Si/TiO_(2) carbon fiber core encapsulated in hierarchical multiple MXene@Co-MoS_(2) shells for constructing a free-standing anode of lithium storage  

作　　者：Xian-ping Du Ying Huang Jia-ming Wang Zhen-he Feng Xu Sun 

机构地区：[1]MOE Key Laboratory of Material Physics and Chemistry Under Extraordinary Conditions,School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi’an 710072,China [2]Shanghai Institute of Space Power-Sources,Shanghai 200245,China [3]Ningbo Institute of Northwestern Polytechnical University,Ningbo 315103,China

出　　处：《Rare Metals》2024年第9期4222-4233,共12页稀有金属（英文版）

基　　金：financially supported by Shanghai Aerospace Science and Technology Innovation Foundation (No. SAST2020-105)。

摘　　要：Silicon-based(Si-based) materials offer more possibilities for generating new portable electronic devices due to their high specific capacities. However, their inferior electrical conductivity and volume expansion during cycling seriously limit their development. The optimum solution is to select specific materials to establish an exceptionally conductive and volume buffer structure,which can assist Si materials in developing their excellent lithium storage properties. In this study, Si particles were confined in TiO_(2)carbon fibers(TiO_(2)CFs) via electrospinning, after which they were encapsulated with MXene and Co-MoS_(2)(CMS) nanosheets to fabricate hierarchical ST-2@MXene@CMS films. TiO_(2)CF, MXene and CMS were employed to establish a coherent conductive network with one-, two-and three-dimensional electronic pathways to permit the unimpeded flow of electrons inside the electrode material. TiO_(2)CF, MXene and CMS acted precisely as multilayered buffers to ameliorate the volume change of Si particles during cycling. In addition, the CMS nanosheets were involved in lithium storage, contributing to the final electrochemical performance. Ultimately, the ST-2@MXene@CMS films served as free-standing electrodes, avoiding the impact of inactive interfaces on the electrochemical performance and fulfilling the lightweight requirement for new energy storage devices.

关 键 词：Si particles MXene Co-MoS_(2)nanosheets Hierarchical structure Lithium-ion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ342.742[化学工程—化纤工业]