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Lithium ion ternary positive electrode material with high nickel content and low free lithium content, and preparation method and application thereof

A cathode material, lithium-ion technology, applied in the field of preparation of high-nickel ternary cathode materials, can solve the problems of poor safety of lithium-ion batteries, uneven crystal growth, high content of free lithium, etc., and achieve the effect of compatible and flexible production

Active Publication Date: 2019-06-14
高点(深圳)科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The technical problem solved by the present invention is: firstly, the existing high-nickel ternary positive electrode material with secondary particle structure needs to improve its structural stability and safety during use, because the content of free lithium is high due to the uneven diffusion of lithium, And the inhomogeneity of crystal growth leads to the defects of poor safety and narrow application range of the prepared lithium-ion battery. Therefore, it is urgent to develop a simple and feasible process method for high-nickel ternary positive electrode materials based on primary small particle structures.

Method used

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  • Lithium ion ternary positive electrode material with high nickel content and low free lithium content, and preparation method and application thereof
  • Lithium ion ternary positive electrode material with high nickel content and low free lithium content, and preparation method and application thereof
  • Lithium ion ternary positive electrode material with high nickel content and low free lithium content, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0098] Take by weighing 27kg monohydrate cobalt carbonate (industrial grade, purity 99wt%), 29.0kg tetrahydrate cobalt acetate (industrial grade, purity 99.0wt%), 115.3kg hexahydrate nickel acetate (industrial grade, purity 99.5%), 17.0kg single Manganese sulfate water, 20.22kg manganese acetate (industrial grade, purity 99.5%) powder, 0.015kg nanometer magnesium oxide (ceramic grade, purity 99.5%), 0.045kg magnesium carbonate (ceramic grade, purity 99.7%) joins in the kneader. Then take the container and slowly add 200.0kg of industrial acetic acid (industrial grade, purity 99.5%, its addition amount is 200% of the mass of the active component of the positive electrode material obtained in theory), and 50kg of deionized water to prepare about 30% acetic acid aqueous solution , and then slowly add the above aqueous acetic acid solution into the kneader under stirring, while controlling the reaction temperature of the solution to be 55°C±5°C. The dropwise addition time is 4 hou...

Embodiment 2

[0105] Take by weighing 19.45kg cobalt carbonate (industrial grade, purity 99wt%), 199.6kg nickel sulfate hexahydrate (industrial grade, purity 99.0wt%), 18.8kg manganese carbonate powder (industrial grade, purity 99.0wt%) joins in the kneader , 0.033kg zirconia (ceramic grade, purity 99.5wt%), slowly add 500.0kg industrial adipic acid (industrial grade, purity 99.5wt%), and its addition is 500% of the mass of the positive electrode material active ingredient that makes in theory ), while controlling the reaction temperature of the solution to be 55°C ± 5°C. Adding time is 4h, add and add 0.92kg zirconium nitrate pentahydrate (industrial grade, 95wt%) again, 0.33kg nano zirconium oxide (ceramic grade, purity 99.5wt%) powder is aged under stirring state for 30 hours, and then use The diaphragm pump is pumped into the high-speed centrifuge for centrifugation, and a pipeline demagnetizer is installed on the pumping pipeline to demagnetize (magnetic field strength 11000GS) until t...

Embodiment 3

[0110] Take by weighing 30.88kg heptahydrate cobalt sulfate (industrial grade, purity 98wt%), 104.6kg nickel carbonate (industrial grade, purity 99.0wt%), 16.7kg manganese sulfate monohydrate (industrial grade, purity 99.5wt%) powder joins kneading in the plane. Take the container again and slowly add 80.0kg industrial isooctanoic acid (industrial grade, purity 99.5%, its addition is 80% of the mass of the positive electrode material active ingredient that is theoretically prepared), and 70kg deionized water, to be mixed with about 83% acetic acid aqueous solution, and then slowly add the above aqueous acetic acid solution into the kneader under stirring, while controlling the reaction temperature of the solution to be 55°C±5°C. Adding time is 4h, add 0.09kg nanometer magnesia (ceramic grade, purity 99.5wt%) powder again after dropping, 1.05kg nanometer zirconia (ceramic grade, purity 99.5wt%), aging 30 under stirring state Hours, then use a diaphragm pump to pump into a high...

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Abstract

The invention relates to a lithium ion ternary positive electrode material with high nickel content and low free lithium content, and a preparation method and application thereof. The chemical formulaof the positive electrode material is LiNixCoyMn (1-x-y) MaO2, and the element Mn and the element Al can be replaced with each other, and the replacement ratio is 0-100 percent, wherein: x=0. 6-0.9,y=0. 01-0.2, x + y < 1; M is a doped element selected from Al, Mg and / or Zr, 0<=a<=0.08; the positive electrode material comprises primary particles and secondary particles formed by agglomeration ofthe primary particles, the mass percent of the primary particles is 80.0-99.5 percent, and the average aspect ratio of the positive electrode material is 1.5-3.0, the positive electrode material contains less than 0.16 weight percent of free lithium ions. The positive electrode material of the invention has high Ni content, low free lithium content, high primary particle content and good safety performance, and can be applied to a high voltage and long cycle system. The method for preparing the positive electrode material of the present invention eliminates the traditional precursor precipitation preparation process, and is more favorable for stable homogeneous dispersion and in-situ synthesis of doped elements. The method is economical and feasible, has wide applicability, and has good application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, mainly to the field of positive electrode materials for lithium ion batteries, and in particular to a preparation method and application of a high-nickel ternary positive electrode material mainly composed of primary particles. Background technique [0002] In recent years, with the rise of smart phones and smart cars, the requirements for power energy density and safety of mobile devices are getting higher and higher. At present, the common cathode materials for lithium-ion batteries mainly include lithium cobaltate, lithium manganate, nickel-cobalt lithium manganate and lithium iron phosphate. Among them, lithium cobalt oxide is improved from the lithium nickel oxide material with poor safety in the early stage. Although the weight and energy density is high, it is mainly used in small mobile terminals in the 3C field due to limited cobalt storage. Lithium manganese oxide and lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 赵孝连徐健杨亮亮闵婷婷农廷峰
Owner 高点(深圳)科技有限公司
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