Activation of micropore-confined sulfur within hierarchical porous carbon for lithium-sulfur batteries

Title
Activation of micropore-confined sulfur within hierarchical porous carbon for lithium-sulfur batteries
Author
유원철
Keywords
Battery; Sulfur; Activation; Micropore; Hierarchical porous structure; HIGH-RATE PERFORMANCE; ION BATTERIES; CYCLING STABILITY; CATHODE MATERIALS; STORAGE; SPHERES; ELECTROLYTE; COMPOSITES; CAPACITY; DESIGN
Issue Date
2016-02
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 306, Page. 617-622
Abstract
Hierarchical porous carbon is often used in Li-S batteries due to the widely perceived benefits regarding the wide range of pore sizes. However, such notions are based solely on demonstrations of improved cyclic performances, and specific evidence to prove the utilization of the pores is yet to be found. Herein, we report, for the first time, the evidence for gradual activation of micropore-confined sulfur within porous carbon structures. By systematic comparison of rnicroporous and hierarchical porous structures, we show that at sufficiently low current, sulfur infused hierarchical porous structures display a slowly activated and reversible reaction at 1.75 V vs Li/Li+ during discharge. This is in addition to the conventionally reported two voltage plateau at 2.3 and 2.1 V. Furthermore, the effects of LiNO3 decomposition on the system and the electrochemical mechanism behind the activation process is elucidated. Overall, the findings supplement the currently known electrochemical mechanisms occurring within porous structures and pave the way for more efficient utilization of hierarchical porous structures for applications in Li-S batteries. (C) 2015 Elsevier B.V. All rights reserved.
URI
https://www.sciencedirect.com/science/article/pii/S0378775315307059http://hdl.handle.net/20.500.11754/49527
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2015.12.093
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > CHEMICAL AND MOLECULAR ENGINEERING(화학분자공학과) > Articles
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