Biomass-derived self-supporting sulfur host with NiS/C composite for high-loading Li-S battery cathode  

作　　者：LIU LuZhi XIA GuangHui WANG Ding HUANG JieMeng DUAN JianGuo ZHANG YiYong DONG Peng ZHANG YingJie 

机构地区：[1]National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology,Key Laboratory of Advanced Battery Materials of Yunnan Province,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China [2]College of Materials Science and Engineering,Sichuan University,Chengdu 610065,China

出　　处：《Science China(Technological Sciences)》2023年第1期181-192,共12页中国科学（技术科学英文版）

基　　金：financially supported by the Major Science and Technology Projects of Yunnan Province(Grant No.202202AG050003);the Key Research and Development Program of Yunnan Province(Grant No.202103AA080019);the National Natural Science Foundation of China(Grant Nos.51904135,52162030);the Scientific Research Fund of Highend Talents Introduction of Kunming University of Science and Technology(Grant No.KKKP201752027);the Yunnan Thousand Talents Program for Young Talents(Grant No.KKS2202052001)。

摘　　要：High sulfur loading is a practical way to realize the advantages of high energy density lithium-sulfur(Li-S)batteries.Herein,we report a biomass-derived flexible self-supporting carbon(SSC)coupled with Ni S/C used as a sulfur host for high-efficiency sulfur storage.A high areal sulfur loading of 5.3 mg cm-2can be achieved in the as-prepared composite host,and physical/chemical dual blocking effects for polysulfides are implemented in the SSC-Ni S/C electrode.The 3D SSC with an interwoven structure offers a large surface area and wide internal space for sulfur accommodation.Moreover,the powerful capability of physical immobilization/chemical anchoring of the polysulfides endowed by SSC and Ni S mitigates the shuttle effect.We compared electrodes with different current collectors,and the SSC-Ni S/C-1200 electrode material showed outstanding electrochemical performance,exhibiting a first specific capacity of 1268.36 m A h g-1at a high sulfur loading of 5.3 mg cm-2.Additionally,the SSC-Ni S/C-1200 electrode exhibited a good remaining capacity of 555.15 m A h g-1at a current density of0.5 A g-1with a high sulfur loading of 3.3 mg cm-2after 300 cycles.In addition,the active material loaded in the traditional way easily falls off when the conventional current collector is folded with increasing sulfur loading,but the flexible self-supporting carbon current collector can solve this problem.This study prepared a flexible free-standing 3D interconnected carbon current collector.Via the introduction of amorphous carbon-coated Ni S,the self-supporting cathode SSC-Ni S/C-1200 achieved high sulfur loading that results in excellent electrochemical performance,providing a reference for future research on high sulfur loading in lithium-sulfur batteries.

关 键 词：lithium-sulfur batteries current collector biomass-derived carbon high sulfur loading cycling stability 

分 类 号：TM912[电气工程—电力电子与电力传动]