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Production method of electrochemical active pole piece

A technology for active pole pieces and manufacturing methods, which is applied to battery electrodes, electrode carriers/collectors, circuits, etc., can solve problems such as weak power performance of lithium-ion batteries, improve battery rate charge and discharge capabilities and cycle life, and reduce battery life. Internal resistance, effect of improving tensile strength

Inactive Publication Date: 2013-08-14
谭彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the structure of the electrode material and the performance of the electrolyte, the power performance of lithium-ion batteries is relatively weak, especially for power lithium-ion batteries.
Therefore, how to improve the power density of lithium-ion batteries and further increase their energy density is a hot topic in current research, but it is also a difficult point.

Method used

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  • Production method of electrochemical active pole piece
  • Production method of electrochemical active pole piece
  • Production method of electrochemical active pole piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put the aluminum foil current collector with ordered three-dimensional square holes and regular arrangement of round holes in an ultrasonic tank for cleaning for 15 minutes, and dry it for later use. Then, weigh lithium iron phosphate, carbon black, polyvinylidene fluoride, and N-methyl-2-pyrrolidone according to the ratio of 100, 0.5, 3, and 125, and add them to the uniformly dispersed 1% graphene suspension in turn, Ultrasonic dispersion for 30 minutes, followed by high-speed shearing for 30 minutes to form a slurry, and then ball milling for 15 minutes to obtain a uniformly dispersed graphene / active material composite electrode slurry. Next, the above-mentioned composite electrode slurry is coated on a clean current collector with a three-dimensional square hole structure, and dried by infrared. Then, a porous film layer was coated on both sides of the active pole piece, and then rolled into a 360mm×180mm×2mm pole piece sample for lithium ion batteries.

[0031] fi...

Embodiment 2

[0033] The aluminum foil current collector with an ordered three-dimensional square hole structure was placed in an ultrasonic bath for cleaning for 15 minutes, and dried for later use. Then, weigh lithium iron phosphate, carbon black, polyvinylidene fluoride, and N-methyl-2-pyrrolidone in proportions of 100, 1.5, 3, and 130, and add them successively to a uniformly dispersed 0.5% graphene suspension, Ultrasonic dispersion for 30 minutes, followed by high-speed shearing for 30 minutes to form a slurry, and then ball milling for 15 minutes to obtain a uniformly dispersed graphene / active material composite electrode slurry. Next, the above-mentioned composite electrode slurry is coated on a clean current collector with a three-dimensional square hole structure, and dried by infrared. Then, a porous film layer was coated on both sides of the active pole piece, and then rolled into a 360mm×180mm×2mm pole piece sample for lithium ion batteries.

Embodiment 3

[0035] The aluminum foil current collector with an ordered three-dimensional circular hole structure was placed in an ultrasonic tank for cleaning for 15 minutes, and dried for later use. Then, weigh lithium iron phosphate, carbon black, polyvinylidene fluoride, and N-methyl-2-pyrrolidone according to the ratio of 100, 1, 3, and 125, and add them to the uniformly dispersed 1% graphene suspension in turn, Ultrasonic dispersion for 30 minutes, followed by high-speed shearing for 30 minutes to form a slurry, and then ball milling for 15 minutes to obtain a uniformly dispersed graphene / active material composite electrode slurry. Next, the above-mentioned composite electrode slurry is coated on a clean current collector with a three-dimensional square hole structure, and dried by infrared. Then, a porous film layer was coated on both sides of the active pole piece, and then rolled into a 360mm×180mm×2mm pole piece sample for lithium ion batteries.

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Abstract

The invention relates to a production method of an electrochemical active pole piece, and in particular relates to a production method of an electrochemical active pole piece suitable for a lithium ion battery. The electrochemical active pole piece comprises a current collector with an ordered three-dimensional hole structure, an electrode active material and an insulation diaphragm, wherein a, the current collector can be filled and coated with more electrode active materials; b, the electrode active material is filled and coated on the current collector and forms a space network structure with the three-dimensional hole of the current collector; and c, the insulation diaphragm covers two sides of the active pole piece, the tensile strength of the pole piece can be improved, and the active material can be effectively protected. According to the electrochemical pole piece which is prepared by the production method, not only can the conductivity and the heat radiation property of the electrode be remarkably improved, but also the surface density of the electrode material and the strength of the pole piece can be obviously improved, the energy density, and the multiplying charging and discharging capacities of a finished product lithium-ion battery can be improved, and the cycling service life of the finished product lithium-ion battery can be prolonged.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a method for preparing an electrochemically active pole piece suitable for the lithium ion battery. Background technique [0002] Since the first commercial lithium-ion battery products were launched in 1991, the development of lithium-ion batteries has a history of 20 years. Compared with other types of batteries, lithium-ion batteries have the advantages of high open circuit voltage, long cycle life, high energy density, low self-discharge, and environmental friendliness. At present, lithium-ion batteries have been widely used in portable digital products such as mobile phones, cameras, and notebook computers. [0003] At present, under the background of vigorously advocating green energy, in order to adapt to the development of electric vehicles and energy storage fields, it is necessary to develop lithium-ion batteries with higher energy density, power density, cycle times and safety...

Claims

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Application Information

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IPC IPC(8): H01M4/80H01M4/62H01M4/139
CPCY02E60/122Y02E60/10
Inventor 谭彬
Owner 谭彬
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