Abstract
Single ion conducting polymer electrolytes (SIPEs) comprised of homopolymers containing a polysulfonylamide segment in the polymer backbone are presented.
Highlights
Weight ratios of lithiated polymer and PVdF-HFP of 1 : 1,19,27,29 2 : 3,28 3 : 2 and 2 : 1,27 respectively, were utilized for membrane fabrication in previous studies of similar non- uorinated polysulfonamide containing homopolymers, though none of the studies included an optimization of the blend composition
Sufficient mechanical stability has to be maintained for the fabrication of membranes that are applicable in Li ion batteries, so that a minimum amount of PVdF-HFP should be present
A new homopolymer is successfully prepared for application as a single ion conducting polymer electrolyte in lithium ion or lithium metal batteries
Summary
Lithium metal constitutes an attractive anode material for lithium ion batteries due to its high speci c capacity and low electrochemical potential, thereby in principle facilitating batteries with high energy density.[1,2] Currently, the application of lithium metal in batteries is restricted due to safety issues associated with dendrite growth and rather instable solid electrolyte interphase (SEI) formation.[3,4,5,6,7] An approach to overcome this challenge comprises polymer electrolytes, which due to their bene cial mechanical properties can reduce dendrite growth.[8,9,10] Single ion conducting polymers are a promising class of materials, which in contrast to typically applied dual ion conducting liquid electrolytes[11,12] afford high transference numbers and signi cantly reduced polarization effects, since merely lithium ions are mobile while the charge-balancing anions are covalently attached to the polymer backbone.[13,14,15] Based on theoretical work, an immobilization of anions allows for reduced dendrite formation considering that the dendrite initiation time (so-called Sand's time) s is reversely proportional to the anion transference number ta,[16,17,18] which in the case of single ion conducting polymer electrolytes tends to converge to zero provided that the lithium ion transference number tLi+ approaches one.For a successful implementation of single lithium ion conducting polymer electrolytes, various concepts were proposed. Different anionic anchor groups carrying Li ions may be Single ion conducting polymer electrolytes may be “dry” or gel-type polymers that are plasticized with a salt-free organic solvent or an ionic liquid (IL). In “dry” polymer electrolytes, the anionic groups should be attached to polymer side chains to enable sufficient ionic transport, e.g. via inter-chain hopping, whereas for a gel-type polymer electrolyte anions either can be located at side chains or at the polymer backbone, since the ion transport is likely dominated by the present solvent or IL.[33,34,35] The prominent advantages of gel-type polymer electrolytes comprise superior ionic conductivity and lower electrolyte– electrode interfacial resistances compared to rather “dry” materials, despite the fact that substantial progress was achieved for “dry” polymer electrolytes in recent years.[8,13,36,37,38,39] Notably, sufficient polymer exibility results either from incorporation of rather exible, linear polymer compounds into single ion conducting polymer structures or from blending of aromatic single ion conducting polymers (that tend to be brittle when fabricated as a self-standing membrane) with another polymer having a linear structure.[34] Previous reports revealed the bene cial characteristics of single ion conducting gel-type polymer electrolytes derived from aromatic polysulfonamide-based homopolymers composed of 188 | J.
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