标题
作者
作者:Hu, RZ (Hu, Renzong)[1,2 ]; Ouyang, YP (Ouyang, Yunpeng)[1 ]; Chen, DC (Chen, Dongchang)[2 ]; Wang, H (Wang, Hui)[1 ]; Chen, Y (Chen, Yu)[2 ]; Zhu, M (Zhu, Min)[1 ]; Liu, ML (Liu, Meilin)[2 ]
期刊信息
摘要
The large capacity loss and low initial Coulombic efficiency (ICE) of a conventional SnO2-based anode for Li ion batteries are originated largely from the limited reversibility of the conversion reaction associated with the anode. Often, the reversibility of the lithiation/delithiation of SnO2 (with a high ICE value of similar to 82%) declines with Sn coarsening in the Sn/Li2O mixture during cycling, leading to gradual capacity decay. Here we demonstrate that the application of super-elastic films of NiTi alloy could accommodate the internal stress and volume change of lithiated nano-SnO2 layer in a tri-layer NiTi/SnO2/NiTi sandwich anode, effectively suppressing Sn coarsening. This unique electrode configuration has helped to retain the high reversibility of the SnO2 layer with reversible capacity more than 800 mAh/g (based on SnO2) for over 300 cycles, demonstrating stable charge capacities of similar to 400 mAh/g in the potential ranges of 0.01 -1.0 V and 1.0-2.0 V(vs. Li/Li+), respectively. Insitu spectroscopic and exsitu diffraction analyses corroborate the highly reversible electrochemical cycling, confirming that the reversibility and cyclability of SnO2 anodes can be dramatically enhanced by preserving the nanostructure of Sn/Li2O mixture, which facilitates the reversible conversion reaction. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词
作者关键词:Tin dioxide; Conversion reaction; Sn coarsening; Super-elasticity; NiTi alloys
作者信息
通讯作者地址:Zhu, M (通讯作者)
![]() | S China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Guangdong, Peoples R China. |
![]() | Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA. |
地址:
出版商
类别分类
研究方向:Materials Science; Metallurgy & Metallurgical Engineering
Web of Science 类别:Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering