All-solid-state lithium battery with a three-dimensionally ordered Li 1.5Al 0.5Ti 1.5(PO 4) 3 electrode

Abstract

To fabricate all-solid-state Li batteries using three-dimensionally ordered macroporous Li 1.5Al 0.5Ti 1.5(PO 4) 3 (3DOM LATP) electrodes, the compatibilities of two anode materials (Li 4Mn 5O 12 and Li 4Ti 5O 12) with a LATP solid electrolyte were tested. Pure Li 4Ti 5O 12 with high crystallinity was not obtained because of the formation of a TiO 2 impurity phase. Li 4Mn 5O 12 with high crystallinity was produced without an impurity phase, suggesting that Li 4Mn 5O 12 is a better anode material for the LATP system. A Li 4Mn 5O 12/3DOM LATP composite anode was fabricated by the colloidal crystal templating method and a sol–gel process. Reversible Li insertion into the fabricated Li 4Mn 5O 12/3DOM LATP anode was observed, and its discharge capacity was measured to be 27 mA h g −1. An all-solid-state battery composed of LiMn 2O 4/3DOM LATP cathode, Li 4Mn 5O 12/3DOM LATP anode, and a polymer electrolyte was fabricated and shown to operate successfully. It had a potential plateau that corresponds to the potential difference expected from the intrinsic redox potentials of LiMn 2O 4 and Li 4Mn 5O 12. The discharge capacity of the all-solid-state battery was 480 μA h cm −2.