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Manufacturing method for high-safety and high-capacity lithium ion battery

A lithium-ion battery, battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor safety performance, rate performance, low specific energy, etc., to improve electrical conductivity, improve specific energy, and improve safety. Effect

Inactive Publication Date: 2016-03-30
青岛星沃能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a method for manufacturing a high-safety, high-capacity lithium-ion battery, which solves the shortcomings of lithium-ion batteries such as poor safety performance, poor rate performance, and low specific energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add an appropriate amount of NMP to the ultrasonic disperser, and then add powdered PVDF to form a mixed solution with a PVDF mass concentration of 4%. The ultrasonic dispersion time of PVDF is 3 hours. After PVDF is completely dissolved in NMP, a glue is formed, and graphite is added. Graphene powder, the mass concentration of graphene powder in the glue is 1%, ultrasonically dispersed for 8 hours, after the solution is prepared, it is evenly coated on a 7 μm thick three-dimensional copper foil and a 12 μm thick three-dimensional aluminum foil with a coating machine. The single-sided thickness of the three-dimensional copper foil and the three-dimensional aluminum foil is 0.1 μm, the positive electrode active material is nickel cobalt lithium manganese oxide, the negative electrode active material is mesophase carbon microspheres (MCMB), and the separator is PP / PE / PP. The electrolyte is a commercially available finished product suitable for the nickel-cobalt lithium man...

Embodiment 2

[0032]Add an appropriate amount of NMP to the ultrasonic disperser, and then add powdered PVDF to form a mixed solution with a PVDF mass concentration of 5%. The ultrasonic dispersion time of PVDF is 3h. After the PVDF is completely dissolved in NMP, add the graphene powder , the mass concentration of graphene powder in the glue solution is 1.5%, ultrasonically dispersed for 8 hours, and the solution is uniformly coated on a 12 μm thick three-dimensional aluminum foil with a coating machine after the solution is prepared. Add an appropriate amount of deionized water to the ultrasonic disperser, and then add powdered CMC to form a CMC solution with a mass concentration of 1.2%. The ultrasonic dispersion time of CMC is 5h. After the CMC is completely dissolved in deionized water, the graphene powder The mass concentration of graphene powder in the glue is 1.5%, ultrasonically dispersed for 8h, and then SBR is added to form a mixed solution with a mass concentration of SBR of 2%, ...

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PUM

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Abstract

The invention provides a manufacturing method for a high-safety and high-capacity lithium ion battery. The manufacturing method comprises the steps of 1) preparation of a graphene glue solution: uniformly mixing graphene powder, a binder and solvent to obtain the graphene glue solution; 2) preparation of a three-dimensional current collector: covering the surface of the the-dimensional current collector with the graphene-containing glue solution, and baking by a drying oven; and 3) preparation of a battery: uniformly coating the three-dimensional current collector with a positive electrode material and a negative electrode material to obtain a battery pole piece, wherein the surface of the three-dimensional current collector is covered with the graphene; and performing subsequent assembling to obtain the battery. The lithium ion battery with high safety, high rate and high capacity is prepared by the manufacturing method provided by invention; and the shortcomings of low safety, poor rate capability and low specific energy of the lithium ion battery are overcome.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium ion batteries, in particular to a method for manufacturing lithium ion batteries with high safety and high capacity. Background technique [0002] Due to the advantages of high discharge platform, high energy density, long cycle life, and environmental protection, lithium-ion batteries have become a major player in the power supply market. With the gradual reduction of petroleum fuels, the increasing environmental pollution and the enhancement of people's awareness of environmental protection, people have gradually tried to use lithium-ion batteries in pure electric vehicles, hybrid electric vehicles and other fields. [0003] However, news of lithium-ion batteries catching fire and exploding continues to spread in the society, making consumers question the safety performance of lithium-ion batteries, and their cycle performance needs to be improved. In order to improve the safety p...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M4/70H01M10/0525
CPCH01M4/663H01M4/70H01M10/0525Y02E60/10
Inventor 赵长峰聂传凯
Owner 青岛星沃能源科技有限公司