@article{25318,
  keywords = {ionic conductivity, plasticizer, polyacrylate ethers, single ion conductor},
  author = {Xiao-Guang Sun and Jun Hou and John B Kerr},
  title = {Comb-shaped single ion conductors based on polyacrylate ethers and lithium alkyl sulfonate},
  abstract = {<p>Comb-shaped single ion conductors have been synthesized by (1) sulfonation of small molecule chloroethyleneglycols, which, after ion exchange to the Li<sup>+</sup> salt were then converted to the acrylate by reaction with acryloyl chloride and copolymerized with polyethylene glycol monomethyl ether acrylate (Mn = 454, <em>n</em> = 8) (PAE<sub>8</sub>-co-E<sub>3</sub>SO<sub>3</sub>Li); (2) sulfonation of chloride end groups grafted on to prepolymers of polyacrylate ethers (PAE<sub>8</sub>-g-E <em><sub>n</sub></em>SO<sub>3</sub>Li, <em>n</em> = 2, 3). The highest conductivity at 25°C of 2.0 × 10<sup>−7</sup>Scm<sup>−1</sup> was obtained for the PAE<sub>8</sub>-co-E<sub>3</sub>SO<sub>3</sub>Li with a salt concentration of EO/Li = 40. The conductivity of PAE<sub>8</sub>-g-E<sub>3</sub>SO<sub>3</sub>Li is lower than that of PAE<sub>8</sub>-co-E<sub>3</sub>SO<sub>3</sub>Li at similar salt concentrations, which is related to the incomplete sulfonation of the grafted polymer that leads to a lower concentration of Li<sup>+</sup>. The addition of 50wt.% of plasticizer, PC/EMC (1/1, v/v), to PAE<sub>8</sub>-g-E<sub>2</sub>SO<sub>3</sub>Li increases the ambient conductivity by three orders of magnitude, which is due to the increased ion mobility in a micro-liquid environment and an increase concentration of free ions as a result of the higher dielectric constant of the solvent. A symmetrical Li/Li cell with an electrolyte membrane consisting of 75wt.% PC/EMC (1/1, v/v) was cycled at a current density of 100μAcm<sup>−2</sup> at 85°C. The cycling profile showed no concentration polarization after a break-in period during the first few cycles, which was apparently due to reaction of the solvent at the lithium metal surface that reacted with lithium metal to form a stable SEI layer.</p>},
  year = {2005},
  journal = {Electrochimica Acta},
  volume = {50},
  pages = {1139-1147},
  month = {01/2005},
  issn = {0013-4686},
  doi = {10.1016/j.electacta.2004.08.011},
  language = {eng},
}