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Sökning: onr:"swepub:oai:research.chalmers.se:549d02af-c140-44b7-9952-77d627d3bc90" > Designing a Safe El...

Designing a Safe Electrolyte Enabling Long‐Life Li/S Batteries

Agostini, Marco, 1987 (författare)
Chalmers University of Technology,Chalmers tekniska högskola
Sadd, Matthew, 1994 (författare)
Chalmers University of Technology,Chalmers tekniska högskola
Xiong, Shizhao, 1985 (författare)
Chalmers University of Technology,Chalmers tekniska högskola
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Cavallo, Carmen, 1986 (författare)
Chalmers University of Technology,Chalmers tekniska högskola
Heo, Jungwon (författare)
Gyeongsang National University, South Korea
Ahn, Jou Hyeon (författare)
Gyeongsang National University, South Korea
Matic, Aleksandar, 1968 (författare)
Chalmers University of Technology,Chalmers tekniska högskola
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 (creator_code:org_t)
2019
2019
Engelska.
Ingår i: ChemSusChem. - 1864-5631 .- 1864-564X. ; 12:18, s. 4176-4184
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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  • Lithium–sulfur (Li/S) batteries suffer from “shuttle” reactions in which soluble polysulfide species continuously migrate to and from the Li metal anode. As a consequence, the loss of active material and reactions at the surface of Li limit the practical applications of Li/S batteries. LiNO3 has been proposed as an electrolyte additive to reduce the shuttle reactions by aiding the formation of a stable solid electrolyte interphase (SEI) at the Li metal, limiting polysulfide shuttling. However, LiNO3 is continuously consumed during cycling, especially at low current rates. Therefore, the Li/S battery cycle life is limited by the LiNO3 concentration in the electrolyte. In this work, an ionic liquid (IL) [N-methyl-(n-butyl)pyrrolidinium bis(trifluoromethylsulfonyl)imide] was used as an additive to enable longer cycle life of Li/S batteries. By tuning the IL concentration, an enhanced stability of the SEI and lower flammability of the solutions were demonstrated, that is, higher safety of the battery. The Li/S cell built with a high sulfur mass loading (4 mg cm−2) and containing the IL-based electrolyte demonstrated a stable capacity of 600 mAh g−1 for more than double the number of cycles of a cell containing LiNO3 additive.

Ämnesord

NATURVETENSKAP  -- Kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Nyckelord

batteries
ionic liquids
lithium
electrolytes
sulfur

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