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Lee, Kyu Tae
Electrochemical Energy Systems Laboratory
Research Interests
  • Electrode materials for Li-ion batteries
  • Na-ion & Mg-ion batteries
  • Li-Air & Li-Sulur batteries
  • Design of advanced materials with new crystal structures
  • Fundamental electrochemistry & solid state chemistry

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Wrapping SnO2 with porosity-tuned graphene as a strategy for high-rate performance in lithium battery anodes

Cited 5 times inthomson ciCited 3 times inthomson ci
Title
Wrapping SnO2 with porosity-tuned graphene as a strategy for high-rate performance in lithium battery anodes
Author
Nam, SeunghoonYang, Seung JaeLee, SangheonKim, JaewonKang, JoonhyeonOh, Jun YoungPark, Chong RaeMoon, TaehoLee, Kyu TaePark, Byungwoo
Issue Date
2015-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CARBON, v.85, pp.289 - 298
Abstract
The previous studies on SnO2 as electrode materials convey a message that the inevitable pulverization of SnO2 particles can be resolved by carbon-based materials. Since graphene has also proved effective for the harmful decrepitation of the particles with an advantage of electronic conductivity, wrapping SnO2 by sufficient amount of graphene seems to be an answer to enhancing its cycle life. On the other hand, severe wrapping of SnO2 by graphene is deleterious to its rate capability due to the sluggish motion of Li+ through the stacked graphene layers. Thus, in order to make graphene sheets favorable for Li-ion diffusion, they were modified to have large porosity with 3-D architectures, by a simple heating-rate control. The porous graphene-wrapped SnO2, having direct diffusion channels for Li+, outperforms the SnO2 with less-porous graphene. Consequently, the excellent performances are fulfilled, showing both stable cyclability (∼1100 mAh g-1 up to 100 cycles) and high rate capability (∼690 mAh g-1 under 3600 mA g-1). This strategy using porosity-tuned graphene sheet furnishes a valuable insight into the effective encapsulation of active materials, especially for those undergoing pulverization during cycling.
URI
https://scholarworks.unist.ac.kr/handle/201301/10623
URL
http://www.sciencedirect.com/science/article/pii/S0008622315000123
DOI
10.1016/j.carbon.2015.01.005
ISSN
0008-6223
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