Microporous PVdF gel for lithium-ion batteries

A novel ionic conductor for lithium-ion batteries was developed. This electrolyte is based on a porous polymer matrix filled and swollen by a Liquid. The polymer matrix obtained by phase inversion was characterized in terms of porosity and average pore size. The microporous PVdF gel formed by impregnation of this polymer matrix with liquid electrolyte exhibited a high equivalent conductivity and a good temperature stability. Complete lithium-ion batteries using this polymer-based electrolyte were manufactured with a new process. Preliminary cycling results show a good rate capability and a capacity evolution similar to that of regular lithium-ion cells. The interest of this technology, as many other lithium-polymer ones, also lies in the possibility of designing and manufacturing new battery shapes at lower cost. (C) 1999 Elsevier Science S.A. All rights reserved.