Preparation method of lithium ion battery ternary cathode material

A lithium-ion battery, cathode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of uneven particle size distribution, affecting high temperature cycle performance, secondary spherical particle breakage, etc., to achieve uniform morphology, improve High temperature cycle performance, the effect of suppressing agglomeration

Active Publication Date: 2012-06-20
PULEAD TAIAN TECH IND
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  • Abstract
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  • Application Information

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Problems solved by technology

In the Chinese patent application publication CN101847722A, micron-sized single crystal particles are prepared by grinding the micron precursor into nano-scale, and then sintering at high temperature, but the particles prepared by this method are prone to agglomeration and the particle size distribution is not uniform
In the Chinese patent application publication CN101621125A, polyvinyl alcohol is added during the grinding process to improve particle dispersion, and multi-step sintering is used to prepare single crystal particles with good dispersion, but the process is relatively complicated and the production cycle is long
[0005] 2. Poor high temperature cycle performance
However, during the rolling process of the pole piece, the secondary spherical particles will be broken, so that the internal particles will be exposed to the electrolyte. Since the internal particles are not coated, they will inevitably be corroded by HF, etc., which will affect the high temperature cycle performance.

Method used

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  • Preparation method of lithium ion battery ternary cathode material
  • Preparation method of lithium ion battery ternary cathode material
  • Preparation method of lithium ion battery ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Prepare the coated ternary cathode material Li according to the following steps 1.03 [Ni 0.5 co 02 mn 0.3 ] 0.90 Ti 0.05 al 0.05 o 2

[0025] 1) According to the molar ratio of Li:(Ni+Co+Mn):Ti:Al=1.03:0.90:0.05:0.05, accurately weigh 86.53g LiOH·H 2 O, 165.41gNi 0.5 co 0.2 mn 0.3 (OH) 2 , 7.99g TiO 2 , 7.8g Al 2 o 3 . 5.35 g of soluble starch was ball-milled for 1 hour, then added to a colloid mill for grinding for 8 hours, dried in vacuum at 100° C., and then pressed into tablets using a tablet machine.

[0026] 2) The molding material obtained in step 1) is heated to 950° C. at a heating rate of 3° C. / min, kept for 16 hours, cooled naturally to room temperature, and crushed by an air jet mill.

[0027] 3) Weigh 38.77g of zirconium isopropoxide according to the molar ratio of Zr:(Ni+Co+Mn+Ti+Al)=0.05:1, dissolve in isopropanol, and slowly add 201.22g of jet mill to crush The final step 2) product was stirred at room temperature for 1 h, filtered, wa...

Embodiment 2

[0033] Prepare the coated ternary cathode material Li according to the following steps 1.06 [Ni 0.5 co 0.2 mn 0.3 ] 0.95 Mg 0.025 al 0.025 o 2 :

[0034] 1) Accurately weigh 78.32g Li according to the molar ratio of Li:(Ni+Co+Mn):Mg:Al=1.06:0.95:0.025:0.025 2 CO 3 , 174.06g Ni 0.5 co 0.2 mn 0.3 (OH) 2 , 2g MgO, 3.9g Al 2 o 3 12.8g of PVP was ball milled and mixed for 1 hour, then added into a colloid mill to grind for 5 hours, dried in vacuum at 100°C, and then pressed into tablets using a tablet machine.

[0035] 2) The molding material obtained in step 1) is heated to 970° C. at a heating rate of 5° C. / min, kept for 12 hours, cooled naturally to room temperature, and crushed by a jet mill.

[0036] 3) Weigh 18.79g of titanium chloride according to the molar ratio of Ti:(Ni+Co+Mn+Mg)=0.05:1, dissolve it in water, slowly add the product of step 2) after being broken by the jet mill under stirring, and add dropwise Adjust the pH to 11 with ammonia water, stir at...

Embodiment 3

[0039] Prepare the coated ternary cathode material Li according to the following steps 1.03 [Ni 0.5 co 0.2 mn 0.3 ] 0.95 Ti 0.05 o 2 :

[0040] 1) Accurately weigh 86.53g LiOH·H according to the molar ratio of Li:(Ni+Co+Mn):Ti=1.03:0.95:0.05 2 O, 174.06gNi 0.5 co 0.2 mn 0.3 (OH) 2 , 7.99g TiO 2 , 5.38g of soluble starch was ball-milled for 1 hour, then added to a colloid mill for grinding for 8 hours, dried in vacuum at 100°C, and then pressed into tablets using a tablet machine.

[0041] 2) The molding material obtained in step 1) is heated to 950° C. at a heating rate of 3° C. / min, kept for 16 hours, cooled naturally to room temperature, and crushed by an air jet mill.

[0042] 3) Weigh 37.51g of aluminum nitrate according to the molar ratio of Al:(Ni+Co+Mn+Ti)=0.05:1, dissolve it in water, and under stirring, slowly add the product of step 2) after being crushed by the jet mill, and add dropwise Adjust the pH to 9 with ammonia water, stir at 60°C for 2h, filter...

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Abstract

The invention discloses a preparation method of a lithium ion battery ternary cathode material. According to the preparation method, full grinding is performed through a colloid mill to improve the reactivity of a precursor and a lithium salt and the uniformity of a mixed material; and a carbon chain organic additive is added in the process of grinding to improve the viscosity of a sizing material, inhibit raw material segregation in the process of drying, quickly balance the temperature of each part of a system in the process of high-temperature reaction and inhibit agglomeration among particles, so that a uniform-appearance and regular mono-crystal ternary cathode material is obtained. Meanwhile, the ternary cathode material is doped and subjected to surface coating modification, so that the structure of the material is stabilized, the side reaction between the material and electrolyte is inhibited, and the high-temperature cycle performance of the material is improved.

Description

technical field [0001] The invention belongs to the field of cathode materials for lithium-ion secondary batteries, and in particular relates to a preparation method for a ternary cathode material for a lithium-ion battery with high compaction density and good high-temperature cycle performance. Background technique [0002] Lithium-ion battery, as a new type of green secondary battery, has the advantages of small size, light weight, large specific capacity, long cycle life, small self-discharge, and no memory effect, and has been widely used. In recent years, with the rapid development of mobile phones and notebooks, as well as the demand for electric vehicles and hybrid vehicles, higher requirements have been placed on the energy density of batteries. In lithium-ion batteries, cathode materials have become a key factor restricting the development of batteries with high energy density. Commercial lithium-ion batteries mostly use LiCoO 2 As a cathode material, cobalt resou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/1391
CPCY02E60/122Y02E60/10
Inventor 张树涛魏伟杨新河周恒辉
Owner PULEAD TAIAN TECH IND
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