119 0

An Advanced Separator for Li-O-2 Batteries: Maximizing the Effect of Redox Mediators

Title
An Advanced Separator for Li-O-2 Batteries: Maximizing the Effect of Redox Mediators
Author
선양국
Keywords
5,10-dihydro-5,10-dimethylphenazine; lithium oxygen batteries; poly(3,4-ethylenedioxythiophene) polystyrene sulfonate; redox mediators; separators
Issue Date
2017-05
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED ENERGY MATERIALS, v. 7, no. 18, Article no. 1602417
Abstract
Although Li-O-2 batteries are promising next-generation energy storage systems with superior theoretical capacities, they have a serious limitation regarding the large overpotential upon charging that results from the low conductivity of the discharge product. Thus, various redox mediators (RMs) have been widely studied to reduce the overpotential in the charging process, which should promote the oxidation of Li2O2. However, RMs degrade the Li metal anode through a parasitic reaction between the RM and the Li metal, and a solution for this phenomenon is necessary. In this study, an effective method is proposed to prevent the migration of the RM toward the anode side of the lithium using a separator that is modified with a negatively charged polymer. When DMPZ (5,10-dihydro-5,10-dimethylphenazine) is used as an RM, it is found that the modified separator suppresses the migration of DMPZ toward the counter electrode of the Li metal anode. This is investigated by a visual redox couple diffusion test, a morphological investigation, and an X-ray diffraction study. This advanced separator effectively maximizes the catalytic activity of the redox mediator. Li-O-2 batteries using both a highly concentrated DMPZ and the modified separator exhibit improved performance and maintained 90% round-trip efficiency up to the 20th cycle.
URI
https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201602417https://repository.hanyang.ac.kr/handle/20.500.11754/114049
ISSN
1614-6832; 1614-6840
DOI
10.1002/aenm.201602417
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE