Studies on the Solid Polyelectrolytes for Rechargeable Film-type Lithium Batteries.

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"Aluminate"solid polyelectrolytes carrying lithium tetra (alkoxy) aluminate complex units or "Thioaluminate"types carrying tetra (alklthio) aluminate complex units were newly developed. These solid polyelectrolytes gave single ionic conductivity on the contrary to the bi-ionic nature of hybrid polyelectrolytes as high as 10^<-6> and 10^<-5>S/cm, respectively. Both polyelectrolytes are thermally stable up to 250ﾟC,and easily disposable becausse of non-toxicity.Among the examination of rechargeable batteries with metakkic lithium anodes, the best results were obtained when TiS_2 or oxidized state polyaniline were used as cathodes. Especially when the extra lithium salts were added to the polyelectrolyte in suitable amount in order to realize the ideal bi-ionic conduction, t_+=t_-=0.5, high capacity of about 20 mAh/g was established without the significant decay of discharging plateau potential. While the aluminate polymer complex polyelectrolytes were stable in contact with metal oxide cathode materials, the corresponding thioaluminate types decomposed due to contaminating moisture. Only sulfide or selenide calcogen materials were available as cathode materials in the case of thioaluminates.During the course to search for non-flameable and safe electrode mataerials, we found anormalous dda graphite (AG) fine powders with strong acceptor properties which will be used in stead of ordinary calcogenides. This AG material may open the possibility to prepare high performance all carbon cells such as [Graphite-Li (anode) /electrolyte/AG]. At the same time, as AG can be used as a cathode material in combination with the highly conductive but unstable thioaluminate polyelectrolytes, it may provide the rechargeable batteries with higher capacity and current density.