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Preparation method of ternary positive electrode material for lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as poor particle conductivity, damage to battery performance, and porosity, so as to improve electronic conductivity and lithium ion Diffusion rate, improve electrical properties and structural stability, reduce the effect of particle breakage

Active Publication Date: 2019-07-12
SHANSHAN ENERGY (NINGXIA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current morphology of ternary cathode materials is mainly secondary spherical particles formed by the agglomeration of primary particles. Due to the gaps between the primary particles, the volumetric energy density of the material is low, and the conductivity between the particles is not good, and The volume of the primary particles will change after cycling, and the directions of the volume change of these anisotropic primary particles are different, which eventually leads to the widening of the gaps between the particles, the appearance of pores, and even the rupture of the agglomerated secondary particles to destroy the battery. performance

Method used

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  • Preparation method of ternary positive electrode material for lithium ion battery
  • Preparation method of ternary positive electrode material for lithium ion battery
  • Preparation method of ternary positive electrode material for lithium ion battery

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Embodiment 1

[0025] A preparation method of lithium ion battery ternary cathode material of the present invention, comprises the following steps:

[0026] 1) Prepare layered ternary precursor by co-precipitation method: add 2.0mol / L nickel-cobalt-manganese sulfate solution (the molar ratio of nickel, cobalt, and manganese elements is 6:2:2) into the reactor, and then add NaOH solution (mass fraction 20%), ammonia water (mass fraction 20%), control the pH value at about 11.5, heat to 55°C, react for 10h, filter, wash, and dry to obtain (Ni 0.6 co 0.2 mn 0.2 )(OH) 2 ;

[0027] 2) Get 500g of (Ni 0.6 co 0.2 mn 0.2 )(OH) 2 Disperse in 2.0L formamide and stir at 500rpm for 12h to generate a positively charged layered precursor dispersion;

[0028] 3) under the condition of constant stirring, add 250mL negatively charged graphene oxide solution (1.0mg / mL) to step 2) in the layered precursor dispersion that obtains, the consumption of layered compound in the graphene oxide solution is 0....

Embodiment 2

[0037] A preparation method of lithium ion battery ternary cathode material of the present invention, comprises the following steps:

[0038] 1) Prepare layered ternary precursor by co-precipitation method: add 2.0mol / L nickel-cobalt-manganese sulfate solution (the molar ratio of nickel, cobalt, and manganese elements is 1:1:1) into the reactor, and then add NaOH solution (mass fraction 25%), ammonia water (mass fraction 20%), control the pH value at 11.0, heat to 55°C, react for 10h, filter, wash, and dry to obtain (Ni 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 2 ;

[0039] 2) Get 500g of (Ni 1 / 3 co 1 / 3 mn 1 / 3 )(OH) 2 Disperse in 2.0L isopropanol and stir at 500rpm for 12h to generate a positively charged layered precursor dispersion;

[0040] 3) Under the condition of constant stirring, add 250mL containing 1.5gAl(NO 3 ) 3 Negatively charged graphene oxide solution (1.0mg / mL), the amount of layered compound in the graphene oxide solution is 3.5% of the total mass of the layered precurs...

Embodiment 3

[0047] A preparation method of lithium ion battery ternary cathode material of the present invention, comprises the following steps:

[0048] 1) Prepare layered ternary precursor by co-precipitation method: add 2.0mol / L nickel-cobalt-manganese sulfate solution (the molar ratio of nickel, cobalt, and manganese elements is 8:1:1) into the reactor, and then add NaOH solution (mass fraction 25%), ammonia water (mass fraction 20%), control the pH value at 12.0, heat to 55°C, react for 10h, filter, wash, and dry to obtain (Ni 0.8 co 0.1 mn 0.1 )(OH) 2 ;

[0049] 2) Get 500g of (Ni 0.8 co 0.1 mn 0.1 )(OH) 2 Disperse in 2.0L N-N-dimethylformamide, stir at 500rpm for 12h to generate a positively charged layered precursor dispersion;

[0050] 3) Under the condition of constant stirring, add 250mL containing 1.8gMg(NO 3 ) 2 Negatively charged graphene oxide solution (1.0mg / mL), the amount of layered compound in the graphene oxide solution was 4.1% of the total mass of the layer...

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Abstract

The invention discloses a preparation method of a lithium ion battery ternary anode material. The preparation method comprises the following steps: first preparing a lamellar ternary precursor by use of a coprecipitation method, and generating lamellar precursor dispersion liquid with positive charge in a stripping manner in a stripping agent; adding lamellar compound dispersion liquid with negative charge in the obtained lamellar precursor dispersion liquid under the condition of continuously stirring, and self-assembling layer by layer through the electrostatic effect so as to prepare lamellar ordered ternary precursor precipitation; mixing the lithium salt with the lamellar ordered ternary precursor precipitation in proportion, sintering to obtain the lamellar ordered lithium ion battery ternary anode material under high temperature. By use of the method disclosed by the invention, an ordered lithium ion migration channel is convenient to form, and the electrochemical property and the stability of the product can be improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a positive electrode material of a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in notebook computers, mobile phones, digital products and other fields because of their high energy density, good safety performance, long cycle life, and environmental friendliness. Gradually used as a power battery in the field of transportation, such as electric vehicles, electric buses, etc. The expansion of these application fields has put forward higher requirements for the rate performance, cycle performance and safety performance of lithium-ion batteries. [0003] Lithium-nickel-cobalt-manganese composite oxide ternary cathode materials have the characteristics of high capacity, good thermal stability and low cost, and have become the mainstream of current research and commercial applications. However, the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李艳周惠蔡振勇谭欣欣雷刚
Owner SHANSHAN ENERGY (NINGXIA) CO LTD
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