Metal iodides (LiI, MgI2, AlI3, TiI4, and SnI4) potentiality as electrolyte additives for Li-S batteries
- Title
- Metal iodides (LiI, MgI2, AlI3, TiI4, and SnI4) potentiality as electrolyte additives for Li-S batteries
- Author
- 조국영
- Keywords
- Lithium−sulfur battery; Electrolyte; Additive; Metal iodide
- Issue Date
- 2021-09
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- ELECTROCHIMICA ACTA, v. 391, Page. 138927-138927
- Abstract
- Lithium−sulfur (Li−S) batteries are being evaluated as low-cost and high-capacity next-generation sec-
ondary batteries to improve the mileage in electric vehicles. Accordingly, cathodes and electrolytes for
Li−S batteries have been under active development in recent years. However, for the commercial use of
Li−S batteries, it is first necessary to address the low electrical conductivity of sulfur particles as well as
the low capacity retention caused by lithium polysulfide. We therefore investigated the effects of various
metal iodides as additives in the electrolyte used in Li−S batteries. Metal iodides (i.e., LiI, MgI2 , AlI3, TiI4,
and SnI4) added to ether-based electrolytes impacted the charge–discharge performance as well as physi-
cal properties such as Li ion conductivity and viscosity. The extent of their impact depended on their con-
centration. Electrolytes that included LiI or MgI2 additives in particular formed a stable solid electrolyte
interphase (SEI) layer on the Li metal and suppressed the polysulfide shuttle reaction. This is because the
viscosity of the electrolyte is appropriately increased by polymerization, and Mg ions along with Li ions
are deposited on the Li metal surface to form a stable SEI. Consequently, our approach demonstrates a
strategy for developing new electrolytes for Li−S batteries that takes advantage of the chemical reactivity
of the additives used in the electrolyte.
- URI
- https://www.sciencedirect.com/science/article/pii/S0013468621012172https://repository.hanyang.ac.kr/handle/20.500.11754/170443
- ISSN
- 0013-4686
- DOI
- 10.1016/j.electacta.2021.138927
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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