Hydrogen storage material including a modified Ti-Mn2 alloy

Abstract

A modified Ti—Mn 2 hydrogen storage alloy. The alloy generally is comprised of Ti and Mn. A generic formula for the alloy is: Ti Q-X Zr X Mn Z-Y A Y , where A is generally one or more of V, Cr, Fe, Ni and Al. Most preferably A is one or more of V, Cr, and Fe. The subscript Q is preferably between 0.9 and 1.1, and most preferably Q is 1.0. The subscript X is between 0.0 and 0.35, more preferably X is between 0.1 and 0.2, and most preferably X is between 0.1 and 0.15. The subscript Y is preferably between 0.3 and 1.8, more preferably Y is between 0.6 and 1.2, and most preferably Y is between 0.6 and 1.0. The subscript Z is preferably between 1.8 and 2.1, and most preferably Z is between 1.8 and 2.0. The alloys are generally single phase materials, exhibiting a hexagonal C 14 Laves phase crystalline structure.

1 . A hydrogen storage material consisting essentially of: 
 a hydrogen storage alloy having the formula Ti U Zr V Mn W Cr X V Y A Z ,    wherein A is one or more elements selected from the group consisting of Fe, Ni, and Al;    0.75≦U≦0.95,    0.05≦V≦0.25,    0.6≦W≦1.31,    0.00≦X≦1.1,    0.03≦Y≦0.45,    0.26≦Z≦0.36,    U+V=1.0, and    1.95≦(W+X+Y+Z)/(U+V)≦2.05.    
     
     
         2 . The hydrogen storage material according to  claim 1 , wherein said hydrogen storage alloy is a single phase material.  
     
     
         3 . The hydrogen storage material according to  claim 2 , wherein said hydrogen storage alloy exhibits a hexagonal C 14  Laves phase crystalline structure.  
     
     
         4 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.9 Zr 0.1 Mn 1.3 V 0.45 Ni 0.26 .  
     
     
         5 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.8 Zr 0.2 Mn 1.25 V 0.4 Fe 0.36 .  
     
     
         6 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.8 Zr 0.2 Mn 1.3 V 0.45 Ni 0.26 .  
     
     
         7 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.95 Zr 0.05 Mn 1.3 V 0.45 Ni 0.26 .  
     
     
         8 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.84 Zr 0.15 Mn 1.28 V 0.25 Cr 0.18 Fe 0.25 Al 0.06 .  
     
     
         9 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.85 Zr 0.15 Mn 1.5 V 0.3 Fe 0.23 Al 0.06 .  
     
     
         10 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.87 Zr 0.13 Mn 1.29 V 0.17 Cr 0.18 Fe 0.24 Al 0.06 .  
     
     
         11 . The hydrogen storage material according to  claim 1 , wherein said alloy comprises Ti 0.87 Zr 0.13 Mn 1.23 V 0.16 Cr 0.17 Fe 0.23 Al 0.06 .  
     
     
         12 . The hydrogen storage material according to  claim 1 , wherein said hydrogen storage alloy is in powder form.  
     
     
         13 . The hydrogen storage material according to  claim 12 , wherein said hydrogen storage alloy powder is physically bonded to a support means.  
     
     
         14 . The hydrogen storage material according to  claim 13 , wherein hydrogen storage alloy powder is physically bonded to said support means by compaction and/or sintering.  
     
     
         15 . The hydrogen storage material according to  claim 13 , wherein said support means is selected from mesh, grid, matte, foil, foam or plate.  
     
     
         16 . The hydrogen storage material according to  claim 13 , wherein said support means is formed from one or more metals selected from Ni, Al, Cu, Fe and mixtures or alloys thereof.  
     
     
         17 . The hydrogen storage material according to  claim 13 , wherein said storage material comprises said hydrogen storage alloy powder physically bonded to said support means and spirally wound into a coil.