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Preparation method of high-compaction density 523-type ternary positive electrode material

A positive electrode material, high-pressure compaction technology, applied in the field of preparation of high compaction density 523 type ternary positive electrode materials, can solve the problems of low compaction density of ternary materials, secondary spherical particles are easy to break, etc., to improve the chemical phase Capacitance, reducing the chance of side reactions, and the effect of complete crystal structure

Inactive Publication Date: 2018-03-13
JINCHUAN GROUP LIMITED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the general-purpose ternary materials, their microscopic appearance is mostly secondary spherical particles formed by the agglomeration of submicron primary grains. There are many gaps between the primary grains, resulting in low compaction density of ternary materials and electrode roll pressure. Secondary spherical particles are easily broken

Method used

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  • Preparation method of high-compaction density 523-type ternary positive electrode material
  • Preparation method of high-compaction density 523-type ternary positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0025] The preparation method of high compacted density 523 type ternary cathode material comprises the following steps:

[0026] a: Raw material pretreatment: sieve the battery grade lithium carbonate raw material to 200 meshes, and the sieved lithium carbonate is set aside;

[0027] b: Ingredients: Weigh 3kg ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 , the weight of lithium carbonate is calculated and weighed according to the molar ratio Li: (Ni+Co+Mn)=1.04, the magnesium content mixed with magnesium oxide is calculated as 0.25% of the metal element content, and then converted into the weight of magnesium oxide;

[0028] c: Mixing of raw materials: Pour the weighed lithium carbonate, ternary precursor and magnesium oxide into a high-speed mixer in turn to mix, mix at low speed for 10 minutes, and mix at high speed for 25 minutes. After mixing, check that there are no white spots, that is, mix evenly , get the mixture;

[0029] d: Primary and secondary sintering: The ...

Embodiment 2

[0034] The preparation method of high compacted density 523 type ternary cathode material comprises the following steps:

[0035] a: Raw material pretreatment: sieve the battery-grade lithium carbonate raw material to 150 mesh, and the lithium carbonate under the sieve is set aside;

[0036] b: Ingredients: Weigh 3kg ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 , the weight of lithium carbonate is calculated and weighed according to the molar ratio Li: (Ni+Co+Mn)=1.05, the titanium content mixed with nano-scale titanium dioxide is calculated as 0.5% of the metal element content, and then converted into the weight of titanium dioxide;

[0037] c: Mixing of raw materials: Pour the weighed lithium carbonate, ternary precursor and titanium dioxide into a high-speed mixer in turn to mix, mix at low speed for 20 minutes, and mix at high speed for 60 minutes. After mixing, check that there are no white spots, that is, mix evenly. got the mixture;

[0038] d: Primary and seconda...

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Abstract

The invention provides a preparation method of a high-compaction density 523-type ternary positive electrode material, and belongs to the technical field of preparation of a lithium ion battery positive electrode material. A high-compaction density and low-pH value lithium nickel cobalt manganate NCM523-type ternary positive electrode is in a spherical shape, grain D50 of secondary agglomeration particle is 10-12 micrometers, and the size of primary single-crystal particle is 1.5-3 micrometers. The preparation method of the high-compaction density 523-type ternary positive electrode material comprises the steps of doping 0.1-1.0% of metal oxide into a mixture of lithium carbonate and a ternary precursor LiNi<0.5>Co<0.2>Mn<0.3>(OH)<2>, performing primary sintering, paste washing, secondarysintering, breakage, iron removal, sieving and mixing, and finally, obtaining an NCM523-type ternary positive electrode material. By the method, the compaction density of the NCM523-type ternary positive electrode material is effectively improved, a pH value is reduced, the compaction density of the prepared NCM523-type ternary positive electrode material is larger than 3.7g / cm<3>, and the pH value is smaller than 10.80.

Description

technical field [0001] The invention relates to the manufacture of a lithium-ion battery positive electrode material, in particular to a preparation method of a high compacted density 523 type ternary positive electrode material. Background technique [0002] Lithium-ion batteries are a new type of power source developed in recent years. Compared with other rechargeable secondary batteries, lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, and no pollution. Therefore, It is not only widely used in portable electronic equipment (such as mobile phones, digital cameras and laptop computers, etc.), but also has broad application prospects in the fields of large and medium-sized electric equipment such as electric vehicles, electric bicycles, and electric tools. A hotspot of phase research and development. [0003] At present, the development is relatively mature, and the cathode material of lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 常全忠智福鹏郝亚莉王娟辉朱纪念马骞祁世青万雲云
Owner JINCHUAN GROUP LIMITED
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