Oxygen vacancies(Vo)engineering has been deemed to an effective tactic for enhancing Li-ion storage kinetics and reversibility of SnO2-based anode materials.Herein,we demonstrated the confinement of ultrahigh Vo SnO2 nanocrystals into N-doped carbon frameworks to boost their high-rate and cycle life.Density functional theory(DFT)calculations reveal that abundant Vo in SnO2 facilitates the adsorption to Li-ion with remarkably increased carrier concentration.The 6.0 nm-sized SnO2 particles and the embed-ded 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 perfor-mance and superior cycling stability.Consequently,this sample exhibits a high capacity of 1368.9 mAh 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 mate-rials.This work sheds light on ultrahigh Vo and structural design in conversion-type oxides for high-performance lithium-ion batteries(LIBs).

Ying Liu;Chen Hu;Ling Chen;Yanjie Hu;Hao Jiang;Chunzhong Li

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;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

能源化学

[1]Ying Liu;Chen Hu;Ling Chen;Yanjie Hu;Hao Jiang;Chunzhong Li-.Confining ultrahigh oxygen vacancy SnO2 nanocrystals into nitrogen-doped carbon for enhanced Li-ion storage kinetics and reversibility)[J].能源化学,2022(06):450-455

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