文献类型：期刊文献

英文题名：In-situ construction of g-C3N4/carbon heterostructure on graphene nanosheet: An efficient polysulfide barrier for advanced lithium-sulfur batteries

作者：Zhang, Huijie[1];Liu, Qizhi[1];Ruan, Songju[1];Ma, Cheng[1,2];Jia, Xianfeng[1,3];Qiao, Wenming[1,2];Ling, Licheng[1,2];Wang, Jitong[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China;[3]Tangshan Normal Univ, Dept Chem, Tangshan 063000, Peoples R China

年份：2021

卷号：578

外文期刊名：APPLIED SURFACE SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000730808600003)】；

基金：This work was partly supported by the National Natural Science Foundation of China (No. 22178116, 21978097) , Shanghai Pujiang Program (21PJD019) and the Fundamental Research Funds for the Central Universities (222201817001, 50321041918013, 50321042017001) .

语种：英文

外文关键词：Lithium-sulfur battery; Functional interlayer; Graphitic carbon nitride; Graphene; Heterostructure

摘要：Lithium-sulfur batteries (LSBs) have been considered as the future potential energy storage system with advantages of high energy density (2600 Wh kg-1), eco-friendliness and low cost. However, the poor conductivity and serious shuttle effects of polysulfides block their application. Herein, g-C3N4/carbon heterostructure on graphene nanosheet (PCNG) is constructed via phenyl-modified strategy and in-situ thermal polycondensation, which has a unique electron cloud distribution with excellent sulfur immobilization ability as well as good electroconductivity. As a result, Li-S cells with simple S/C cathodes and PCNG interlayers show a high initial capacity of 1192 mAh g-1 at 0.1C, and an ultra-long lifespan with a slow capacity attenuation of 0.050% per cycle after 800 cycles. The cell with PCNG/PP separator also has a stable cycle performance at high area sulfur loading of 7 mg cm-2. These findings provide a new sight on functionalizing g-C3N4 for application in Li-S electrochemistry.