Designing High-Performant Lithium Battery Electrolytes by Utilizing Two Natures of Li+ Coordination: LiTDI/LiTFSI in Tetraglyme
Artikel i vetenskaplig tidskrift, 2020

Highly concentrated electrolytes (HCEs) based on glymes, such as tetraglyme (G4), are currently the focus of much battery research, primarily due to their unique properties - especially with respect to ion transport and electrochemical stability. While the LiTFSI-G4 and LiTDI-G4 systems both have been studied extensively, we here design their hybrid electrolytes to answer; will the resulting properties be averages/superpositions or will there be synergies created? We find the latter to be true and demonstrate that the most performant electrolytes are obtained by introducing a minor amount of LiTDI to an LiTFSI based electrolyte, which promotes the disproportionation and formation of "free" cations and at the same to avoid large aggregates - shown comprehensively both experimentally and by different modelling approaches and analyses combined. This electrolyte composition strategy can be generalized to other salts and solvents and thus a route towards a flora of novel battery electrolytes is here suggested.

Modelling

Lithium

Concentrated electrolytes

Conductivity

Bi-salt system

Författare

Piotr Jankowski

Chalmers, Fysik, Materialfysik

Rasmus Andersson

Chalmers, Fysik, Materialfysik

Patrik Johansson

Chalmers, Fysik, Materialfysik

BATTERIES & SUPERCAPS

2566-6223 (eISSN)

Vol. In Press

Ämneskategorier

Materialkemi

Annan kemiteknik

Annan kemi

DOI

10.1002/batt.202000189

Mer information

Senast uppdaterat

2020-11-10