Authors: Jinkai Wang Sanmu Xie Daxian Cao Xuan Lu Lingjie Meng Guidong Yang Hongkang Wang
Publish Date: 2016/09/19
Volume: 18, Issue: 9, Pages: 280-
Abstract
We demonstrate a facile synthesis of ultrafine SnO2 nanoparticles within graphene nanosheets GNSs via thermal decomposition of tinoctoate in which tinoctoate is firstly blended with GNSs followed by annealing in air at a low temperature 350 °C and a short time 1 h As anode for lithium ion batteries the SnO2/GNSs displays superior cycle and rate performance delivering reversible capacities of 803 and 682 mA h/g at current densities of 200 and 500 mA/g after 120 cycles respectively much higher than that of pure SnO2 and GNSs counterparts 143 and 310 mA h/g at 500 mA/g after 120 cycles respectively The enhanced electrochemical performance is attributed to the ultrafine SnO2 nanoparticle size and introduction of GNSs GNSs prevent the aggregation of the ultrafine SnO2 nanoparticles which alleviate the stress and also provide more electrochemically active sites for lithium insertion and extraction Moreover GNSs with large specific surface area ~363 m2/g act as a good electrical conductor which greatly improves the electrode conductivity and also an excellent buffer matrix to tolerate the severe volume changes originated from the LiSn alloyingdealloying This work provides a straightforward synthetic approach for the design of novel composite anode materials with superior electrochemical performanceThis work was supported by the National Science Foundation of China Grant No 51402232 and 51521065 the Fundamental Research Funds for the Central Universities in China the Natural Science Basis Research Plan in Shaanxi Province of China Grant No 2015JQ5131 and the Open Fund of the State Key Laboratory of Luminescent Materials and Devices South China University of Technology Grant No 2016skllmd04 The authors also thank Ms Yazhu Dai and Mr Chuansheng Ma for their help with SEM/TEM measurements carried out at International Center for Dielectric Research ICDR Xi’an Jiaotong University Xi’an China
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