COMPOSITE SOLID-ELECTROLYTE FOR LI BATTERY APPLICATIONS

The electrochemical, bulk and interfacial properties of the polyethyle ne oxide (PEG) based composite solid electrolyte (CSE) comprising LiI, PEG, and Al2O3 have been evaluated for Li battery applications. The b ulk interfacial and transport propel-ties of the CSEs seem to strongly depend on the alumina particle size. For the CSE films with 0.05 micr on alumina while the bulk conductivity is around 10(-4) (mho cm(-1)) a t 103 degrees C, the Li ion transport number seems to be close to unit y at the same temperature. Compared to the PEO electrolyte this polyme r composite electrolyte seems to exhibit robust mechanical and interfa cial properties. We have studied three different films with three diff erent alumina sizes in the range 0.01-0.3 micron. Effects of Al2O3 par ticle size on the electrochemical performance of polymer composite ele ctrolyte will be discussed. With TiS2 as cathode a 10 mAh small capaci ty cell was charged and discharged at C/40 and C/20 rates respectively .