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Surface coating method for ternary positive material of lithium ion battery

A lithium-ion battery, ternary material technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of short cycle life, poor safety, and insignificant side reaction inhibition of ternary materials.

Active Publication Date: 2014-10-22
厦门太和动力电源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ternary materials have high energy density, but the ternary materials have defects of short cycle life and poor safety
[0006] However, although the coating method of the prior art improves the cycle stability of the material, it cannot solve the problem of coating uniformity well, resulting in insignificant inhibition of side reactions, and at the same time, the coating with large molar mass Introduced, leading to a decrease in the mass fraction of active substances, thereby reducing the capacity

Method used

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  • Surface coating method for ternary positive material of lithium ion battery
  • Surface coating method for ternary positive material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 0.1-0.5g of analytically pure lithium fluoride and add it into 100g of dimethyl sulfoxide solvent, and form a uniform solution after stirring for 5 hours. 100g of positive electrode ternary material LiNi with a size of 1-5 microns 0.333 co 0.333 mn 0.333 o 2 Put into the above solution and heat to 30 o C, 500rpm electromagnetic stirring for 30 minutes. at 60 o C and under the situation of continuing to stir, add the ethanol of 30g to above-mentioned suspension liquid, drip according to the speed of 2g / min, continue to keep temperature and stir 10 hours after dropwise addition, seal simultaneously to avoid ethanol volatilization. Stop stirring and heating, let it stand for 1 hour, skim off the supernatant, filter the precipitate with suction, and wash several times with a small amount of ethanol. transfer to 70 o Bake in a blast oven for 5 hours. into the muffle furnace, in the air according to 0.5 o C / min speed heating to 600 o C for 12 hours, and then 0...

Embodiment 2

[0031] Weigh 0.5-1 g of analytically pure lithium fluoride and add it into 100 g of dimethylformamide solvent, and stir for 2 hours to form a uniform solution. 200g of positive electrode ternary material LiNi with a particle size between 5-10 microns 0.4 co 0.2 mn 0.4 o 2 Put into the above solution and heat to 40 o C, 1000rpm electromagnetic stirring for 10 minutes. at 40 o C. In the case of continuing to stir, add 50g of ethyl acetate to the above suspension, drop it in at a rate of 5g / min, keep the temperature and stir for 5 hours after the dropwise addition, and seal it to avoid volatilization of ethyl acetate. Stop stirring and heating, let it stand for 1 hour, skim off the supernatant, filter the precipitate with suction, and wash several times with a small amount of ethyl acetate. transfer to 70 o Bake in a blast oven for 5 hours. Transfer to the muffle furnace, in the air according to 1 o C / min speed heating to 450 o C for 24 hours, and then 1 o C / min speed ...

Embodiment 3

[0033] Weigh 1-2 g of analytically pure sodium fluoride and lithium oxide mixture according to the stoichiometric ratio, add it to 100 g of diethylformamide solvent, and start stirring. With the help of a small amount of water in the air, lithium oxide was dissolved into lithium hydroxide, and a homogeneous solution was formed after stirring for 10 hours. 200g of positive electrode ternary material LiNi with a size of 0.5-1 micron 0.5 co 0.2 mn 0.3 o 2 Put into the above solution and heat to 50 o C, 1000rpm electromagnetic stirring for 10 minutes. at 50 o C, in the case of continuing to stir, add 70g of ethanol, propanol, isopropanol equal-volume mixed solution to the above suspension, drop in according to the speed of 5g / min, continue to keep the temperature and stir for 5 hours after the dropwise addition is completed, At the same time, it is sealed to prevent the volatilization of volume mixtures such as methanol and ethanol. Stop stirring and heating, let it stand f...

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Abstract

The invention discloses a surface coating method for a ternary positive material of a lithium ion battery. The surface coating method comprises the following steps: 1, mixing lithium fluoride with a strong polar solvent in the mass ratio of (0.1-100) to 100, and stirring to form a homogeneous solution A; 2, transferring the ternary material into the solution A in the mass ratio of lithium fluoride to the ternary material of (0.05-10) to 100 and continuously stirring to form a turbid liquid B; 3, adding a poor solvent to the turbid liquid B which is stirred in the mass ratio of the turbid liquid B to the poor solvent of (0.1-100) to 1, thereby forming a turbid liquid C, and aging for 0.5-48 hours; 4, filtering the turbid liquid C, washing a filter cake by use of a volatile lithium fluoride poor solvent and drying the filter cake at 50-100 DEG C; and 5, calcining the filter cake, thereby obtaining the lithium fluoride coated ternary positive material. The surface coating method is capable of realizing relatively even coating, effectively inhibiting side reactions of an electrode, prolonging the cycle life of the electrode, lowering the safety risk of the battery and reducing the capacitance loss of the battery.

Description

technical field [0001] The invention relates to a modification method of a positive electrode ternary material of a lithium ion battery, in particular to a surface coating method of a lithium ion battery positive electrode ternary material. Background technique [0002] Lithium-ion secondary batteries have been widely used in production and life because of their advantages such as high capacity, small size, long life, low self-discharge rate and environmental friendliness. However, with the accelerated upgrading of electronic digital products and the development of the new energy industry, lithium-ion secondary batteries are facing enormous challenges. Among them, high energy density, long life and high safety are the key technical issues of lithium-ion secondary batteries . [0003] Ternary materials have higher energy density, but the ternary materials have defects of short cycle life and poor safety. Among them, the reason for the short cycle life is that the side react...

Claims

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Application Information

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IPC IPC(8): H01M4/1397
CPCH01M4/1391H01M4/628H01M10/0525Y02E60/10
Inventor 马军玲王雪晴
Owner 厦门太和动力电源科技有限公司
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