US2008085209A1PendingUtilityA1

Hydrogen-absorbing alloy for an alkaline storage battery

Assignee: ACCUMULATEURS FIXESPriority: Feb 28, 2006Filed: Feb 27, 2007Published: Apr 10, 2008

Est. expiryFeb 28, 2026(expired)· nominal 20-yr term from priority

Inventors:Patrick Bernard Bernard Knosp Michel Latroche Amelie Ferey

Y02E60/10C22C 19/07H01M 4/242C01B 3/0057H01M 4/383H01M 4/26Y02E60/32C22C 19/03

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References

Claims

Abstract

Therefore the invention provides a hydrogen-absorbing alloy comprising at least one A 5 B 19 type crystalline phase having the formula R 1−y Mg y Ni 3.8±0.1−z M z , in which R represents one or more elements chosen from La, Ce, Nd or Pr; M represents one or more elements chosen from Mn, Fe, Al, Co, Cu, Zr, Sn and M does not contain Cr; 0≦y≦0.30; z≦0.5. The invention extends to an electrode comprising an active ingredient comprising said alloy. It also extends to a nickel metal hydride alkaline storage battery the negative electrode of which comprises said alloy. The invention also relates to the process for the manufacture of said alloy.

Claims

exact text as granted — not AI-modified

1 . Hydrogen-absorbing alloy comprising at least one crystalline phase of type A 5 B 19  having the formula R 1−y Mg y Ni 3.8±0.1−z M z , in which: 
 R represents one or more elements chosen from    La, Ce, Nd or Pr;    M represents one or more elements chosen from    Mn, Fe, Al, Co, Cu, Zr, Sn and M does not contain Cr;    0≦y≦0.30;    z≦0.5.    
     
     
         2 . Alloy according to  claim 1 , in which the sum of the stoichiometric indices of nickel and M is 3.8.  
     
     
         3 . Alloy according to  claim 1 , in which y≦0.25.  
     
     
         4 . Alloy according to  claim 1 , in which y&gt;0.15.  
     
     
         5 . Alloy according to  claim 1 , in which z≦0.30.  
     
     
         6 . Alloy according to  claim 1 , in which the stoichiometric index of each of the nickel substituents is less than or equal to 0.20.  
     
     
         7 . Alloy according to  claim 6 , in which the stoichiometric index of each of the nickel substituents is less than or equal to 0.15.  
     
     
         8 . Alloy according to  claim 1 , in which M represents one or more elements chosen from Co, Al and Mn.  
     
     
         9 . Alloy according to  claim 1 , in which M is Co a Al b , with a≦0.15 and b≦0.15.  
     
     
         10 . Alloy comprising a crystalline phase A 5 B 19  as defined in  claim 1 , and the overall composition of which has the formula:  
         R 1−u Mg u Ni t−v M v  where  0≦u≦0.25;    3.5≦t≦4.3;    v≦0.5.    
     
     
         11 . Alloy according to  claim 10  in which the crystalline phase A b B 19  represents at least 50% by volume of the alloy.  
     
     
         12 . Alloy according to  claim 1 , in which the equilibrium pressure at 40° C., for 1% by mass of hydrogen inserted, is less than 1.5 bar.  
     
     
         13 . Alloy according to  claim 1 , in which the size of the particles is characterized by a Dv 50% of 30 to 120 μm, preferably of 50 to 100 μm.  
     
     
         14 . Alloy according to  claim 1 , in which the size of the particles is characterized by a Dv 50% of 120 to 200 μm.  
     
     
         15 . Electrode comprising an active ingredient comprising the alloy according to  claim 1 .  
     
     
         16 . Electrode according to  claim 15  also comprising an yttrium-based compound.  
     
     
         17 . Electrode according to  claim 16 , in which the yttrium compound is an oxide such as Y 2 O 3 , an hydroxide such as Y(OH) 3  or an yttrium salt.  
     
     
         18 . Electrode according to  claim 17 , in which the mass of yttrium represents from 0.1 to 2% of the mass of the alloy, preferably from 0.2 to 1% of the mass of the alloy, also preferably from 0.2 to 0.7% of the mass of the alloy.  
     
     
         19 . Nickel metal hydride alkaline storage battery comprising with at least one negative electrode according to  claim 15 .  
     
     
         20 . Process for the manufacture of an alloy according to  claim 1  comprising the stages of: 
 melting the single elements of the alloy    quenching or hyperquenching.    
     
     
         21 . Process for the manufacture of an alloy according to  claim 1  comprising the stage of: 
 sintering from the single elements of the alloy or    sintering from prealloys.    
     
     
         22 . Process for the manufacture of an alloy according to  claim 1  comprising a stage of mechanosynthesis.  
     
     
         23 . Process according to  claim 20  for the manufacture of an alloy comprising an annealing stage.

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