Fabrication of Electrode With 3 Dimensionally Ordered Structure for All-Solid-State Battery
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Fabrication of Electrode with 3 Dimensionally Ordered Structure for All-Solid-State Battery Masashi Kotobuki and Kiyoshi Kanamura Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa Hachioji, Tokyo, 192-0397, Japan ABSTRACT Fabrication of all-solid-state Li battery 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 2-layered structure composed of 3 dimensionally ordered macroporous layer (3DOM) and dense layer. In this study, we prepared LLT ceramics electrolyte with the 2-layered structure by suspension filtration method. Thicknesses of the dense and the porous layers were about 17 and 111 µm, respectively. The porous layer involved uniform pores of 1.8 µm in diameter. An electrochemical property of LiMn2O4 / 2-layered LLT composite, prepared by impregnation of precursor sol for LiMn2O4 into the pores followed by calcination, was tested. A rechargeable behavior of the composite electrode was clearly observed. From this result, it can be said that the composite can work as rechargeable battery. The discharge capacity of the composite was 27 mA h g-1. INTRODUCTION Lithium-ion battery system is one of the most attractive energy sources for mobile devices. However, a safety issue is still remaining as problem for commercially available lithium-ion batteries1, due to usage of electrolytes including flammable organic solvents. The allsolid-state rechargeable lithium battery with solid electrolyte has been recognized as one of alternative technologies of new generation of lithium ion batteries. Particularly, ceramic electrolytes have been paid much attention because of their high durability against high temperature operation. However, one of the problems for all solid-state lithium-ion battery using ceramic electrolyte is high internal resistance because of a poor contact between solid electrolyte and active material2. We have proposed a novel electrode system using ceramic electrolyte with three-dimensionally ordered macroporous (3DOM) structure having a large surface area3. By injection of active material into the 3DOM pore, large contact area of active material / ceramics electrolyte can be created. In our group, preparation of ceramics electrolyte with 3DOM structure and development of an efficient method to inject the active material into the 3DOM pore have been studied3-5. Li0.35La0.55TiO3 (LLT) and Li1.5Al0.5Ti1.5(PO4)3 (LATP) ceramics electrolytes with 3DOM structure have been prepared by the suspension filtration method and colloid crystal template method, respectively4,5. Additionally, new injection procedure of active material into the 3DOM pores so-called “solvent substitution method“5 has been developed. In fact, LiMn2O4 / 3DOM LLT electrode prepared by the solvent substitution method showed relatively high discharge capacity, 83 mA h g-1 that is 56 % of theoretical capacity. By the way, a new family of Li conduct
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