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Ti_(3)C_(2)T_(x)MXene wrapped,carbon-coated porous Si sheets for improved lithium storage performance

查看全文 作　　者：Hui [1]Cheng;Yueming [2]Liu;Zhongling [1]Cheng;Xianying [3]Wang;Na [1]Huang;Haijiao [1]Zhang 高影响力作者 机构地区：[1]Institute of Nanochemistry and Nanobiology,School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China;[2]Shanghai Key Laboratory of Green Chemistry and Chemical Processes,School of Chemistry and Molecular Engineering,East China Normal University,Shanghai 200062,China;[3]Energy Materials Research Center AG Hydrogen Materials & Devices,CAS Key Laboratory of Materials for Energy Conversion,Shanghai Institute of Ceramics,Chinese Academy of Sciences (SICCAS),Shanghai 200050,China高影响力机构 出　　处：《Chinese Chemical Letters》索引2024年第35卷第2期,共5页高影响力期刊 基　　金：financially supported by the Natural Science Foundation of Shanghai(No.23ZR1423800);Shuguang Program from Shanghai Education Development Foundation and Shanghai Municipal Education Commission(No.18SG35);Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education),Nankai University. 摘　　要：Si-based materials have shown great potential as lithium-ion batteries(LIBs)anodes due to their natural reserves and high theoretical capacity.However,the large volume changes during cycles and poor conductivity of Si lead to rapid capacity decay and poor cycling stability,ultimately limiting their commercial applications.Herein,we have skillfully utilized the microporous MCM-22 zeolite as the unique silicon source to produce porous Si(pSi)sheets by a simple magnesiothermic reduction,followed by a carbon coating and further Ti_(3)C_(2)T_(x)MXene assembly,obtaining the ternary pSi@NC@TNSs composite.In the design,porous Si sheets provide more active sites and shorten Li-ion transport paths for electrochemical reactions.The N-doped carbon(NC)layer serves as a bonding layer to couple pSi and Ti_(3)C_(2)T_(x).The conductive network formed by 2D Ti_(3)C_(2)T_(x)and medium NC layer effectively enhances the overall charge transport of the electrode material,and helps to stabilize the electrode structure.Therefore,the as-made pSi@NC@TNSs anode delivers an improved lithium storage performance,exhibiting a high reversible capacity of 925 mAh/g at 0.5 A/g after 100 cycles.This present strategy provides an effective way towards high-performance Si-based anodes for LIBs. 关 键 词：Si anodes Ti_(3)C_(2)Ti_(x)MXene Porous structure Interfacial assembly Lithium-ion batteries
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