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Full text of "USPTO Patents Application 09868995"

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Patent claims 

1 . Nickel mixeci hydroxide with Ni as the main element and with a layer 
structure, comprising 

a) at least onfe element M a from the group comprising Fe, Cr, Co, Ti, Zr 
5 and Cu which is present in two different oxidation states which differ 

by one electron in terms of the number of outer electrons; 

b) at least one element M b from the group comprising B, Al, Ga, In and 
RE (rare earth mWls, preferably Sc, Y or La) present in the trivalent 
oxidation state; 

10 c) optionally at least one element M c from the group comprising Mg, 

Ca, Sr, Ba and Zn present in the divalent oxidation state; 

d) apart from the hydro^de^atkast one additional anion from the group 
comprising halides (preferably^ fluoride or chloride), carbonate, 
sulfate, acetate, oxalate, borate anoNphosphate in a quantity sufficient 

15 to preserve the electro\eutrality of the mixed hydroxide; and 

e) water of hydration in a quafjttiy^which stabilises the relevant structure 
of the mixed hydroxide. 

2. Nickel mixed hydroxide^atcording to claim 1, wherein the proportion of Ni 
is 60 to 92 mol %, preferably 65 to 8^ mol %, more preferably 75 to 80 mol 

20 % and the total proportion of the eleirLnts M a , M b and M c is 40 to 8 mol %, 



2fer 

based on the total amount of Ni, M a , M b V n( l Mc. 



preferably 35 to 15 mol %, more preferably 25 to 20 mol %, in each case 



3. Nickel mixed hydroxide according to claim 1 and/or claim 2, wherein the 
proportion of the element M a is 10 to 40 mol %, preferably 20 to 30 mol %, 
25 based on the total amount of the elements M a , Mb and Mc. 



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4. Nickel rftixed hydroxides according to at least one of claims 1 to 3, wherein 
the proportion of the element M c is 1 to 30 mol %, based on the total amount 
of elements^M a> Mb and M c . 

5. Nickel mixed hydroxide according to at least one of claims 1 to 4, wherein 
5 the degree of\pxidation a of the element M a , defined according to the 

following formula (I), is from 0.01 to 0.99, preferably 0.1 to 0.9, more 
preferably 0.25 to\).75: 

mA +i > 

<*= An 

10 M a +(x+l >+ M a +X 

^ wherein M a +(x+1) means^the molar quantity of the element M a in the higher 

^fl oxidation state, and M a +( ^ the molar quantity of the element M a in the lower 

m oxidation state, and x is a number between 1 and 3. 

6. Nickel mixed hydroxide according to at least one of claims 1 to 5 in the form 
lH 15 of a powder with an average ^article size from 1 to 100 u,m, 

m 7. Process for the preparationofThe nicke^mixed hydroxides according to any 

;jr one of claims 1 to 6, comprising the reaction of the reaction components 

O required to obtain the relevant mixed hydroxides in the form of water-soluble 

salts of Ni and of the elements M a \ Mb and /optionally Mc in a basic, aqueous 
20 medium for the co-precipitaHon of hydroxide reaction products with the 

formation of a homogeneous suspejision of said reaction products, wherein 
either water-soluble salts of tjic element M a are used in different oxidation 
states or a water-soluble £alt of the eleVnent M a is used in the lower oxidation 
state and a partial^pxldation is carried \out until the desired ratio is obtained 
25 between the different oxidation states of the element M a , or a water-soluble 

salt of the element M a is used in the nigher oxidation state and a partial 
reduction is carried out until the desired ratio is obtained between the 
different oxidation states of the element M a , separation of the water from the 
suspension, and drying of the reaction products. 



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Process according to claim 7, wherein at least one of the reaction components 
is introduce)! into the aqueous medium by anodic oxidation of the 
corresponding metal. 

Process according\o claim 7 or 8, wherein the reaction is carried out at a pH 
from 8 to 13. \ 

Process according to^HY-eqeof claims 7 to 9, wherein partial oxidation is 
carried out by using 6xygen\ H 2 0 2) hypochlorite, peroxodisulfates or 
percarbonates as oxidisingjaeeriy 



Use of the nickel mixedhydroxides according to any one of claims 1 to 6 as 
cathode material in alkaline batteries.