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Intrinsic shuttle suppression in lithium-sulfur batteries for pouch cell application

: Weller, Christine; Thieme, Sören; Härtel, Paul; Althues, Holger; Kaskel, Stefan


Journal of the Electrochemical Society 164 (2017), Nr.14, S.A3766-A3771
ISSN: 0013-4651
ISSN: 1945-7111
ISSN: 0096-4786
Fraunhofer IWS ()
lithium sulfur; shuttle suppression; electrolyte

A new lithium-sulfur secondary battery concept is presented, realistically portrayed on pouch cell level, with its decisive element being a new electrolyte system, a mixture of a hydrofluoro ether and sulfolane. The hereby suppressed polysulfide solubility enables high discharge capacities and requires only very low electrolyte excess (< 2.6 µl mgS-1) achieving high coulomb efficiencies above 94 % (capacity retention of 77 % over 40 cycles) without the necessity of adding lithium nitrate for shuttle suppression. Due to the low volatility, this new electrolyte concept promises significant benefits for large operational battery units.