Single-ion electrolytes are battery electrolytes with anions immobilized in an electrochemical charge/discharge process. Such electrolytes reduce the ionic gradient concentration near anode and thus hold promise in preventing dendrite growth. Here a single-block single-ion polymer electrolyte, poly(LiTFSI attached poly(ethylene glycol) methyl ether methacrylate) (poly(PEGMA-TFSI-Li+)), was prepared by combining photo-induced metal free atom transfer radical polymerization (ATRP) and click chemistry. The covalent attachment of ion pairs onto a conductive backbone made the lithium ions highly delocalized. The brush-like backbones further reduced the polymer crystallinity. Therefore, the polymers showed high ionic conductivity (&gt; 10-4 S/cm at 90 <sup>o</sup>C) and high transference number (&gt; 0.97). The dependence of ionic conductivity on degree of polymerization was studied by synthesizing well-defined brush-like polymers with degree of polymerization of 7, 14 and 30. The exchanged current density was calculated in terms of ionic conductivity and transference number using Monroe and Newman model.<br/>

Single-ion polymer brush electrolytes for lithium metal batteries

254th National Meeting (2017)

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