Journal
JOURNAL OF POWER SOURCES
Volume 306, Issue -, Pages 617-622Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.12.093
Keywords
Battery; Sulfur; Activation; Micropore; Hierarchical porous structure
Funding
- basic science research program of the National Research Foundation of Korea [2014R1A1A2057204]
- [IBS-R006-G1]
- National Research Foundation of Korea [2014R1A1A2057204] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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