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Preparation method of positive current collector for lithium ion battery

A cathode current collector, lithium ion battery technology, applied in battery electrodes, electrode carriers/current collectors, circuits, etc., can solve problems such as limited effect, inability to improve lithium ion transmission speed of lithium batteries, and reduce battery internal resistance and polarization. , to achieve the effect of slow response, low internal resistance, and improved transmission speed

Active Publication Date: 2016-08-24
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method adopted in the above-mentioned patent is similar to the mainstream gravure printing method in the lithium battery industry. It is to coat a layer of conductive material on the current collector to improve the conductivity. This method can be used to make up for the lack of conductivity of the positive active material itself. , it can improve its conductivity to a certain extent, but it can only increase the transmission speed of electrons, but cannot increase the transmission speed of lithium ions inside the lithium battery, and has a limited effect on reducing the internal resistance and polarization of the battery.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method for a positive electrode current collector for a lithium ion battery, comprising the steps of:

[0025] A. Soak the aluminum foil (that is, the traditional positive current collector aluminum foil) in 3-aminopropyltrimethylsilane (SiRN) for 30 minutes to 60 minutes, and then take out the aluminum foil; in this step, the amino group is attached to the aluminum foil;

[0026] B. Soak the aluminum foil taken out in step A in the HCl solution with a concentration of 0.05mol / L for 30 minutes to 60 minutes, then take out the aluminum foil, wash it with water, and dry it; make the protons attach to the amino group, and complete the protonation of the amino group on the aluminum foil; this step Drying can be done with nitrogen flow to prevent oxidation;

[0027] C. Dip the dried aluminum foil in step B into a concentration of 5×10 -3 Soak in mol / L polystyrene sodium sulfonate (PSS) solution for 20-60 minutes, then take out the aluminum foil, wash it wit...

Embodiment 2

[0038] A preparation method of a positive electrode current collector for a lithium ion battery, the specific steps are as follows:

[0039] A. Soak the aluminum foil (that is, the traditional positive current collector aluminum foil) in 3-aminopropyltrimethylsilane (SiRN) for 40 minutes, and then take out the aluminum foil; in this step, the amino group is attached to the aluminum foil;

[0040] B. Soak the aluminum foil taken out in step A for 50 minutes in an HCl solution with a concentration of 0.05mol / L, then take out the aluminum foil, wash it with water, and dry it; make the protons attach to the amino group, and complete the protonation of the amino group on the aluminum foil; It can be blown dry with nitrogen flow to prevent oxidation;

[0041] C. Dip the dried aluminum foil in step B into a concentration of 5×10 -3mol / L polystyrene sodium sulfonate (PSS) solution soaked, keep 30 minutes, then take out the aluminum foil, wash, dry; form SiRN / PSS composite layer on...

Embodiment 3

[0046] A preparation method of a positive electrode current collector for a lithium ion battery, the specific steps are as follows:

[0047] A. Soak the aluminum foil (that is, the traditional positive current collector aluminum foil) in 3-aminopropyltrimethylsilane (SiRN) for 50 minutes, and then take out the aluminum foil; in this step, the amino group is attached to the aluminum foil;

[0048] B. Soak the aluminum foil taken out in step A for 40 minutes in an HCl solution with a concentration of 0.05mol / L, then take out the aluminum foil, wash it with water, and dry it; make the protons attach to the amino group, and complete the protonation of the amino group on the aluminum foil; It can be blown dry with nitrogen flow to prevent oxidation;

[0049] C. Dip the dried aluminum foil in step B into a concentration of 5×10 -3 mol / L polystyrene sodium sulfonate (PSS) solution soaked, keep 30 minutes, then take out the aluminum foil, wash, dry; form SiRN / PSS composite layer o...

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Abstract

The invention discloses a preparation method of a positive current collector for a lithium ion battery. The preparation method comprises the following steps of immersing an aluminum foil in 3-amino propyl trimethyl silane; taking out the aluminum foil, immersing the aluminum foil in an HC1 solution, taking out the aluminum foil, immersing the aluminum foil in a sodium polystyrenesulfonate solution, taking out the aluminum foil, immersing the aluminum foil in a conductive polymer monomer solution, taking out the aluminum foil, immersing the aluminum foil in a polyoxometallic acid lithium salt solution, taking out the aluminum foil, washing and drying the aluminum foil, and fabricating to the positive current collector. With the positive current collector prepared according to the method, the defect that only the electron transmission speed can be increased by a traditional intaglio printing method is made up, the internal resistance and the polarization of a lithium iron phosphate system battery are favorably reduced, and the electrical performance of the lithium iron phosphate battery is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a preparation method of a positive electrode current collector for lithium ion batteries. Background technique [0002] Lithium battery, as an effective energy conversion and energy storage device, has attracted much attention since its invention. Its characteristics of high working voltage, high energy density, high specific energy, high specific power, stable discharge, and no memory effect are widely used in Various electronic products. Although lithium batteries have achieved great success in 3C products, they are still in their infancy in the fields of power applications and energy storage. The key factor restricting their development is composite materials. At present, the cathode materials mainly used in the fields of power and energy storage are Lithium iron phosphate. Lithium iron phosphate power battery has been greatly developed in the field of electric veh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/64H01M4/66
CPCH01M4/48H01M4/64H01M4/666Y02E60/10
Inventor 廖小东谢皎王瑨
Owner 中国东方电气集团有限公司
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