文献类型：期刊文献

中文题名：Confining ultrahigh oxygen vacancy SnO_(2) nanocrystals into nitrogen-doped carbon for enhanced Li-ion storage kinetics and reversibility

作者：Ying Liu[1];Chen Hu[1];Ling Chen[2];Yanjie Hu[1];Hao Jiang[1];Chunzhong Li[1,2]

机构：[1]Key Laboratory for Ultrafine Materials of Ministry of Education,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;[2]Shanghai Engineering Research Center of Hierarchical Nanomaterials,Frontiers Science Center for Materiobiology and Dynamic Chemistry,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China

年份：2022

卷号：31

期号：6

起止页码：450

中文期刊名：Journal of Energy Chemistry

外文期刊名：能源化学（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2021_2022】；

基金：supported by the National Natural Science Foundation of China (21975074, 91834301 and 51621002);the Innovation Program of Shanghai Municipal Education Commission;the Fundamental Research Funds for the Central Universities (222201718002)。

语种：英文

中文关键词：Li-ion batteries;SnO_(2);Oxygen vacancy;Confined synthesis;Rate capability

摘要：Oxygen vacancies (V_(o)) engineering has been deemed to an effective tactic for enhancing Li-ion storage kinetics and reversibility of SnO_(2)-based anode materials.Herein,we demonstrated the confinement of ultrahigh V_(o)SnO_(2) nanocrystals into N-doped carbon frameworks to boost their high-rate and cycle life.Density functional theory (DFT) calculations reveal that abundant V_(o) in SnO_(2) facilitates the adsorption to Li-ion with remarkably increased carrier concentration.The 6.0 nm-sized SnO_(2) particles and the embedded design effectively stabilize the structural integrity during de-/lithiation.Meantime,the as-formed large hetero-interface also expedites the electron transfer.These merits guarantee its high-rate performance and superior cycling stability.Consequently,this sample exhibits a high capacity of 1368.9m Ah g^(-1)at 0.1 A g^(-1),and can still maintain 488.5 mAh g^(-1)at 10 A g^(-1)and a long life over 400 cycles at 5 A g^(-1)with 96.6%capacity retention,which is among the best report for Sn-contained anode materials.This work sheds light on ultrahigh Vo and structural design in conversion-type oxides for highperformance lithium-ion batteries (LIBs).