Production method of positive electrode active material for non-aqueous electrolyte secondary battery and positive electrode active material
A positive electrode active material, which gives a non-aqueous electrolyte secondary battery capable of high input/output where resistance due to a battery reaction in a low temperature environment is suppressed, is produced by a method comprising: (a)providing a nickel hydroxide which is represented by the general formula Ni 1−(x+y) Co x M y (OH) 2 , (b)heating the nickel hydroxide at a temperature not lower than 600° C. and not higher than 1000° C. to produce a nickel oxide which is represented by the general formula Ni 1−(x+y) Co x M y O; and (c)mixing the nickel oxide and a lithium compound to obtain a mixture and heating the mixture at a temperature not lower than 700° C. and not higher than 850° C. to produce a lithium-containing composite oxide which is represented by the general formula LiNi 1−(x+y) Co x M y O 2 , where 0.1≦x≦0.35 and 0.03≦y≦0.2 are satisfied and M is at least one selected from the group consisting of Al, Ti and Sn.
1. A production method of a positive electrode active material for a non-aqueous electrolyte secondary battery, comprising:
(a) a step of providing a nickel hydroxide (x) which is represented by the general formula
Ni 1−(x+y) Co x M y (OH) 2 ,
where 0.1≦x≦0.35 and 0.03≦y≦0.2 are satisfied and M is at least one selected from the group consisting of Al, Ti and Sn;
(b) a step of heating said nickel hydroxide (x) at a temperature not lower than 800° C. and not higher than 950° C. to produce a nickel oxide (y) which is represented by the general formula
Ni 1−(x+y) Co x M y O,
where 0.1≦x≦0.35 and 0.03≦y≦0.2 are satisfied and M is at least one selected from the group consisting of Al, Ti and Sn; and
(c) a step of mixing said nickel oxide (y) with a lithium compound to obtain a mixture and heating said mixture at a temperature not lower than 700° C. and not higher than 850° C. to produce a lithium-containing composite oxide (z) which is represented by the general formula
LiNi 1−(x+y) Co x M y O 2 ,
where 0.1≦x≦0.35 and 0.03≦y≦0.2 are satisfied and M is at least one selected from the group consisting of Al, Ti and Sn.
2. The production method of a positive electrode active material for a non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said step (a) of providing a nickel hydroxide comprises neutralizing an aqueous solution containing a nickel salt, a cobalt salt and an M salt to coprecipitate a ternary composite hydroxide and drying said ternary composite hydroxide.
3. The production method of a positive electrode active material for a non-aqueous electrolyte secondary battery in accordance with claim 1 , wherein said element M is Al.