Compared with ordinary graphite anode,SnO2 possesses higher theoretical specific capacity,rich raw materials and low price.While the severe volume expansion of SnO2 during lithium-ion extraction/intercalation limits its further application.To solve this problem,in this work the reduced graphene oxide(rGO)was introduced as volume buffer matrix of SnO2.Herein,SnO2/rGO composite is obtained through one-step hydrothermal method.Three-dimensional structure of rGO could effectively hinder the polymerization of SnO2 nanoparticles and provide more lithium storage sites attributed to high specific surface area and density defects.The initial discharge capacity of the composite cath-ode is 959 mA-h-g-1 and the capacity remained at 300 mA-h-g-1 after 1000 cycles at 1 C.It proved that the rGO added in the anode has a capacity contribution to the lithium-ion battery.It changes the capacity contribution mechanism from diffusion process dominance to surface driven capacitive contribution.Due to the addition of rGO,the anode material gains stable structure and great conductivity.

Qi Li;Guoju Zhang;Yuanduo Qu;Zihan Zheng;Junkai Wang;Ming Zhu;Lianfeng Duan

Department of Chemistry and Key Laboratory for Preparation and Appli-cation of Ordered Structural Materials of Guangdong Province,Shantou University,Shantou 515063,China;Advanced Institute of Materials Science&Department of Materials Science and Engineering,Changchun University of Technology,Changchun 130012,China;SEU-FEI Nano-Pico Center,Key Laboratory of MEMS of Ministry of Education,Southeast University,Nan-jing 211189,China

中国机械工程学报

[1]Qi Li;Guoju Zhang;Yuanduo Qu;Zihan Zheng;Junkai Wang;Ming Zhu;Lianfeng Duan-.Capacity Contribution Mechanism of rGO for SnO2/rGO Composite as Anode of Lithium-ion Batteries)[J].中国机械工程学报,2022(04):72-79

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