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Positive electrode material precursor and preparation method and application thereof

A positive electrode material and precursor technology, applied in the field of positive electrode material precursor and its preparation, can solve the problems of damage to the material structure, low capacity retention rate, and fragile positive electrode material.

Active Publication Date: 2021-06-08
GUANGDONG BRUNP RECYCLING TECH +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, in the synthesis process of preparing high-power materials, due to the differences in the internal and external structures of the precursor, it is easy to cause flattening during the sintering process.
And because this kind of material has a hollow structure, its tap density and compaction density are low, and the particle strength is not high. When the pole piece is rolled, the positive electrode material is easily broken, which will destroy the original structure of the material and affect the quality of the material. electrical properties
At the same time, due to the large specific surface area of ​​the material, although it is conducive to the increase of its output power, the contact area between the material and the electrolyte increases, and the side reactions increase, resulting in low capacity retention.

Method used

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  • Positive electrode material precursor and preparation method and application thereof
  • Positive electrode material precursor and preparation method and application thereof
  • Positive electrode material precursor and preparation method and application thereof

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Embodiment 1

[0039] The positive electrode material precursor of the present embodiment, its chemical formula is Ni 0.5 co 0.3 mn 0.2 (OH) 2 ; The precursor is in the shape of obvious lamellar stacking, and the particle size widening coefficient of the precursor is K, K=0.75.

[0040] The preparation method of the positive electrode material precursor of the present embodiment comprises the following steps:

[0041] According to the Ni:Co:Mn molar ratio of 5:3:2, dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in deionized water to prepare a metal liquid with a concentration of 0.5mol / L, and adjust the concentration of complexing agent ammonia water to 0.5g / L, and add molten metal, ammonia water, and NaOH into the reactor through a peristaltic pump, control the reaction temperature at 70°C, and stir at a speed of 200r / min. After 48 hours of reaction, switch the concentration of the molten metal to 2mol / L and to 2g / L, continue to react for 72h and then stop, and then go ...

Embodiment 2

[0052] The positive electrode material precursor of the present embodiment, its chemical formula is Ni 0.5 co 0.5 (OH) 2 ; The precursor is in the shape of obvious lamellar stacking, and the particle size widening coefficient of the precursor is 0.72, 0.72=(D v 90-D v 10) / D v 50.

[0053] The preparation method of the positive electrode material precursor of the present embodiment comprises the following steps:

[0054] According to the Ni:Co molar ratio of 5:5, nickel acetate and cobalt acetate were dissolved in deionized water to form a metal liquid with a concentration of 1mol / L, and the concentration of the complexing agent ammonia water was adjusted to 0.8g / L, and the Add molten metal, ammonia water, and NaOH into the reactor together, control the reaction temperature at 60°C, and stir at 400r / min. After 30 hours of reaction, switch the concentration of the molten metal to 1.5mol / L, and the concentration of ammonia water to 2.5g / L, and continue Stop after reacting f...

Embodiment 3

[0063] The positive electrode material precursor of the present embodiment, its chemical formula is Ni 0.2 mn 0.6 (OH) 2 ; The precursor is in the shape of obvious sheet stacking, and the particle size widening coefficient of the precursor is 0.73, 0.73=(D v 90-D v 10) / D v 50.

[0064] The preparation method of the positive electrode material precursor of the present embodiment comprises the following steps:

[0065] Dissolve nickel acetate and cobalt acetate in deionized water according to the molar ratio of Ni:Mn of 2:6, configure a metal liquid with a concentration of 0.5mol / L, adjust the concentration of complexing agent ammonia water to 2.5g / L, and pass through a peristaltic pump Add the metal liquid, ammonia water, and NaOH into the reaction kettle together, control the reaction temperature to 40°C, and the stirring speed to 100r / min. After 48 hours of reaction, switch the concentration of the metal liquid to 3mol / L, and the concentration of ammonia water to 5g / L, a...

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Abstract

The invention belongs to the technical field of battery materials, and discloses a positive electrode material precursor and a preparation method and application thereof, the chemical formula of the positive electrode material precursor is NixCoyMnz(OH)2, 0.2 < = x < = 1, 0 < = y < = 0.5, 0 < = z < = 0.6, 0.8 < = x + y + z < = 1. The positive electrode material precursor is in a sheet layer stacking shape, the particle size broadening coefficient of the positive electrode material precursor is K, and K is smaller than or equal to 0.85. The preparation process of the precursor is effectively controlled and adjusted by adopting a controlled crystallization method and combining a Lamer nucleation growth theoretical model, the prepared precursor has the morphological characteristics of concentrated particle size distribution and high proportion of active crystal face {010}, and the capacity retention rate can reach 91.33% under the multiplying power of 20C.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a positive electrode material precursor and a preparation method and application thereof. Background technique [0002] The traditional Ni-MH and lead-acid power sources have effectively transformed chemical energy into electrical energy and made a decisive contribution to the development and progress of all walks of life, but at the same time inevitably caused serious environmental problems. In view of this, in 2007, Europe proposed the ROSH specification that prohibits the import of metals containing mercury, lead, and cadmium into Europe, so as to suppress the environmental pollution caused by nickel and cadmium. At this stage, it is imperative to completely replace traditional chemical batteries with lithium-ion batteries with high energy density, no memory effect, long service life and environmental protection. To replace traditional fuel vehicles with...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/00C01G53/50H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028C01P2006/40Y02E60/10H01M4/36H01M4/485C01G53/04C01P2002/78C01P2004/03
Inventor 汪乾刘婧婧阮丁山李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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