文献类型：期刊文献

英文题名：Two-dimensional porous carbon-coated sandwich-like mesoporous SnO2/graphene/mesoporous SnO2 nanosheets towards high-rate and long cycle life lithium-ion batteries

作者：Yao, Weiqi[1];Wu, Shengbo[1];Zhan, Liang[1,2];Wang, Yanli[1]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Key Lab Specially Funct Polymers & Related Techno, State Key Lab Chem Engn,Minist Educ, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Inst Coal Chem, CAS Key Lab Carbon Mat, Taiyuan 030001, Shanxi, Peoples R China

年份：2019

卷号：361

起止页码：329

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20185106276345);WOS:【SCI-EXPANDED(收录号:WOS:000457096400035)】；

基金：This work was financial supported by National Science Foundation of China (No. 51472086, 51572007, 51622203, 51002051, U1710252) and CAS Key Laboratory of Carbon Materials (KLCMKFJJ1703). We also gratitude Ms. Qingfei Zhao, who works in the analysis and testing center of Shanghai Normal University, she helps us the TEM characterization and analysis of nanomaterials.

语种：英文

外文关键词：Mesoporous tin oxide; Anode material; Two-dimensional; Nanosheets; Lithium-ion batteries

摘要：Two-dimensional (2D) carbon-coated sandwich-like mesoporous SnO2/graphene/mesoporous SnO2 nanosheets (C@SnO2-rGO-SnO2) is conceived and synthesized as a novel anode material towards advanced lithium-ion battery. The nanocrystals size of SnO2 could efficiently manipulate using sandwich-like mesoporous SiO2/graphene/ mesoporous SiO2 (SiO2-rGO-SiO2) nanosheets as template. The existence large quantity of mesoporous nanostructure not only could provide sufficient buffer space for alleviating volume change of SnO2 during the discharge/charge process, but also supply more surface reaction sites for facilitating the penetration of electrolyte into electrode and enhancing surface lithium storage capacity. The graphene acts as mini-current collector provides rapid Li+ diffusion and transportation, and the carbon-coated protection layer prevents SnO2 aggregation effectively, which contributes to form stable solid electrolyte interface (SEI) film during cycling. Furthermore, the synergistic effect of graphene and carbon-coated shell constitutes excellent conductive network, which overcomes low electrical conductivity shortage of SnO2. The C@SnO2-rGO-SnO2 electrode exhibits excellent reversibility (1211 mAh g(-1) after 300 cycles at 0.2 A g(-1)), good rate capability (545 mAh g(-1) at 5 A g(-1), 315 mAh g(-1) at 10 A g(-1)) and superior long-cycle stability (703 mAh g(-1) after 1200 cycles at 1 A g(-1), 525 mAh g(-1) after 1200 cycles at 2 A g(-1)).