Synthesis and Property of AAEE as Cross-link Type New Cathode Active Material for Lithium Battery

Acrylic acid 2-(2-acryloyloxy-ethyldisulfanyl)-ethyl ester (AAEE) was synthesized and cross-linked to the corresponding polymer as a new cathode material of lithium secondary battery. The electrochemical properties of two types of electrode using the polymerized AAEE were investigated. One of the cells was made of the AAEE electrode containing gel-type electrolyte according to the conventional method, and the electrode was simply made by binding AAEE and carbon black. This cell showed high discharge capacity about 380 mAh/g. The other cell was made of the AAEE composite type electrode containing solid polymer electrolyte. The newly devised electrode was made by the stepwise procedure, after the disulfide was first absorbed to carbon black surface, then PEO was added and polymerized prior to make the cell. This electrode was composite type and this cell showed excellent cycling performance. Even after more than 2000 charge-discharge cycles, no decrease of the performance was observed.