TY  - JOUR
AU  - Grünebaum, Mariano
AU  - Buchheit, Annika
AU  - Krause, Daniel
AU  - Hiller, Martin Manuel
AU  - Schmidt, Christina
AU  - Winter, Martin
AU  - Wiemhöfer, Hans-Dieter
TI  - Development of new pyrazole-based lithium salts for battery applications – Do established basic design concepts really work?
JO  - Electrochimica acta
VL  - 286
SN  - 0013-4686
CY  - New York, NY [u.a.]
PB  - Elsevier
M1  - FZJ-2018-06764
SP  - 313 - 323
PY  - 2018
AB  - This work is focused on applying structural concepts and basic chemical principles to model two N-heterocyclic lithium salts, based on trifluoromethyl substituted pyrazolide anions. An easily upscalable preparation method without difficult purification steps was also developed. In a comparative study, the physicochemical properties of the two new lithium salts were investigated, particularly the effect of an additional BF3-group at the nitrogen atom. In comparison to non-substituted lithium pyrazolide, the BF3-addition led to a strong improvement of thermal and electrochemical stability, ionic conductivity, as well as better C-rate and cycling performance. Furthermore, the anodic stability of Al current collectors was investigated and compared to commercial lithium salts, namely LiPF6 and lithium bis((trifluoromethyl)sulfonyl)imide (LiTFSI). Possible mechanisms that lead to the presented improvements are discussed.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000445133700036
DO  - DOI:10.1016/j.electacta.2018.08.055
UR  - https://juser.fz-juelich.de/record/857797
ER  -