Multilevel carbon architecture of subnanoscopic silicon for fast‐charging high‐energy‐density lithium‐ion batteries

作     者：Meisheng Han Yongbiao Mu Lei Wei Lin Zeng Tianshou Zhao 

作者机构：Shenzhen Key Laboratory of Advanced Energy StorageSouthern University of Science and TechnologyShenzhenChina SUSTech Energy Institute for Carbon NeutralitySouthern University of Science and TechnologyShenzhenChina Department of Mechanical and Energy EngineeringSouthern University of Science and TechnologyShenzhenChina 

出 版 物：《Carbon Energy》 (碳能源（英文）)

年 卷 期：2024年第6卷第4期

页      面：256-268页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Guangdong Basic and Applied Basic Research Foundation,Grant/Award Number:2020A1515110762 Research Grants Council of the Hong Kong Special Administrative Region,China,Grant/Award Number:R6005‐20 Shenzhen Key Laboratory of Advanced Energy Storage,Grant/Award Number:ZDSYS20220401141000001 

主　　题：fast charging high energy densities lithium‐ion batteries multilevel carbon architecture subnanoscopic silicon anode 

摘      要：Silicon(Si)is widely used as a lithium‐ion‐battery anode owing to its high capacity and abundant crustal ***,large volume change upon cycling and poor conductivity of Si cause rapid capacity decay and poor fast‐charging capability limiting its commercial ***,we propose a multilevel carbon architecture with vertical graphene sheets(VGSs)grown on surfaces of subnanoscopically and homogeneously dispersed Si–C composite nanospheres,which are subsequently embedded into a carbon matrix(C/VGSs@Si–C).Subnanoscopic C in the Si–C nanospheres,VGSs,and carbon matrix form a three‐dimensional conductive and robust network,which significantly improves the conductivity and suppresses the volume expansion of Si,thereby boosting charge transport and improving electrode *** VGSs with vast exposed edges considerably increase the contact area with the carbon matrix and supply directional transport channels through the entire material,which boosts charge *** carbon matrix encapsulates VGSs@Si–C to decrease the specific surface area and increase tap density,thus yielding high first Coulombic efficiency and electrode compaction ***,C/VGSs@Si–C delivers excellent Li‐ion storage performances under industrial electrode *** particular,the full cells show high energy densities of 603.5 Wh kg^(−1)and 1685.5 Wh L^(−1)at 0.1 C and maintain 80.7%of the energy density at 3 C.