Nanopore design of sulfur doped hollow carbon nanospheres for superior potassium-ion battery anodes  

作　　者：Zhen-Dong Liu Hui-Yan Feng Yu-Chen Wang Fei Wang Yue Liu Jian-Xiao Yang Yue Gu Jun Tan Chong Ye Cheng-Zhi Zhang 

机构地区：[1]Ji Hua Laboratory,Foshan 528000,China [2]School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China [3]Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology,College of Materials Science and Engineering,Hunan University,Changsha 410082,China

出　　处：《Rare Metals》2024年第5期2103-2114,共12页稀有金属（英文版）

基　　金：supported by the Key R&D Plan of Jihua Laboratory(Nos.X200191TL200 and X220301XS220);Guangdong Basic and Applied Basic Research Foundation(No.2022A1515110052);Foshan Postdoctoral Science Foundation(Nos.X221071MS210);Numerical computations were performed on Hefei advanced computing center。

摘　　要：Sulfur doped carbonaceous materials are promising anodes for potassium-ion batteries because of their ability to bridge active sites and induce C/S electron coupling,resulting in increased ion storage capacitance However,the large potassium ions could cause significant volume expansion and structure collapse during operation in sulfur doped carbonaceous anodes,which lead to rapidly capacity sacrifice during long-term cycling.Nanopore design for anchoring sulfur atom in carbon skeleton is a novel way to alleviate the structure collapse and maintain the cycling stability.Therefore,this study developed a controlled nanopore and sulfur doped carbon sphere structure(S-NPHCSs).In potassium-ion batteries S-NPHCSs anode demonstrated exceptional performance with a high reversible capacity of 247 mAh·g^(–1)after 50 cycles at 0.2 A·g^(–1)and delivered a long cycle stability of 600 cycles at a high current density of 1.0 A·g^(–1).Interconnected nanopores and doped sulfur structure not only expand the accumulation space and offer ample active sites for diffusion and adsorption of potassium ions,but also build stable channels through nanopore structure to ensure the cyclic stability.This finding provides a fundamental theory for designing nanopore structures and introducing sulfur doped carbonaceous materials to enhance capacitive potassium storage and long cycle stability.

关 键 词：NANOPORE Carbon materials Sulfur doping Anode Potassium-ionbatteries 

分 类 号：TQ127.11[化学工程—无机化工] TB383.1[一般工业技术—材料科学与工程] TM912[电气工程—电力电子与电力传动]