Tin Nanoparticles Encapsulated Carbon Nanoboxes as High-Performance Anode for Lithium-Ion Batteries

Frontiers in Chemistry

Hong-Hui Wu¹  Ming-Sheng Wang²  Yong Cheng²  Pei Li²  Qiaobao Zhang²  Zhiming Zheng²  Ziming Yang² 

[1] Department of Chemistry, University of Nebraska-Lincoln, Lincoln, NE, United States;Department of Materials Science and Engineering, College of Materials and Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, China;

关键词: lithium-ion battery;    anode material;    yolk-shell structure;    Sn@C nanoboxes;    electrochemical performance;   

DOI  :  10.3389/fchem.2018.00533

来源: DOAJ

【 摘 要 】

One of the crucial challenges for applying Sn as an anode of lithium-ion batteries (LIBs) is the dramatic volume change during lithiation/delithiation process, which causes a rapid capacity fading and then deteriorated battery performance. To address this issue, herein, we report the design and fabrication of Sn encapsulated carbon nanoboxes (denoted as Sn@C) with yolk@shell architectures. In this design, the carbon shell can facilitate the good transport kinetics whereas the hollow space between Sn and carbon shell can accommodate the volume variation during repeated charge/discharge process. Accordingly, this composite electrode exhibits a high reversible capacity of 675 mAh g−1 at a current density of 0.8 A g−1 after 500 cycles and preserves as high as 366 mAh g−1 at a higher current density of 3 A g−1 even after 930 cycles. The enhanced electrochemical performance can be ascribed to the crystal size reduction of Sn cores and the formation of polymeric gel-like layer outside the electrode surface after long-term cycles, resulting in improved capacity and enhanced rate performance.

【 授权许可】

Unknown