US2003203281A1PendingUtilityA1

Zinc powder or zinc alloy powder for alkaline batteries

33
Priority: Apr 25, 2002Filed: Jan 9, 2003Published: Oct 30, 2003
Est. expiryApr 25, 2022(expired)· nominal 20-yr term from priority
Inventors:Armin MelzerPetra MerkelJochen SpriestersbachRudi KubeNorbert Schulz
B22F 1/05B22F 1/00H01M 4/42Y02E60/10
33
PatentIndex Score
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Claims

Abstract

The invention is directed to a zinc powder or zinc alloy powder for alkaline batteries, which powder has a grain size distribution wherein 60 to 100 wt.-% of the particles, relative to the zinc powder or zinc alloy powder, have a diameter of from 40 to 140 μm. The invention is also directed to an alkaline battery.

Claims

exact text as granted — not AI-modified
1 . A zinc powder or zinc alloy powder for alkaline batteries, which powder has a grain size distribution wherein 60 to 100 wt.-% of the particles, relative to the zinc powder or zinc alloy powder, have a diameter of from 40 to 140 μm.  
     
     
         2 . The zinc powder or zinc alloy powder according to  claim 1 , characterized in that the powder has a grain size distribution wherein 75 to 95 wt.-% of the particles have a diameter of from 40 to 140 μm.  
     
     
         3 . The zinc powder or zinc alloy powder according to  claim 1  or  2 , characterized in that the bulk density is in a range of from 2.9 to 4.5 g/cm 3 .  
     
     
         4 . The zinc powder or zinc alloy powder according to  claim 3 , characterized in that the bulk density is in a range of from 3.2 to 4.0 g/cm 3 .  
     
     
         5 . The zinc powder or zinc alloy powder according to one or more of  claims 1  to  4 , characterized in that the amount of particles having a diameter of <40 μm is less than 10 wt.-%, relative to the zinc powder or zinc alloy powder.  
     
     
         6 . The zinc powder or zinc alloy powder according to  claim 5 , characterized in that the amount of particles having a diameter of <40 μm is less than 5 wt.-%, relative to the zinc powder or zinc alloy powder.  
     
     
         7 . The zinc powder or zinc alloy powder according to one or more of  claims 1  to  6 , characterized in that those particles having a diameter of up to 100 μm, preferably <71 μm, have a spherical particle shape.  
     
     
         8 . The zinc powder or zinc alloy powder according to one or more of  claims 1  to  7 , characterized in that metals selected from the group of indium, bismuth, lead, aluminum, calcium, lithium, sodium, magnesium, or mixtures thereof are included as alloy elements.  
     
     
         9 . The zinc powder or zinc alloy powder according to  claim 8 , characterized in that one or more alloy elements selected from the following group of metals can be included in the following amounts: 0.1 to 1200 ppm indium, 0.1 to 1000 ppm bismuth, 0.1 to 1000 ppm lead, 0.1 to 200 ppm aluminum, 0.1 to 200 ppm calcium, 0.1 to 200 ppm lithium, 0.1 to 200 ppm sodium, 0.1 to 200 ppm magnesium.  
     
     
         10 . The zinc powder or zinc alloy powder according to  claim 8 , characterized in that the powder includes 0.1 to 1200 ppm indium and 0.1 to 1000 ppm bismuth.  
     
     
         11 . The zinc powder or zinc alloy powder according to  claim 8 , characterized in that the powder includes 0.1 to 1200 ppm indium, 0.1 to 1000 ppm bismuth, and 0.1 to 1000 ppm lead.  
     
     
         12 . The zinc powder or zinc alloy powder according to  claim 8 , characterized in that the powder includes 0.1 to 1000 ppm lead and 0.1 to 1000 ppm indium.  
     
     
         13 . The zinc powder or zinc alloy powder according to  claim 8 , characterized in that the powder includes 0.1 to 1000 ppm lead.  
     
     
         14 . The zinc powder or zinc alloy powder according to  claim 8 , characterized in that the powder includes 0.1 to 1000 ppm indium, 0.1 to 1000 ppm bismuth, and 0.1 to 200 ppm aluminum.  
     
     
         15 . The zinc powder or zinc alloy powder according to one or more of  claims 10  to  14 , characterized in that the powder additionally includes 0.1 to 200 ppm lithium and/or 0.1 to 200 ppm sodium.  
     
     
         16 . The zinc powder or zinc alloy powder according to one or more of  claims 1  to  15 , characterized in that the zinc powder is an amalgamated zinc powder.  
     
     
         17 . The zinc powder or zinc alloy powder according to  claim 16 , characterized at the zinc powder is amalgamated with 0.1 to 7 wt.-% Hg.  
     
     
         18 . The zinc powder or zinc alloy powder according to one or more of claims  1   7 , characterized in that the ≧5 wt.-% zinc powder is used in combination with conventional zinc powders or zinc alloy powders of the prior art.  
     
     
         19 . An alkaline battery, including as anode the zinc powder according to  claims 1  to  18 .

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