JP2015122269A5 - - Google Patents

Claims (10)

Formula _{Li d Ni 1-a-b} -c Co a M b Nb c O 2 ( where, M is at least one element selected Mn, V, Mg, Ti and Al, 0.05 ≦ a ≦ 0.35, 0 ≦ b ≦ 0.10, 0.006 ≦ c ≦ 0.05, 0.95 ≦ d ≦ 1.20)) A method for producing a positive electrode active material for an electrolyte secondary battery, comprising:
Formula _{Ni 1-a-b-c} Co a M b Nb c (OH) 2 ( where, M is at least one element selected Mn, V, Mg, Ti and Al, 0.05 ≦ a ≦ 0.35, 0 ≦ b ≦ 0.10, 0.006 ≦ c ≦ 0.05, 0.95 ≦ d ≦ 1.20)) is obtained. Crystallization process,
A washing step of washing the niobium-containing transition metal composite hydroxide with an aqueous carbonate solution to obtain a precursor of a positive electrode active material;
A non-mixing step comprising mixing a precursor and a lithium compound to obtain a lithium mixture; and firing the lithium mixture at 700 to 820 ° C. in an oxidizing atmosphere to obtain a lithium transition metal oxide. A method for producing a positive electrode active material for an aqueous electrolyte secondary battery. In the crystallization step, an alkaline aqueous solution is added to a mixed aqueous solution containing at least nickel and cobalt for crystallization, and the general formula Ni _{1-a′-b ′} Co _{a ′} M _{b ′} (OH) ₂ (where M is Mn , V, Mg, Ti and Al, at least one element selected from the group consisting of 0.05 ≦ a ′ ≦ 0.35 and 0 ≦ b ′ ≦ 0.10.) 2. The method according to claim 1, comprising a step of obtaining an oxide, and a step of coating the slurry of the transition metal composite hydroxide with a niobium compound to obtain the niobium-containing transition metal composite hydroxide. A method for producing a positive electrode active material for an aqueous electrolyte secondary battery.   The crystallization step includes a step of obtaining the niobium-containing transition metal composite hydroxide by crystallization by adding a niobium solution and an aqueous alkali solution to a mixed aqueous solution containing at least nickel and cobalt. Item 2. A method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to Item 1.   The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to any one of claims 1 to 3, wherein the pH of the aqueous carbonate solution in the washing step is 8 or more and 12 or less.   5. The non-aqueous electrolyte 2 according to claim 1, wherein the carbonate aqueous solution in the washing step is at least one carbonate aqueous solution selected from potassium carbonate, sodium carbonate, and ammonium carbonate. A method for producing a positive electrode active material for a secondary battery.   The non-aqueous system according to any one of claims 1 to 5, wherein after the firing step, the lithium transition metal composite oxide in an amount (g) with respect to 1 L of water contained in the slurry is 100 to 2000 g. A method for producing a positive electrode active material for an electrolyte secondary battery. Formula _{Li d Ni 1-a-b} -c Co a M b Nb c O 2 ( where, M is at least one element selected Mn, V, Mg, Ti and Al, 0.05 ≦ a ≦ 0.35, 0 ≦ b ≦ 0.10, 0.006 ≦ c ≦ 0.05, 0.95 ≦ d ≦ 1.20)) A positive electrode active material for an electrolyte secondary battery,
A positive electrode active material for a non-aqueous electrolyte secondary battery, wherein the sulfate radical content is 0.2% by mass or less and the chlorine content is 0.1% by mass or less.   The positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 7, wherein a crystallite size of the lithium transition metal composite oxide is 10 to 100 nm. Wherein a lithium transition metal composite oxide is a multi-porous structure, a non-aqueous electrolyte secondary battery according to claim 7 or 8, wherein the specific surface area of 1.4~7.0m 2 / ^g Positive electrode active material.   A non-aqueous electrolyte secondary battery comprising the positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 7 as a positive electrode.