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A kind of high-nickel ternary precursor of polycrystalline structure and preparation method thereof

A polycrystalline structure and precursor technology, applied in structural parts, chemical instruments and methods, nickel compounds, etc., can solve the problems of limited improvement of material properties, achieve inhibition of phase transition, improve cycle stability, improve cycle stability and Effect of charge and discharge capacity performance

Active Publication Date: 2022-04-01
SHAANXI COAL & CHEM TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these technologies have improved the microcrystalline structure to a certain extent in the preparation of the precursor, the ratio of the axial thickness to the radial length of the secondary accumulation particles is similar, and the performance of the material is limited.

Method used

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  • A kind of high-nickel ternary precursor of polycrystalline structure and preparation method thereof
  • A kind of high-nickel ternary precursor of polycrystalline structure and preparation method thereof
  • A kind of high-nickel ternary precursor of polycrystalline structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare the aqueous solution of nickel-cobalt-manganese salt, the mol ratio of nickel-cobalt-manganese is 83:11:6, it is mixed with ammonia solution, sodium hydroxide solution and flow into the 20L reactor that bottom liquid is arranged, make three kinds of metals of nickel-cobalt-manganese The total molar concentration of ions is 2mol / L, and the inert gas N is introduced at the same time 2 Protection, the first stage: pH1=10.7, ammonia concentration C1=10g / L, reaction time t1=20h, rotation speed 600rpm, reaction temperature 50°C, particle size D50 =4um, the ratio of the axial thickness to the radial length of the secondary accumulation particles is 0.27; the second stage: the pH is increased to pH2=11.3, the concentration of ammonia water C2=7g / L, and the reaction is continued for 15h, the particle size is D 50 =7.8um, the ratio of the axial thickness to the radial length of the secondary accumulation particles is 0.36; the third stage: continue to adjust the pH to pH3=...

Embodiment 2

[0045] Prepare the aqueous solution of nickel-cobalt-manganese salt, the mol ratio of nickel-cobalt-manganese is 88:9:3, it is mixed with ammonia solution, sodium hydroxide solution and flow into the 20L reaction kettle that bottom liquid is arranged, make three kinds of metals of nickel-cobalt-manganese The total molar concentration of ions is 1mol / L, and the inert gas N is introduced at the same time 2 Protection, pH1=11, ammonia concentration C1=14g / L, reaction time t1=20h, rotation speed 400rpm, reaction temperature 50°C, particle size D 50 =4.5um, the ratio of the axial thickness to the radial length of the secondary accumulation particles is 0.22; raise the pH to pH2=11.45, the concentration of ammonia water C2=6.5g / L, continue to react for 10h, the particle size is D 50 =8um, the ratio of axial thickness to radial length of the secondary accumulation particles is 0.36; continue to adjust the pH to pH3=11.6, ammonia water concentration C3=4.5g / L, continue to react for 15...

Embodiment 3

[0048] Prepare the aqueous solution of nickel-cobalt-manganese salt, the mol ratio of nickel-cobalt-manganese is 80:10:10, it is mixed with ammonia solution, sodium hydroxide solution and flow into the 20L reactor that bottom liquid is arranged, make three kinds of metals of nickel-cobalt-manganese The total molar concentration of ions is 2.5mol / L, and the inert gas N is introduced at the same time 2 Protection, the first stage: pH1=10.8, ammonia concentration C1=11g / L, reaction time t1=18h, rotation speed 700rpm, reaction temperature 55°C, particle size D 50 =4um, the ratio of the axial thickness to the radial length of the secondary accumulation particles is 0.32; the second stage: increase the pH to pH2=11.4, ammonia concentration C2=7.5g / L, continue to react for 15h, particle size D 50 =7.8um, the ratio of the axial thickness to the radial length of the secondary accumulation particles is 0.4; the third stage: continue to adjust the pH to pH3=11.7, the concentration of amm...

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Abstract

The invention discloses a high-nickel ternary precursor with a polycrystalline structure and a preparation method thereof. The method is characterized in that in the process of preparing the high-nickel ternary precursor, the reaction pH level and the ammonia concentration are adjusted to modify the particle size. Crystal structure, so that the secondary packing particles contain different ratios of axial thickness to radial length. Not only the ratio of the axial thickness to the radial length of the secondary accumulation particles gradually increases from the center of the particle to the surface, but also the whole is radioactive to enhance the stability and compression resistance of the structure, which is beneficial to improve the charging and discharging performance of high-nickel ternary materials. Cycle stability during charge and discharge capacity.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a high-nickel ternary precursor with a polycrystalline structure and a preparation method thereof. Background technique [0002] With the country's development requirements for new energy vehicles, the energy density of power batteries is required to be higher and higher. In order to meet the application of high-nickel ternary materials in electric vehicles, it is proposed for its power performance, cycle performance and thermal stability. higher requirement. High-nickel ternary cathode materials are favored because of their high energy density, but the volume expansion of high-nickel ternary materials during the charge-discharge cycle will cause the particles to expand and shrink during charge-discharge, and micro-cracks appear in the particles, resulting in electrons between particles The reduced conductivity and increased internal resistance lead to structural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525C01P2004/03C01P2004/61C01P2006/40H01M2004/028H01M2004/021Y02E60/10
Inventor 王继锋寇亮王夏阳张诚张超田占元邵乐
Owner SHAANXI COAL & CHEM TECH INST
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