High Initial Reversible Capacity and Long Life of Ternary SnO2?Co?carbon Nanocomposite Anodes for Lithium?Ion Batteries

论文摘要

The two major limitations in the application of SnO2 for lithium?ion battery（LIB） anodes are the large volume variations of SnO2 during repeated lithiation/delithiation processes and a large irreversible capacity loss during the first cycle, which can lead to a rapid capacity fade and unsatisfactory initial Coulombic e ciency（ICE）. To overcome these limitations, we developed composites of ultrafine SnO2 nanoparticles and in situ formed Co（CoSn） nanocrystals embedded in an N?doped carbon matrix using a Co?based metal–organic framework（ZIF?67）. The formed Co additives and structural advantages of the carbon?confined SnO2/Co nanocomposite e ectively inhibited Sn coarsening in the lithiated SnO2 and mitigated its structural degradation while facilitating fast electronic transport and facile ionic di usion. As a result, the electrodes demonstrated high ICE （82.2%）, outstanding rate capability(～ 800 mAh g-1 at a high current density of 5 A g-1), and long?term cycling stability(～ 760 mAh g-1 after 400 cycles at a current density of 0.5 A g-1). This study will be helpful in developing high?performance Si（Sn）?based oxide, Sn/Sb?based sulfide, or selenide electrodes for LIBs. In addition, some metal organic frameworks similar to ZIF?67 can also be used as composite templates.

论文目录

• HIGHLIGHTS
• 1 Introduction
• 2 Experimental Section
•   2.1 Synthesis of Ultrafine SnO2
•   2.2 Synthesis of ZIF?67 Frameworks
•   2.3 Synthesis of N?c?SCC and N?u?SCC Composites
•   2.4 Material Characterization
•   2.5 Electrochemical Measurements
• 3 Results and Discussion
• 4 Conclusion

文章来源

类型: 期刊论文

作者: Pan Deng,Jing Yang,Shengyang Li,Tian?E Fan,Hong?Hui Wu,Yun Mou,Hui Huang,Qiaobao Zhang,Dong?Liang Peng,Baihua Qu

来源: Nano-Micro Letters 2019年01期

年度: 2019

分类: 工程科技Ⅰ辑,工程科技Ⅱ辑

专业: 材料科学,电力工业

单位: Pen?Tung Sah Institute of Micro?Nano Science and Technology, Department of Materials Science and Engineering, College of Materials, Xiamen University,College of Automation and Key Laboratory of Industrial Internet of Things and Networked Control,Ministry of Education, Chongqing University of Posts and Telecommunications,Department of Chemistry, University of Nebraska?Lincoln,School of Mechanical Science and Engineering, Huazhong University of Science and Technology

基金: supported by the National Key R&D Program of China (No. 2016YFA0202602),the National Natural Science Foundation of China (Grant Nos. 21503178 and 21703185),supported by XMU Undergradu? ate Innovation and Entrepreneurship Training Programs (Grants No. 2017X0695 for Huijiao Yang and Xiaocong Tang)

分类号: TB33;TM912

页码: 326-338

总页数: 13

文件大小: 1246K

下载量: 55