Carbon polyhedra encapsulated Si derived from Co-Mo bimetal MOFs as anode materials for lithium-ion batteries  

作　　者：Huan Ruan Lifeng Zhang Shuai Li Kai Wang Wenhuan Huang Shouwu Guo 

机构地区：[1]School of Materials Science and Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China [2]College of Chemistry and Chemical Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China [3]School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Journal of Materials Science & Technology》2023年第28期91-98,共8页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(NSFC,No.21203116);the Innovation Capability Support Plan of Shaanxi Province(Grant No.2022WGZJ-25);the Foundation of Shaanxi University of Science and Tech-nology(Grant No.210210031 and 210210032).

摘　　要：Silicon(Si)holds promise as an anode material for lithium-ion batteries(LIBs)as it is widely avail-able and characterized by high specific capacity and suitable working potential.However,the relatively low electrical conductivity of Si and the significantly high extent of volume expansion realized dur-ing lithiation hinder its practical application.We prepared N-doped carbon polyhedral micro cage en-capsulated Si nanoparticles derived from Co-Mo bimetal metal-organic framework(MOFs)(denoted as Si/CoMo@NCP)and explored their lithium storage performance as anode materials to address these prob-lems.The Si/CoMo@NCP anode exhibited a high reversible lithium storage capacity(1013 mAh g^(−1)at 0.5 A g^(−1)after 100 cycles),stable cycle performance(745 mAh g^(−1)at 1 A g^(−1)after 400 cycles),and excellent rate performance(723 mAh g^(−1)at 2 A g^(−1)).Also,the constructed the full-cell NCM 811//Si/CoMo@NCP exhibited well reversible capacity.The excellent electrochemical performances of Si/CoMo@NCP were at-tributed to two unique properties.The encapsulation of NCP with doped nitrogen and porous structural carbon improves the electrical conductivity and cycling stability of the molecules.The introductions of metallic cobalt and its oxides help to improve the rate capability and lithiation capacity of the materials following multi-electron reaction mechanisms.

关 键 词：Si anode Carbon polyhedra Cobalt/molybdenum double doping Lithium-ion batteries Electrochemical property 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]