Synthesis of tin-indium/graphene nanosheet composite as anode materials for high performance lithium ion batteries
A new ternary composite based on tin-indium alloy (Sn-In) and graphene nanosheet (GNS) was prepared via a facile solvothermal synthesis followed by thermal treatment in hydrogen and argon at 550 ℃.Characterizations show that the tin-indium nanoparticles with about 100 nm in size were wrapped between the graphene nanosheets.As an anode for lithium ion batteries, the Sn-In/GNS composite exhibits a remarkably improved electrochemical performance in terms of lithium storage capacity (865.6 mAh g-1 at 100 mA g-1 rate), initial coulombic efficiency (78.6%), cycling stability (83.9%capacity retention after 50 cycles), and rate capability (493.2 mAh g-1 at 600 mA g-1 rate after 25 cycles) compared to Sn/GNS and Sn-In electrode.This improvement is attributed to the introduction of lithium activity metal, indium, which reduces the charge transfer resistance of electrode, and the graphene nanosheet which accommodates the volume change of tin-indium nanoparticles during cycling and improves electrical conductivity of material.
Tin-indium alloy Graphene nanosheet Anode Lithium ion batteries
HongxunYang
School of Environmental & Chemical Engineering, Jiangsu University of Science and Technology,Zhenjiang 212003, China
国内会议
宁波
英文
778-792
2014-11-11（万方平台首次上网日期，不代表论文的发表时间）