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Aluminum-doped nickel-manganese binary precursor and preparation method thereof

A precursor, nickel-manganese technology, applied in the direction of chemical instruments and methods, electrical components, nickel compounds, etc., can solve the problems of poor performance, poor cycle performance, nickel-manganese binary precursor performance can not meet the requirements, etc., to achieve Good cycle performance, good safety performance, and the effect of avoiding large particle size fluctuations

Active Publication Date: 2018-05-01
GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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  • Abstract
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Problems solved by technology

However, the performance of nickel-manganese binary materials developed in China is not good. The key reason is that the performance of nickel-manganese binary precursors cannot meet the requirements. For example, the cycle performance of nickel-manganese binary precursors is poor under high-rate discharge, so it is necessary to develop good nickel Manganese binary cathode material must first be developed in the nickel-manganese binary precursor

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  • Aluminum-doped nickel-manganese binary precursor and preparation method thereof
  • Aluminum-doped nickel-manganese binary precursor and preparation method thereof

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Embodiment 1

[0029] An aluminum-doped nickel-manganese binary precursor of the present invention, the aluminum-doped nickel-manganese binary precursor is in the form of spherical particles (such as figure 1 ), its chemical formula is: NiMn 3 Al 0.2 (OH) 8.6 , its preparation method comprises the following steps:

[0030] (1) Dissolve nickel sulfate and manganese sulfate in pure water at about 45°C to obtain a nickel manganese sulfate solution with a Ni:Mn molar ratio of 1:3 and a concentration of 2mol / L;

[0031] (2) Dissolve aluminum nitrate in an excess sodium hydroxide solution with a mass fraction of 15%, and stir for 2 hours to obtain a sodium metaaluminate solution with a concentration of 0.375 mol / L;

[0032] (3) After cleaning the reaction kettle with pure water, add pure water to reach the overflow port, turn on the stirring motor of the reaction kettle, adjust the frequency so that the rotation speed is about 600r / min, and then add ammonia water with a mass fraction of 15%. M...

Embodiment 2

[0050] An aluminum-doped nickel-manganese binary precursor of the present invention, the aluminum-doped nickel-manganese binary precursor is in the shape of spherical particles, and its chemical formula is: NiMn 3 Al 0.125 (OH) 8.375 , its preparation method comprises the following steps:

[0051] (1) Dissolve nickel sulfate and manganese sulfate in water at about 45°C to obtain a nickel manganese sulfate solution with a molar ratio of Ni:Mn of 1:3 and a concentration of 2mol / L;

[0052] (2) Dissolve aluminum nitrate in an excess sodium hydroxide solution with a mass fraction of 15%, and stir for 2 hours to obtain a sodium metaaluminate solution with a concentration of 0.375 mol / L;

[0053] (3) After cleaning the reaction kettle with pure water, add pure water to reach the overflow port, turn on the stirring motor of the reaction kettle, adjust the frequency so that the rotation speed is about 600r / min, and then add ammonia water with a mass fraction of 15%. Make the concen...

Embodiment 3

[0057] An aluminum-doped nickel-manganese binary precursor of the present invention, the aluminum-doped nickel-manganese binary precursor is in the shape of spherical particles, and its chemical formula is: NiMn 3 Al 0.25 (OH) 8.75 , its preparation method comprises the following steps:

[0058] (1) Dissolve nickel sulfate and manganese sulfate in water at about 45°C to obtain a nickel manganese sulfate solution with a molar ratio of Ni:Mn of 1:3 and a concentration of 2mol / L;

[0059] (2) Dissolve aluminum nitrate in an excess sodium hydroxide solution with a mass fraction of 15%, and stir for 2 hours to obtain a sodium metaaluminate solution with a concentration of 0.375 mol / L;

[0060] (3) After cleaning the reaction kettle with pure water, add pure water to reach the overflow port, turn on the stirring motor of the reaction kettle, adjust the frequency so that the rotation speed is about 600r / min, and then add ammonia water with a mass fraction of 15%. Make the concentr...

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Abstract

The invention discloses an aluminum-doped nickel-manganese binary precursor with a chemical formula: Ni<x>Mn<3x>Al<y>(OH)<8x+3y>, wherein y / x is larger than 0.068 and is smaller than 0.28, x is largerthan 0, and y is larger than 0; and the aluminum-doped nickel-manganese binary precursor is shaped like a spherical particle with the particle size distribution that D50 is equal to 6-8 [mu]m, D10 isequal to 1-6 [mu]m, and D90 is equal to 10-30 [mu]m. The nickel-manganese binary precursor is narrower in particle size distribution and has the tap density of 1.60g / cm<3>; and a lithium ion batteryobtained after the aluminum-doped nickel-manganese binary precursor is sintered with lithium carbonate is higher in energy density, high in voltage platform, good in circulation performance and safetyand excellent in rate capability. The invention further discloses a preparation method. The spherical particle with narrower particle size distribution is obtained by controlling a co-precipitation process of a reactor; and meanwhile, the reaction pH value and temperature are strictly controlled, so that the problem that the performance of a product becomes poor due to large fluctuation of the particle size is avoided.

Description

technical field [0001] The invention belongs to the field of lithium batteries, in particular to a method for preparing an aluminum-doped nickel-manganese binary precursor. Background technique [0002] At present, the highest voltage of industrially produced lithium batteries is generally 4.35V. The positive electrode material used in lithium batteries is mainly lithium cobalt oxide, and lithium cobalt oxide is expensive and toxic. Compared with traditional cathode materials such as lithium cobaltate, lithium manganese oxide, ternary materials, and lithium iron phosphate, nickel-manganese binary cathode materials have a high voltage platform, good safety performance, superior cycle performance and rate performance, and high-voltage batteries Easy to match and other advantages. [0003] As power batteries have higher and higher requirements on the power performance of materials, coupled with the progress in the research of high-voltage electrolytes in recent years, domestic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/50H01M4/52H01M10/052
CPCC01G53/006H01M4/502H01M4/523H01M10/052Y02E60/10
Inventor 曹学斌唐素娟刘务华王昌胤易鑫
Owner GUIZHOU DALONG HUICHENG NEW MATERIAL CO LTD
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