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Additives Engineered Nonflammable Electrolyte for Safer Potassium Ion Batteries

Title
Additives Engineered Nonflammable Electrolyte for Safer Potassium Ion Batteries
Author
황장연
Keywords
additives; nonflammable electrolytes; potassium ion batteries; solid electrolyte interfaces; solvation structures
Issue Date
2020-10
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v. 30, no. 43, article no. 2001934
Abstract
Potassium ion batteries (KIBs) are attracting great attention as an alternative to lithium-ion batteries due to lower cost and better global sustainability of potassium. However, designing electrolytes compatible with the graphite anode and addressing the safety issue of highly active potassium remains challenging. Herein, a new concept of using additives to engineer non-flammable electrolytes for safer KIBs is introduced. It is discovered that the additives, such as the ethylene sulfate (i.e., DTD), can make the electrolyte of 1.0 m potassium bis(fluorosulfonyl) imide in trimethyl phosphate compatible with graphite anode for the first time, without the need of concentrated electrolyte strategies. A new coordination mechanism of additives in the electrolyte is presented. It is shown that the additive can change the K+ solvation structure and then determine the interfacial behaviors of K+-solvent on electrode interface, which are critical to affect the graphite performance (i.e., K+-solvent co-insertion, or K+ (de-)intercalation). Then, an extremely high potassium storage capability is obtained in graphite electrode for potassium (ion) batteries, particularly the presented high-performance graphite|K0.69CrO2 full battery fully demonstrates the practical application of this newly designed electrolyte. This additive-based strategy can offer more opportunities to tune the electrolyte properties and then serve for the more mobile ion battery system.
URI
https://onlinelibrary.wiley.com/doi/10.1002/adfm.202001934https://repository.hanyang.ac.kr/handle/20.500.11754/171835
ISSN
1616-301X; 1616-3028
DOI
10.1002/adfm.202001934
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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