbon framework towards high-efficiency Li-S batteries  

作　　者：Mengdi Zhang Jiawei Mu Yanan Li Yuanyuan Pan Zhiliang Dong Bei Chen Shiwei Guo Wenhan Yuan Haiqiu Fang Han Hu Mingbo Wu 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,College of New Energy,China University of Petroleum(East China),Qingdao 266580,Shandong,China [2]College of Physics,University-Industry Joint Center for Ocean Observation and Broadband Communication,State Key Laboratory of Bio-Fibers and Eco Textiles,Qingdao University,Qingdao 266071,Shandong,China

出　　处：《Journal of Energy Chemistry》2023年第3期105-114,I0004,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(22005341 and 22138013);the Shandong Provincial Natural Science Foundation(ZR2020QB128 and ZR2020ZD08);the Taishan Scholar Project(ts201712020);the Major Scientific and Technological Innovation Project of Shandong Province(2020CXGC010402);the Independent Innovation Research Project of China University of Petroleum(22CX06026A)。

摘　　要：Lithium-sulfur(Li-S) batteries hold great promise in next-generation high-energy-density energy storage systems,but the intractable shuttle effect and the sluggish redox kinetics of polysulfides hinder the practical implementation of Li-S batteries.Here,heterostructured Fe_(3)C-FeN nanoparticles dotted in the threedimensional-ordered nitrogen-doped carbon framework(Fe_(3)C-FeN@NCF) were synthesized by molecular engineering combined with heterointerface engineering,and were applied to regulate the immobilization-diffusion-conversion behavior of polar polysulfides.It is experimentally and theoretically demonstrated that the heterointerface between Fe_(3)C and FeN exhibits high sulfiphilicity and high electronic/ionic conductivity,thus effectively capturing polysulfides and accelerating the bidirectional conversion of sulfur species.Meanwhile,the holey carbon framework functions as the scaffold to highly disperse binary nanoparticles,ensuring the sufficient exposure of active sites and the easy accessibility for lithium ions and electrons.By virtue of these synergistic merits,the Li-S batteries based on Fe_(3)CFeN@NCF-modified separators afford excellent electrochemical performances including a high rate capacity of 858 mA h g^(-1)at 2 C and a low capacity decay rate of 0.07% per cycle after 800 cycles at 1C This work provides inspiration for the design of heterostructured compounds and sheds light on the potential of heterostructure in high-efficiency Li-S batteries.

关 键 词：Lithium-sulfur batteries Separator modification Heterostructured catalysts Carbon composites Shuttle effect 

分 类 号：TM912[电气工程—电力电子与电力传动] O643.36[理学—物理化学]