Lithium ion battery negative electrode single-side pre-lithiation method using three-dimensional foil

A lithium-ion battery, pre-lithiation technology, applied in the direction of battery electrodes, electrode manufacturing, electrode carrier/collector, etc., can solve the problems of silicon carbon/graphite electrode expansion and powder loss life, low capacity, etc., to achieve the required time for operation Effects of shortening, improving cycle life, and shortening time

Inactive Publication Date: 2018-09-18
TIANJIN ENERGIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of this, the present invention aims to propose a single-sided pre-lithiation method for lithium-ion battery negative electrodes using three-dimensional foils to solve the problems of silicon carbon / graphite electrode powder loss due to expansion, short life, and low capacity. Lithiation is simplified to single-sided pre-lithiation, which improves the efficiency of pre-lithiation

Method used

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  • Lithium ion battery negative electrode single-side pre-lithiation method using three-dimensional foil
  • Lithium ion battery negative electrode single-side pre-lithiation method using three-dimensional foil

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment one, silicon oxide, lithium metal powder, composite amount is at 0.6mg / cm2

[0037] 1) Using a double planetary mixer, according to the ratio of silicon oxide / graphite / conductive agent / binder = 7% / 83% / 5% / 5%, prepare negative electrode slurry;

[0038] 2) Using roller coating equipment, according to the single surface density of 12mg / cm2, the above-mentioned negative electrode slurry is coated on a three-dimensional current collector with circular holes with a diameter of 0.5mm, a hole ratio of 30%, and a thickness of 20μm, and rolled to 170μm ;

[0039] 3) using pre-lithiation composite equipment, coating 0.6mg / cm2 of lithium metal powder on the surface of the above-mentioned pole piece, that is, obtaining the negative electrode pole piece after pre-lithiation;

[0040] 4) Assemble the above-mentioned lithium metal powder-composited pole piece, positive electrode, and diaphragm, inject an appropriate amount of electrolyte solution after baking, and form it t...

Embodiment 2

[0042] Embodiment two, silicon oxide, lithium metal powder, composite amount is at 1.6mg / cm2

[0043] 1) Using a double planetary agitator, according to the ratio of silicon oxide / graphite / conductive agent / binder = 30% / 60% / 5% / 5%, prepare negative electrode slurry;

[0044] 2) Using roller coating equipment, according to the single surface density of 7.5mg / cm2, the above-mentioned negative electrode slurry is coated on a three-dimensional current collector with a circular hole in diameter of 0.5mm, a hole ratio of 30%, and a thickness of 20μm, and rolled to 127μm;

[0045]3) using pre-lithiation composite equipment, coating 1.6mg / cm2 of lithium metal powder on the surface of the above-mentioned pole piece to obtain the negative electrode pole piece after pre-lithiation;

[0046] 4) Assemble the above-mentioned lithium metal powder-composited pole piece, positive electrode, and diaphragm, inject an appropriate amount of electrolyte solution after baking, and form it to obtain a...

Embodiment 3

[0048] Embodiment three, silicon, lithium metal powder, composite amount is at 0.6mg / cm

[0049] 1) Using a double planetary mixer, according to the ratio of silicon / graphite / conductive agent / binder = 2.5% / 87.5% / 5% / 5%, prepare negative electrode slurry;

[0050] 2) Using roller coating equipment, according to the single surface density of 12mg / cm2, the above-mentioned negative electrode slurry is coated on a three-dimensional current collector with circular holes with a diameter of 0.5mm, a hole ratio of 30%, and a thickness of 20μm, and rolled to 170μm ;

[0051] 3) using pre-lithiation composite equipment, coating 0.6mg / cm2 of lithium metal powder on the surface of the above-mentioned pole piece, that is, obtaining the negative electrode pole piece after pre-lithiation;

[0052] 4) Assemble the above-mentioned lithium metal powder-composited pole piece, positive electrode, and diaphragm, inject an appropriate amount of electrolyte solution after baking, and form it to obtai...

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Abstract

The invention provides a lithium ion battery negative electrode single-side pre-lithiation method using a three-dimensional foil. The method comprises the following steps: 1, coating a three-dimensional current collector with a negative electrode slurry, and performing rolling to obtain a rolled electrode sheet; 2, performing pre-lithiation compounding on the electrode sheet: carrying the following two pre-lithiation processes according to the difference of lithium metal raw materials: uniformly spraying or coating one side of the rolled electrode sheet with lithium metal powder through a lithium metal powder pre-lithiation process or bonding and compounding one side of the rolled electrode sheet with a lithium foil under a certain pressure by adopting a lithium foil pre-lithiation process; and 3, assembling a positive electrode, a diaphragm and the negative electrode obtained after the pre-lithiation compounding is completed in order to form a battery cell, and performing electrolyteinjection and formation on the battery cell. The lithium ion battery negative electrode single-side pre-lithiation method using the three-dimensional foil solves the problems of swelling peeling, short life and low capacity of a silicon carbide/graphite electrode; and two-side pre-lithiation is simplified into single-side pre-lithiation, so the pre-lithiation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of pre-lithiation methods for lithium ion battery materials, and in particular relates to a single-side pre-lithiation method for lithium ion battery negative electrodes using a three-dimensional foil material. Background technique [0002] The market demand for the energy density of batteries is getting higher and higher, especially in the field of new energy vehicles. In order to solve the mileage anxiety of users, replacing graphite negative electrodes with silicon-carbon / graphite composite electrodes is one of the effective precautions to increase the energy density of batteries. [0003] Due to the intrinsic characteristics of silicon carbon materials, large volume expansion, low positive electrode capacity, and short life are the main technical difficulties restricting its large-scale application. [0004] (1) The high volume expansion ratio during charge and discharge causes silicon carbon / graphite el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/1393H01M4/1395H01M4/66H01M4/80
CPCH01M4/0409H01M4/0419H01M4/1393H01M4/1395H01M4/661H01M4/80Y02E60/10
Inventor 刘静高秀玲王驰伟
Owner TIANJIN ENERGIES
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