Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6601989 | Electrochimica Acta | 2018 | 26 Pages |
Abstract
Ultrafine SnO2 particles are encapsulated in the hollow nanochannels of ordered mesoporous carbon (OMC) framework by simple infiltration of tin precursor and heat treatment. The SnO2@OMC anode delivers excellent cyclic stability with a reversible specific capacity of â¼1000â¯mAh gâ1 after 100 cycles at 100â¯mAâ¯gâ1 for Li-ion batteries (LIBs). It also presents an excellent rate performance with a specific capacity of 680â¯mAâ¯gâ1 at a high current density of 500â¯mAâ¯gâ1. Several functional features and ameliorating geometries play positive roles in Li-storage performance and stability of the electrode. They include (i) the intimate electrical contacts between the SnO2 nanoparticles and the walls of OMC channels to facilitate fast ion/electron transfer, (ii) the large surface area originating from the unique architecture of the composite, and (iii) the encapsulation of SnO2 particles within the channels to suppress their volume expansion during charge/discharge cycles. The reversibility of the conversion reaction is also supported by the high Li-ion diffusion coefficient with enhanced electrochemical reaction kinetics. Based on the above findings, this work may offer new insights into the rational nanostructural design of electrode materials for high performance rechargeable batteries.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Sara Abouali, Mohammad Akbari Garakani, Jang-Kyo Kim,