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Preparation method of nickel magnesium cobalt hydroxide

A technology of hydroxide and nickel-manganese-cobalt, which is applied in the direction of nickel oxide/nickel hydroxide, electrode manufacturing, structural parts, etc., can solve problems such as solid nickel-manganese-cobalt hydroxide, and achieve local overconcentration , The effect of saving production costs

Active Publication Date: 2007-05-23
BYD CO LTD
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Problems solved by technology

Although it is possible to prepare spherical nickel manganese cobalt hydroxide by the above method, since the above three solutions are respectively input by pumps, it is difficult to really convert the NH 3 The molar ratio of / (Ni+Co+Mn) and the pH value of the system solution are controlled within the required range, and the above two factors are the key to determining the morphology of the obtained solid nickel manganese cobalt hydroxide, so in actual operation It is difficult to guarantee that the obtained solid nickel manganese cobalt hydroxide must be spherical

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  • Preparation method of nickel magnesium cobalt hydroxide
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  • Preparation method of nickel magnesium cobalt hydroxide

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preparation example Construction

[0023]According to the preparation method of the nickel manganese cobalt hydroxide provided by the present invention, the mixed solution A and the mixed solution B are subjected to coprecipitation reaction in the bottom solution C, the mixed solution A contains nickel salt, manganese salt, cobalt salt, so The mixed solution B is a strong alkali solution, the bottom solution C is an ammonia solution, wherein, the mixed solution A also contains ammonium salt, the mixed solution B also contains ammonia water, and is added to the mixed solution A of the equivalent reaction The ammonium salt and the ammonia water in the mixed solution B are equal to the molar concentration of ammonia in the bottom solution C after the mixed solution A and the mixed solution B are mixed.

[0024] In the present invention, the available chemical formula of the nickel manganese cobalt hydroxide is LiNi x mn y co 1-x-y (OH) 2 , where 0.05≤x≤0.8, 0.1≤y≤0.4, x+y≤1.

[0025] In the present invention, ...

Embodiment 1

[0035] This example is used to illustrate the preparation method of nickel manganese cobalt hydroxide precipitation provided by the present invention.

[0036] At 25°C, 20 liters of mixed liquid A obtained by dissolving 10 moles of cobalt nitrate, 10 moles of nickel nitrate, 10 moles of manganese nitrate and 10 moles of ammonium nitrate in deionized water was continuously added to the already added 5 liters through a flow meter and a porous nozzle. 0.5 mol / liter of ammonia water is used as the bottom liquid C in a reactor with a capacity of 10 liters. At the same time, 11 liters of mixed liquid B obtained by dissolving 77 moles of potassium hydroxide and 5.5 moles of ammonia water in deionized water is connected to the acid-base controller The metering pump is continuously added to the above-mentioned reactor, and the pH value of the solution in the reactor is controlled to be 10.5 during the reverse process, and air is continuously fed into the reactor, and the flow rate of th...

Embodiment 2

[0038] This example is used to illustrate the preparation method of nickel manganese cobalt hydroxide precipitation provided by the present invention.

[0039] At 15°C, 20 liters of mixed liquid A obtained by dissolving 15 moles of cobalt chloride, 15 moles of nickel chloride, 15 moles of manganese chloride and 20 moles of ammonium chloride in deionized water was continuously added to the In a reactor with a capacity of 10 liters containing 5 liters of 1 mol / liter ammonia water as the bottom liquid C, 21 liters of mixed liquid B obtained by dissolving 115.5 moles of sodium hydroxide and 21 moles of ammonia water in deionized water is controlled by acid-base control The metering pump connected to the reactor is continuously added to the above-mentioned reactor, the pH value of the solution in the reactor is controlled to be 11 during the reverse process, and 30% by weight of hydrogen peroxide solution is continuously added dropwise to the reactor, and the flow rate of hydrogen p...

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Abstract

The invention relates to a way to prepare nickel, manganum and cobalt hydroxide. The method includes making the mixed solution a coprecipitate with mixed solution B in base solution C. The mixed solution A contains nickel salt, manganese salt and cobalt salt, the mixed solution B is a strong base solution, the base solution C is aqueous ammonia solution. The solution A also contains ammonium salt while solution B also contains aqueous ammonia; besides, after being mixed, the molarity of ammonia in solution A and solution B is the same with that in solution C. The precipitation in the invention is easier to control the ammonia density in reaction system so that it managed to control the precipitation particle size of the nickel, manganese and cobalt hydroxide precipitation. The previous reaction can go smoothly at 5-40 Deg C without extra heating and temperature-controlling device so that can substantially reduce the producing cost.

Description

technical field [0001] The invention relates to a method for preparing nickel-manganese-cobalt hydroxide, a cathode material of a lithium ion battery, in particular to a method for preparing nickel-manganese-cobalt hydroxide by a co-precipitation method. Background technique [0002] Lithium-ion batteries have the characteristics of high energy, long life, and low pollution, and are widely used in many fields such as portable electronic devices and electric vehicles. The cathode material occupies the most important position in the composition of lithium-ion battery products. The quality of the cathode material directly determines the performance index of the final secondary battery product, and its performance and price directly affect the performance and price of the lithium-ion battery. [0003] At present, the positive electrode materials of lithium-ion batteries that have been studied more include the transition metal oxide LiCoO with a layered structure. 2 , LiNiO 2 ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04H01M4/04H01M4/48
CPCY02E60/10
Inventor 肖峰程堂利李艳
Owner BYD CO LTD
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