Polystyrene-Al(2)O(3 )composite solid polymer electrolyte for lithium secondary battery

In a common salt-in-polymer electrolyte, a polymer which has polar groups in the molecular chain is necessary because the polar groups dissolve lithium salt and coordinate cations. Based on the above point of view, polystyrene [PS] that has nonpolar groups is not suitable for the polymer matrix. However, in this PS-based composite polymer-in-salt system, the transport of cations is not by segmental motion but by ion-hopping through a lithium percolation path made of high content lithium salt. Moreover, Al(2)O(3 )can dissolve salt, instead of polar groups of polymer matrix, by the Lewis acid-base interactions between the surface group of Al(2)O(3 )and salt. Notably, the maximum enhancement of ionic conductivity is found in acidic Al(2)O(3 )compared with neutral and basic Al(2)O(3 )arising from the increase of free ion fraction by dissociation of salt. It was revealed that PS-Al(2)O(3 )composite solid polymer electrolyte containing 70 wt.% salt and 10 wt.% acidic Al(2)O(3 )showed the highest ionic conductivity of 9.78 × 10(-5 )Scm(-1 )at room temperature.