Fabrication of all-solid-state rechargeable lithium-ion battery using mille-feuille structure of Li_(0.3)5La_(0.55)TiO_3

摘要

A mille-feuille structure, which comprises both sides of dense layer are sandwiched by porous layers, is one of the promising structures for 3-dimensional (3D) all-solid-state battery. The porous layers should have 3-dimensionally ordered macroporous structure to obtain large contact area between electrolyte and electrode. Li_(0.35)La_(0.55)TiO_3 (LLT) solid electrolyte with the mille-feuille structure was fabricated by the suspension filtration method. The dense layer was sintered well, no grain boundary was observed. The porous layers contacted well with dense layer. Thicknesses of dense and porous layers were 30 and 26 靘, respectively. To check compatibility of the mille-feuille LLT with all-solid-state Li ion battery, chronopotentiometry of symmetric cell with LiMn_2O_4/mille-feuille LLT/LiMn_2O_4 configuration was measured. Charge and discharge currents were clearly observed, indicating that the cell was successfully operated.