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.

We claim:  
     
         1 . A hydrogen storage material comprising: 
 a hydrogen storage alloy having the formula Ti Q−X Zr X Mn Z−Y A Y ,    wherein A is one or more elements selected from the group consisting of V, Cr, Fe, Ni, and Al;    Q is between 0.9 and 1.1    X is between 0 and 0.35,    Y is between 0.3 and 1.8, and    Z is between 1.8 and 2.1.    
     
     
         2 . The hydrogen storage material of  claim 1 , wherein A one or more elements selected from the group consisting of V, Cr, Fe, and Ni.  
     
     
         3 . The hydrogen storage material of  claim 1 , wherein X is between 0.1 and 0.2.  
     
     
         4 . The hydrogen storage material of  claim 1 , wherein X is between 0.1 and 0.15.  
     
     
         5 . The hydrogen storage material of  claim 1 , wherein Y is between 0.6 and 1.2  
     
     
         6 . The hydrogen storage material of  claim 1 , wherein Y is between 0.7 and 1.0.  
     
     
         7 . The hydrogen storage material of  claim 1 , wherein said hydrogen storage alloy is a single phase material.  
     
     
         8 . The hydrogen storage material of  claim 7 , wherein said hydrogen storage alloy exhibits a hexagonal C 14  Laves phase crystalline structure.  
     
     
         9 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.9 Zr 0 1 Mn 1 3 V 0.45 Ni 0.26 .  
     
     
         10 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.8 Zr 0.2 Mn 1.25 V 0 4 Cr 0.3 Fe 0.06 .  
     
     
         11 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.8 Zr 0.2 Mn 1.25 V 0 4 Fe 0.36 .  
     
     
         12 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.7 Zr 0.3 Mn 1 5 V 0.3 Ni 0.17 .  
     
     
         13 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.8 Zr 0.2 Mn 1 3 V 0.45 Ni 0 26 .  
     
     
         14 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.95 Zr 0.05 Mn 1 3 V 0 45 Ni 0 26 .  
     
     
         15 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.9 Zr 0.1 Mn 1 28 V 0 3 Cr 0.25 Ni 0.17 .  
     
     
         16 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.8 Zr 0 2 Mn 1 31 V 0 25 Cr 0 3 Ni 0 14 .  
     
     
         17 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.9 Zr 0 1 Mn 0.6 V 0 2 Cr 1 08 Ni 0 12 .  
     
     
         18 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.8 Zr 0.2 Mn 1 31 V 0.25 Cr 0 30 Fe 0.14 .  
     
     
         19 . The hydrogen storage material of  claim 1 , wherein said all Ti 0.84 Zr 0.15 Mn 1 28 V 0 25 Cr 0.18 Fe 0 25 Al 0.06 .  
     
     
         20 . The hydrogen storage material of  claim 1 , wherein said alloy comprises Ti 0.85 Zr 0 15 Mn 1 5 V 0.3 Fe 0 23 Al 0 06 .  
     
     
         21 . The hydrogen storage material of  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 .  
     
     
         22 . The hydrogen storage material of  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 .  
     
     
         23 . The hydrogen storage material of  claim 1 , wherein said hydrogen storage alloy is in powder form.  
     
     
         24 . The hydrogen storage material of  claim 23 , wherein said hydrogen storage alloy powder is physically bonded to a support means.  
     
     
         25 . The hydrogen storage material of  claim 24 , wherein hydrogen storage alloy powder is physically bonded to said support means by compaction and/or sintering.  
     
     
         26 . The hydrogen storage material of  claim 24 , wherein said support means comprises at least one selected from the group consisting of mesh, grid, matte, foil, foam and plate.  
     
     
         27 . The hydrogen storage material of  claim 24 , wherein said support means is formed from a metal.  
     
     
         28 . The hydrogen storage material of  claim 27 , wherein said support means is formed from one or more metals selected from the group consisting of Ni, Al, Cu, Fe and mixtures or alloys thereof.  
     
     
         29 . The hydrogen storage material of  claim 24 , wherein said storage material comprises said hydrogen storage alloy powder physically bonded to said support means and spirally wound into a coil.  
     
     
         30 . The hydrogen storage material of  claim 24 , wherein said storage material comprises said hydrogen storage alloy powder physically bonded to said support means, a plurality of which are stacked as disks or plates.