Solid polymer electrolyte comprised of lithium salt/ether functionalized ammonium-based polymeric ionic liquid with bis(fluorosulfonyl)imide

摘要

Newsolid polymer electrolytes (SPEs) comprised of lithium bis(fluorosulfonyl) imide (Li[N(SO2F)(2)], LiFSI) and polymeric ionic liquid (i.e.,poly[N, N-dimethyl-N-[2-(methacryloyloxy) ethyl]-N-[2-(2-methoxyethoxy) ethyl] ammonium] bis(fluorosulfonyl) imide, P[C5O2NMA, 11] FSI) have been prepared and characterized. For comparison, the corresponding SPEs, lithium bis(trifluoromethylsulfonyl) imide (Li [N(SO2CF3)(2)], LiTFSI)/poly[N, N-dimethyl-N-[2-(methacryloyloxy) ethyl]-N-[2-(2-methoxyethoxy) ethyl] ammonium] bis(trifluoromethylsulfonyl) imide (P[C5O2NMA, 11] TFSI), are also prepared and characterized. Their physicochemical properties have been investigated in terms of phase transition behavior, ionic conductivity, lithium-ion transference number (t(Li)(+)), electrochemical stability, and with particular attention to the interfacial behavior between lithium electrode and SPEs. It has been demonstrated that the ionic conductivities of LiFSI/P[C(5)O(2)NMA, 11] FSI electrolyte are higher than those of the corresponding TFSI-based one. The interface resistances of Li symmetric cell (Li metal vertical bar polymer electrolytes vertical bar Li metal) using LiFSI/P[C5O2NMA, 11] FSI electrolyte are much lower than those using LiTFSI/P[C5O2NMA, 11] TFSI electrolyte. These outstanding properties of the FSI-based electrolyte make it attractive as SPEs for Li battery. (C) 2015 Elsevier Ltd. All rights reserved.