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Ternary positive electrode material precursor with specific morphology and preparation method thereof

A technology of positive electrode material and precursor, applied in the field of ternary positive electrode material precursor and its preparation, can solve the problems that affect the processing performance such as sintering, do not involve primary particles, and do not fully elaborate, so as to save washing cost and size Uniformity and the effect of reducing the number of washings

Active Publication Date: 2020-09-29
福建常青新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]CN105731553A, CN105355907A, and CN107342417A all mentioned the impact of the morphology and development of the primary particles of the precursor on the performance of the finished product, but the morphology described therein does not involve lath primary particles
What is mentioned in CN105731553A is the precursor of crystal family shape as primary particle, but the particle of this shape is too large, which affects the processing performance such as subsequent sintering; The body is not explained; CN107342417A describes a filamentous precursor, and it is a large particle precursor with D50=11-15um, and does not describe the small particle precursor
[0004] It can be seen from the above that many existing patents are related to the preparation method of the precursor of the ternary cathode material and the morphology of its primary particles, but the primary particle is a plate Strip precursors are not fully described

Method used

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  • Ternary positive electrode material precursor with specific morphology and preparation method thereof
  • Ternary positive electrode material precursor with specific morphology and preparation method thereof
  • Ternary positive electrode material precursor with specific morphology and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A ternary cathode material precursor with specific morphology, the molecular formula is Ni 0.65 co 0.07 mn 0.28 (OH) 2 :D 0 =1.63um,D 10 =2.76um, D 50 =3.85um,D 90 =5.37um,D 100 =8.6um; the average particle size of the primary particles of this type of precursor is 200-300nm, and the secondary particles are formed by the agglomeration of lath-shaped primary particles. Tap density 2.02g / cm 3 , specific surface area 10m 2 / g, bulk density 1.47g / cm 3 , Na content 73ppm. Spherical or spherical.

[0037] The preparation method of the above-mentioned ternary positive electrode material precursor with specific morphology comprises the following steps:

[0038] S1: According to Ni 0.65 co 0.07 mn 0.28 (OH) 2 The molar ratio of metal elements in the chemical formula prepares the soluble mixed salt solution that the molar concentration of metal ions is 1.6mol / L, and the solvent is water; prepare 32% sodium hydroxide solution and 22% ammonia solution at the same ti...

Embodiment 2

[0051] A ternary cathode material precursor with specific morphology, the molecular formula is Ni 0.52 co 0.20 mn 0.28 (OH) 2 :D 0 =2.39um,D 10 =6.547um, D 50 =10.12um,D 90 =16.39um,D 100 =31.05um; the average particle size of the primary particles of this type of precursor is 200-300nm, and the secondary particles are formed by the agglomeration of lath-shaped primary particles. Tap density 2.34g / cm 3 , specific surface area 8m 2 / g, bulk density 1.9g / cm 3 , Na content 80ppm. Spherical or spherical.

[0052] The preparation method of the above-mentioned ternary positive electrode material precursor with specific morphology comprises the following steps:

[0053] S1: According to Ni 0.52 co 0.20 mn 0.28 (OH) 2 The molar ratio of metal elements in the chemical formula prepares the soluble mixed salt solution that the molar concentration of metal ions is 2.0mol / L, and the solvent is water; prepare 32% sodium hydroxide solution and 22% ammonia solution at the same...

Embodiment 3

[0065] Example 3 is basically the same as Example 1, except that in step S2, the ammonia concentration is controlled at 6.5 g / L, and then sodium hydroxide solution is added to adjust the pH of the mixture to 11.3-11.5.

[0066] The appearance of the product obtained in Example 3 is substantially the same as that of the product in Example 2, and will not be repeated here.

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Abstract

The invention relates to the technical field of lithium battery cathode materials and particularly relates to a preparation method of a ternary positive electrode material precursor with a specific morphology. A molecular formula of a precursor is Ni<x>Co<y>Mn<1-x-y>(OH)2, wherein x is larger than or equal to 0.5 and smaller than or equal to 0.9, y is larger than or equal to 0.05 and smaller thanor equal to 0.2, z is larger than or equal to 0 and smaller than or equal to 0.15, tap density is larger than or equal to 1.95 g / cm<3>, the specific surface area is 8-15 m<2> / g, apparent density is 1.4-2.0 g / cm<3>, the Na content is smaller than or equal to 100 ppm. According to the positive electrode material precursor, primary particles are 200-300nm in size, the size is uniform, and the sphericity degree of a small-particle precursor and a large-particle precursor is perfect; compared with the prior art, the lath-shaped ternary positive electrode material precursor provided by the inventionprovides good processability for subsequent washing, sintering and the like.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode materials, in particular to a ternary cathode material precursor with a specific morphology and a preparation method thereof. Background technique [0002] Due to its high energy density and no memory effect, lithium-ion batteries are widely used in 3C, power and energy storage fields, and become a new generation of sustainable green power sources. At present, the main cathode materials for lithium-ion batteries mainly include lithium cobaltate, lithium nickel-cobalt manganate, lithium iron phosphate and lithium manganate, and with the development of various fields, the market has higher and higher requirements for these materials, and these The performance of materials has a great relationship with their morphology and structure. [0003] CN105731553A, CN105355907A, and CN107342417A all mentioned the influence of the morphology and development of the primary particle of the precu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M10/0525C01G53/006C01P2006/11C01P2006/12C01P2006/80C01P2004/62C01P2004/20C01P2004/03C01P2004/32C01P2004/50C01P2004/61Y02E60/10
Inventor 王隆肇晁锋刚石小东钟姝张东学颜志梁彭贝利郑承辉邹元辉张刚
Owner 福建常青新能源科技有限公司
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