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] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Key Laboratory of Specially Functional Polymeric Materials and Related Technology, East China University of Science and Technology, Shanghai, 200237, China; [3] Department of Chemistry, Tangshan Normal University, Tangshan, 063000, China

年份：2022

卷号：578

外文期刊名：Applied Surface Science

收录：EI(收录号：20215011321412)

语种：英文

外文关键词：Lithium batteries - Polysulfides - Potential energy - Lithium sulfur batteries - Carbon nitride - Lithium compounds - Nanosheets

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. ? 2021 Elsevier B.V.