LITHIUM ION CONDUCTIVE SOLID ELECTROLYTES WITH POROUS DENSE BI-LAYER STRUCTURE FOR ALL SOLID STATE BATTERY

摘要

Fabrication of all-solid-state Li battery with inflammable ceramics electrolyte has been strongly required to overcome safety issue of present Li battery. One of promising structures for ceramics electrolyte in all-solid-state battery is bi-layered structure composed of 3 dimensionally ordered macroporous (3DOM) layer and dense layer. In this study, we prepared Li_(0.35)La_(0.55)TiO_3 (LLT) ceramics electrolyte with the bi-layered structure by suspension filtration method. Thicknesses of the dense and the porous layers were about 23 and 105 um. respectively. The porous layer involved uniform pores of 1.8 um in diameter. An electrochemical property of LiMn_O_4 bi-layered LLT composite prepared by solvent substitution method was tested. A discharge and charge behavior of the composite electrode was clearly observed. From this result, it can be said that the composite electrode can be applied to rechargeable battery. The discharge capacity of the composite was 27 mA h g~(-1).