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Coating slurry for current collector of lithium ion battery as well as current collector and preparation method thereof

A lithium-ion battery and current collector technology, applied in the field of lithium-ion batteries, can solve problems such as increased contact internal resistance and unsatisfactory self-discharge, and achieve the effects of improved performance, strong repeatability, and strong processability

Active Publication Date: 2019-06-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the battery is gradually activated, the temperature rises, the contact internal resistance between the current collector and the active material becomes larger through physical contact, self-discharge, etc. cannot meet the requirements of high specific energy density stability

Method used

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  • Coating slurry for current collector of lithium ion battery as well as current collector and preparation method thereof
  • Coating slurry for current collector of lithium ion battery as well as current collector and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the coating slurry for the current collector of the lithium ion battery proposed by the present invention comprises the following steps:

[0037] S1. Add CMC and deionized water to the disperser at a mass ratio of 5:95, control the temperature of the disperser to 25°C, and the speed to 1800rmp, and disperse for 4 hours to obtain an anti-sedimentation dispersion;

[0038] S2. According to the percentage by weight, take 15% anti-sedimentation dispersion liquid and 1% SiC polyether-modified silicone oil surfactant and add them to the disperser, keep the temperature of the disperser at 25°C and the speed of 1200rmp, disperse for 2 hours, and then add 1.5 % graphene and 74% deionized water, rotating speed 2800rmp, disperse for 2 hours, add 1.5% carbon nanotubes, rotating speed 2800rmp, disperse for 1 hour, add 2% conductive carbon black, rotating speed 2800rmp disperse for 1 hour to obtain black slurry; Add 5% water-based acrylonitrile multi-polymer...

Embodiment 2

[0041] The preparation method of the coating slurry for the current collector of the lithium ion battery proposed by the present invention comprises the following steps:

[0042] S1. Add CMC and ethanol aqueous solution into the disperser according to the mass ratio of 5:95, control the temperature of the disperser to 25°C, and the rotational speed to 1800rmp, and disperse for 2 hours to obtain an anti-sedimentation dispersion; wherein, ethanol and water in the ethanol aqueous solution The volume ratio is 1:1;

[0043] S2. According to the mass percentage, take 20% anti-sedimentation dispersion liquid and 1% non-ionic fluorocarbon surfactant and add them to the disperser, keep the temperature of the disperser at 25°C and the speed of 1200rmp, disperse for 2 hours, and then add 1.5% graphite Alkene and 71.2% ethanol aqueous solution, wherein, the volume ratio of ethanol and water in the ethanol aqueous solution is 1:1, the rotational speed is 2800rmp, disperse for 2 hours, add 1....

Embodiment 3

[0046] The preparation method of the coating slurry for the current collector of the lithium ion battery proposed by the present invention comprises the following steps:

[0047] S1. Add CMC and isopropanol aqueous solution into the disperser at a mass ratio of 5:95, control the temperature of the disperser at 25°C, and the rotational speed at 1800rmp, and disperse for 3 hours to obtain an anti-sedimentation dispersion; among them, the isopropanol aqueous solution , the volume ratio of isopropanol to water is 1:1;

[0048] S2. According to the mass percentage, take 20% anti-sedimentation dispersion liquid and 1% non-ionic fluorocarbon surfactant and add it to the disperser, keep the temperature of the disperser at 25°C and the speed of 1200rmp, disperse for 2 hours, and then add 1% graphite Alkene and 69.8% isopropanol aqueous solution, wherein, in the isopropanol aqueous solution, the volume ratio of isopropanol to water is 1:1, disperse at 2800rmp for 2 hours, add 2% carbon ...

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Abstract

The invention discloses coating slurry for a current collector of a lithium ion battery as well as the current collector and a preparation method thereof. The coating slurry comprises the following raw materials in percentage by mass: 0.5% to 2% of graphene, 0.5% to 2% of a carbon nano tube, 1.2% to 2.5% of conductive carbon black, 10% to 45% of an anti-settling dispersion liquid, 3% to 5% of binding agent, 0.3% to 1% of a surfactant and 42.5% to 84.5% of a solvent. According to the coating slurry for the current collector of the lithium ion battery as well as the current collector and the preparation method thereof, the slurry is coated on the surface of a current collector material, so that a migration distance of active substances of positive and negative electrodes can be reduced, a battery interface is improved, the cycling and safety performance and the rate performance of the battery are improved, and meanwhile, the mass of the current collector can be reduced, the quality of the active substances is improved, and the energy density of the battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a coating slurry for a current collector of a lithium ion battery, a current collector and a preparation method thereof. Background technique [0002] In recent years, with the dual effects of human development's increasing demand for energy and the limitation of environmental resources, it is necessary to use as few resources as possible in lithium batteries to obtain greater battery energy density to develop electric vehicles. However, the interface contact performance of the positive and negative electrodes of the battery will directly affect the characteristics of the battery, such as the capacity, internal resistance, rate, cycle and self-discharge of the battery. At present, the current collector material of the positive and negative electrodes of lithium-ion batteries is usually high-purity porous aluminum (copper) foil, while the traditional positive and neg...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/80H01M10/0525
CPCY02E60/10
Inventor 倪江秀郑刚李晓俊杨茂萍樊少娟李格
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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