High-capacity lithium battery and preparation method thereof

A lithium battery, high-capacity technology, applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of poor cycle performance of lithium batteries

Inactive Publication Date: 2022-05-13
江苏亿多力新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium batteries are prepared with lithium manganate as the positive electrode. Although they have a high capacity, the cycleability of the lithium battery is poor; theref

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A preparation method of a high-capacity lithium battery, the preparation method of the high-capacity lithium battery is:

[0030] (1) Mix lithium manganate and graphite in a ball milling tank at a mass ratio of 8:2. Under a nitrogen atmosphere, the ratio of material to ball is 1:15. Ball milling is carried out at a speed of 100 rpm for 3 to 5 hours. After passing through a 300-mesh sieve, add carboxymethyl cellulose with 0.1 times the mass of lithium manganate and absolute ethanol with 0.1 times the mass of lithium manganate, and stir evenly to make a positive electrode slurry; apply the positive electrode slurry on a surface with a thickness of 16 μm The front and back sides of the graphene-coated aluminum foil, the thickness of the graphene layer is 2 μm, then dried at 100 ° C, rolled under a pressure of 1.6 MPa and cut on a slitting machine to obtain a positive electrode;

[0031](2) Mix naphthalene and tetrahydrofuran in a mass ratio of 1:8 under a nitrogen atmosphe...

Embodiment 2

[0035] A preparation method of a high-capacity lithium battery, the preparation method of the high-capacity lithium battery is:

[0036] (1) Lithium manganate and graphite are mixed in a ball mill tank at a mass ratio of 8:2. Under a nitrogen atmosphere, the ratio of material to ball is 1:25. Ball milling is carried out at a speed of 150 rpm for 4 hours. After ball milling, 300 mesh sieve, then add carboxymethyl cellulose with 0.25 times the mass of lithium manganate and absolute ethanol with 0.2 times the mass of lithium manganate, and stir evenly to make positive electrode slurry; apply the positive electrode slurry to a coating with a thickness of 18 μm The graphene layer aluminum foil has both front and back sides, and the graphene layer thickness is 2 μm, then dried at 110 ° C, rolled under a pressure of 1.8 MPa and cut on a slitting machine to obtain a positive electrode;

[0037] (2) Mix naphthalene and tetrahydrofuran in a mass ratio of 1:9 under a nitrogen atmosphere,...

Embodiment 3

[0041] A preparation method of a high-capacity lithium battery, the preparation method of the high-capacity lithium battery is:

[0042] (1) Mix lithium manganate and carbon black in a ball milling tank at a mass ratio of 9:1. Under a nitrogen atmosphere, the ratio of material to ball is 1:30. Ball milling is carried out at a speed of 300 rpm for 5 hours. After ball milling Pass through a 300-mesh sieve, then add carboxymethyl cellulose with 0.4 times the mass of lithium manganate and absolute ethanol with 0.3 times the mass of lithium manganate, and stir evenly to make a positive electrode slurry; apply the positive electrode slurry on a 20 μm thick The front and back sides of the graphene-coated aluminum foil, the thickness of the graphene layer is 2 μm, then dried at 120 ° C, rolled under a pressure of 2 MPa and cut on a slitting machine to obtain a positive electrode;

[0043] (2) Under a nitrogen atmosphere, mix naphthalene and tetrahydrofuran at a mass ratio of 1:10, add...

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PUM

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Abstract

The invention discloses a high-capacity lithium battery and a preparation method thereof, and relates to the technical field of lithium batteries. According to the prepared high-capacity lithium battery, lithium manganate serves as a positive electrode material, artificial graphite serves as a negative electrode material, a modified cyanate ester film serves as a diaphragm, carbonic ester mixed liquor and lithium hexafluorophosphate serve as electrolyte, and a self-made additive and a film-forming agent are added; due to an interpenetrating cross-linked network in the modified cyanate ester film, the rigid tensile strength of the cyanate ester resin after copolymerization is reduced, the liquid retention property is enhanced, the cyclicity of the lithium battery is improved, and the service life of the lithium battery is prolonged; the self-made additive is double-amino-terminated silicon-containing cyclophosphazene, so that the heat resistance of the electrolyte is improved, the capacitance loss can be reduced, and the cyclicity of the lithium battery is ensured.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a high-capacity lithium battery and a preparation method thereof. Background technique [0002] Lithium batteries have become the most widely used secondary batteries in the world today because of their high energy density, long cycle life, and no memory effect. With the further development of lithium battery research, the development of battery materials with high capacity, high rate performance and long cycle life has become the focus of this field. [0003] The main structural components of lithium batteries are positive electrode, negative electrode, diaphragm and electrolyte, in which the electrolyte plays the role of conducting lithium ions, and its performance will ultimately affect the cycle life, coulombic efficiency, safety, energy density and power density of the battery. . Lithium batteries are prepared with lithium manganate as the positive electrode. Alt...

Claims

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Application Information

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IPC IPC(8): H01M50/414H01M4/505H01M10/0525H01M10/0567H01M10/058H01M10/42H01M50/44D01F6/78C08G77/388C08G77/395
CPCH01M50/414H01M50/44H01M10/0567H01M10/4235H01M10/0525H01M10/058H01M4/505D01F6/78C08G77/388C08G77/395Y02P70/50
Inventor 王丽伟
Owner 江苏亿多力新能源科技有限公司
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