Solid-state rechargeable battery

Abstract

A solid-state rechargeable battery includes a pair of electrode layers and a solid electrolyte layer interposed between the pair of electrode layers. The pair of electrode layers each include a phosphate having an olivine crystal structure. The phosphate contains a transition metal and lithium.

We claim: 
     
         1 . A solid-state rechargeable battery comprising:
 a pair of electrode layers each including a phosphate containing a transition metal and lithium, and having an olivine crystal structure; and   a solid electrolyte layer interposed between the pair of electrode layers.   
     
     
         2 . The solid-state rechargeable battery according to  claim 1 ,
 wherein the phosphate included in each of the pair of electrode layers contains the same transition metal.   
     
     
         3 . The solid-state rechargeable battery according to  claim 2 ,
 wherein the transition metal comprises at least one element selected from Co, Mn, Fe, and Ni.   
     
     
         4 . The solid-state rechargeable battery according to  claim 2 ,
 wherein the solid electrolyte layer contains a transition metal the same as that contained in the phosphates included in the electrode layers.   
     
     
         5 . The solid-state rechargeable battery according to  claim 1 ,
 wherein one of the electrode layers further comprises a NASICON structure.   
     
     
         6 . A method for producing a solid-state rechargeable battery, the method comprising:
 preparing a first precursor of a first electrode layer;   forming a print layer composed of a conducting metal paste on one surface of the first precursor;   forming a second precursor of a second electrode layer on another surface of the print layer opposite to that formed on the one surface of the first precursor;   forming a multilayer structure including the first and second precursors of the first and second electrode layers and the print layer interposed therebetween;   preparing a plurality of the multilayer structures and stacking on top of one another;   forming third precursors of solid electrolyte layers interposed between each pair of the multilayer structures;   press-bonding the stacked precursors; and   firing the stacked precursors.