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Hierarchical and lamellar porous carbon as interconnected sulfur host and polysulfide-proof interlayer for Li–S batteries

查看全文 作　　者：Peifan [1]Wang;Xin [1]Dai;Peng [2]Xu;Sijiang [3]Hu;Xuyang [4]Xiong;Kunyang [1]Zou;Shengwu [1]Guo;Junjie [1]Sun;Chaofeng [4]Zhang;Yongning [1]Liu;Tengfei [4]Zhou;Yuanzhen [1]Chen 高影响力作者 机构地区：[1]The State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,PR China;[2]Technical Monitoring Center,Petro China Changqing Oil Field Company,Xi'an,710018,PR China;[3]Guangxi Key Laboratory of Low Carbon Energy Material,Guangxi Normal University,Guilin,541004,China;[4]Institutes of Physical Science and Information Technology,Anhui University,Hefei,230601,PR China高影响力机构 出　　处：《eScience》索引2023年第3卷第1期,共10页高影响力期刊 基　　金：The authors gratefully acknowledge the financial support by the Joint Funds of the Natural Science Basic Research Project of Shaanxi Province(2021JLM-23);University Joint Project of Shaanxi Province(2021GXLH-Z-067);Anhui Provincial Natural Science Foundation for Outstanding Young Scholar(2208085Y05);Anhui Provincial Scientific Reuter Foundation for Returned Scholars(2022LCX030);the National Natural Science Foundation of China(51801144);Guangxi Key Labo-ratory of Low Carbon Energy Material(2021GXKLLCEM04)。 摘　　要：A robust three-dimensional(3D)interconnected sulfur host and a polysulfide-proof interlayer are key components in high-performance Li–S batteries.Herein,cellulose-based 3D hierarchical porous carbon(HPC)and two-dimensional(2D)lamellar porous carbon(LPC)are employed as the sulfur host and polysulfide-proof inter-layer,respectively,for a Li–S battery.The 3D HPC displays a cross-linked macroporous structure,which allows high sulfur loading and restriction capability and provides unobstructed electrolyte diffusion channels.With a stackable carbon sheet of 2D LPC that has a large plane view size and is ultrathin and porous,the LPC-coated separator effectively inhibits polysulfides.An optimized combination of the HPC and LPC yields an electrode structure that effectively protects the lithium anode against corrosion by polysulfides,giving the cell a high ca-pacity of 1339.4 mAh g^(-1) and high stability,with a capacity decay rate of 0.021% per cycle at 0.2C.This work provides a new understanding of biomaterials and offers a novel strategy to improve the performance of Li–S batteries for practical applications. 关 键 词：Lithium-sulfur batteries Hierarchical porous carbon Lamellar porous carbon Interconnected sulfur host Polysulfide-proof interlayer
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