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A kind of surface modification method of positive electrode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of material performance suppression, material rate performance, and material conductivity reduction, and achieve increased capacity retention and excellent battery life. Chemical properties, effect of reducing contact time

Active Publication Date: 2019-01-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most oxides, fluorides, and phosphates are not conductive, and the formed coating layer will prevent the migration of lithium ions during charge and discharge, reduce the conductivity of the material, increase the internal resistance, and affect the rate performance of the material.
The use of conductive polymers can not only protect the positive electrode material, but also promote the migration of lithium ions. Therefore, it is currently a class of coating materials with excellent performance. However, polymers are easy to agglomerate during the synthesis process and are easily affected by the environment. , it is difficult to achieve uniform coating of the polymer on the surface of the modified material, so that the performance of the material is inhibited

Method used

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  • A kind of surface modification method of positive electrode material of lithium ion battery
  • A kind of surface modification method of positive electrode material of lithium ion battery
  • A kind of surface modification method of positive electrode material of lithium ion battery

Examples

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Embodiment 1

[0035] A kind of surface modification method of lithium-ion battery cathode material of the present invention, its flow chart is as figure 2 As shown, it specifically includes the following steps:

[0036](1) Dissolving the silane coupling agent KH550 in water, adding acetic acid to adjust the pH value of the solution to 4, and preparing a silane coupling agent KH550 solution with a mass concentration of 0.05%;

[0037] (2) Mix and stir the silane coupling agent KH550 solution prepared by lithium-ion battery cathode material nickel cobalt manganese oxide and step (1), then add polypyrrole and mix evenly, wherein the mass of polypyrrole and nickel cobalt lithium manganate The ratio is 0.01:1;

[0038] (3) Spray-dry the uniformly mixed solution in step (2), control the feed rate during the spray-drying process to 5mL / min, and the air outlet temperature to 90°C, and finally collect the powder and dry it at 80°C for 8 hours to complete the lithium-ion battery Surface modificati...

Embodiment 2

[0041] A kind of surface modification method of lithium-ion battery cathode material of the present invention, its flow chart is as figure 2 As shown, it specifically includes the following steps:

[0042] (1) Dissolving the silane coupling agent KH550 in water, adding acetic acid to adjust the pH value of the solution to 4, and preparing a silane coupling agent KH550 solution with a mass concentration of 0.05%;

[0043] (2) Mix and stir the silane coupling agent KH550 solution prepared by lithium-ion battery cathode material nickel cobalt manganese oxide and step (1), then add polypyrrole and mix evenly, wherein the mass of polypyrrole and nickel cobalt lithium manganate The ratio is 0.02:1;

[0044] (3) Spray-dry the uniformly mixed solution in step (2), control the feed rate during the spray-drying process to 10mL / min, and the air outlet temperature to 90°C, and finally collect the powder and dry it at 80°C for 8 hours to complete the lithium-ion battery Surface modifica...

Embodiment 3

[0047] A kind of surface modification method of lithium-ion battery cathode material of the present invention, its flow chart is as figure 2 As shown, it specifically includes the following steps:

[0048] (1) Dissolving the silane coupling agent KH550 in water, adding acetic acid to adjust the pH value of the solution to 4, and preparing a silane coupling agent KH550 solution with a mass concentration of 0.08%;

[0049] (2) Mix and stir the silane coupling agent KH550 prepared by lithium ion battery positive electrode material nickel cobalt manganese oxide and step (1), then add polypyrrole and mix evenly, wherein polypyrrole and positive electrode material nickel cobalt lithium manganate The mass ratio is 0.02:1;

[0050] (3) Spray-dry the uniformly mixed solution in step (2), control the feed rate during the spray-drying process to 10mL / min, and the air outlet temperature to 100°C, and finally collect the powder and dry it at 80°C for 8 hours to complete the lithium-ion b...

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Abstract

The invention discloses a surface modification method for an anode material of a lithium ion battery. The surface modification method comprises the following steps: (1) preparing a coupling agent into a coupling agent solution in mass concentration of 0.05%-1%; (2) mixing the anode material of the lithium ion battery with the coupling agent solution, uniformly stirring, and then adding a conducting polymer and uniformly mixing; (3) spraying and drying the solution obtained after uniformly mixing in step (2), thereby finishing the surface modification of the anode material of the lithium ion battery. According to the surface modification method provided by the invention, homogeneity of the coating material is achieved, the contact time of the anode material with water is reduced, the modification advantage of the conducting polymer is extremely exerted, the anode material has a more excellent electrochemical property and the capacity retention ratio of the material is obviously increased.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for surface modification of positive electrode materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high capacity, high voltage platform, no memory effect, wide source, non-toxic, long cycle life, and good safety performance. They are widely used in communication tools and portable electronic devices. [0003] At present, lithium-ion battery cathode materials mainly include lithium cobaltate, lithium manganate, lithium nickelate, nickel-cobalt lithium manganate, and lithium iron phosphate. Lithium cobaltate material has relatively stable electrochemical properties, excellent electrical conductivity, and good cycle performance. It is the earliest positive electrode material to achieve industrialization and commercialization, but its actual capacity is low (150mAh.g -1 ), and the toxicity is high, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/624H01M10/0525Y02E60/10
Inventor 李新海徐燕王志兴郭华军胡启阳彭文杰潘伟
Owner CENT SOUTH UNIV