Manufacturing method of negative plate of safety lithium-ion battery

A manufacturing method, lithium ion technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., to achieve high filling density, excellent charge and discharge performance, and good filling effect

Inactive Publication Date: 2017-02-22
HUBEI UEE ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In order to solve the above-mentioned safety problems in the existing lithium-ion battery field, the technology of the present invention does not expand the technical scope of lithium-ion battery manufacturing technology and does not change the traditional process flow of lithium-ion battery manufacturing. The purpose of the present invention is to provide A method for manufacturing a safe lithium-ion power battery negative electrode sheet. The invention uses a new type of graphite/activated carbon comp

Method used

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  • Manufacturing method of negative plate of safety lithium-ion battery
  • Manufacturing method of negative plate of safety lithium-ion battery
  • Manufacturing method of negative plate of safety lithium-ion battery

Examples

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Example Embodiment

[0052] Example 1:

[0053] A method for manufacturing the negative electrode sheet of a safe lithium ion battery, including the following steps and process conditions:

[0054] In the first step, the negative electrode active material graphite / activated carbon composite material: SP was mixed by ball milling at a mass ratio of 1:0.002 for 0.5 hours to obtain negative electrode active material mixture A; negative electrode additive graphene B; according to the mass ratio of A:B 1:0.005 ratio, ball mill for 4 hours to mix evenly to make negative active material mixture C;

[0055] In the second step, CMC, which accounts for 1% of the mass of the mixture C, is prepared with distilled water to prepare a 0.5% concentration by mass of an aqueous solution, which is kept constant at 30°C and stirred for 0.5 hours under vacuum, and SBR accounting for 2% of the C substance’s mass is added in 3 or 4 or 5 times. At the same time, add NMP solvent, which accounts for 1% of the mass of the water o...

Example Embodiment

[0060] Example 2:

[0061] A method for manufacturing the negative electrode sheet of a safe lithium ion battery, including the following steps and process conditions:

[0062] In the first step, the negative electrode active material graphite / activated carbon composite material: SP was mixed by ball milling at a mass ratio of 1:0.004 for 1 hour to obtain the negative electrode active material mixture A; the carbon nanotubes B according to the mass ratio of A:B were: The ratio of 1:0.004, ball milling for 1 hour to mix evenly to make negative active material mixture C;

[0063] In the second step, CMC which accounts for 2% of the mass of C is prepared with double-distilled water to form an aqueous solution with a concentration of 1% by mass percentage, which is kept constant at 35°C and stirred for 1 hour under vacuum. SBR accounts for 4% of the mass of C is added in 3 or 4 or 5 times. At the same time, add NMP which accounts for 2% of the water volume of the CMC solution, at a cons...

Example Embodiment

[0068] Example 3:

[0069] A method for manufacturing the negative electrode sheet of a safe lithium ion battery, including the following steps and process conditions:

[0070] In the first step, the graphite / activated carbon composite material: SP was mixed by ball milling at a mass ratio of 1:0.006 for 1.5 hours to obtain a negative electrode active material mixture A; a mixture of graphene and carbon nanotubes mixed in an equal mass ratio according to A:B The mass ratio of is: the ratio of 1:0.003, ball milled for 2 hours and mixed uniformly to make negative active material mixture C;

[0071] In the second step, CMC with 3% of C by mass is obtained in the first step, and purified water is used to prepare an aqueous solution with a concentration of 2.0% by mass, constant temperature at 40°C, and vacuum stirring for 2 hours. Add 3 or 4 or 5 times to account for 6 % SBR, and at the same time add NMP which accounts for 3% of the water volume of the CMC solution, at a constant temper...

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Abstract

The invention discloses a manufacturing method of a negative plate of a safety lithium-ion battery. The method comprises the steps of mixing a negative active material with a conductive agent at a certain mass ratio to obtain a mixture A; carrying out ball-milling and mixing on an additive B and the mixture A at a certain mass ratio to form a mixture C; preparing a certain mass percent of water solution from CMC which accounts for a certain mass ratio of the mixture C, carrying out constant-temperature stirring, adding an SBR which accounts for a certain mass ratio of the mixture C in batches, simultaneously adding an NMP which accounts for a certain ratio of the mixture C and carrying out constant-temperature stirring to form a sizing material D; adding the mixture C to the sizing material D in batches, controlling the solid content of the mixture C and stirring to obtain slurry; adding a proper amount of water, adjusting, controlling the viscosity and stirring to obtain negative slurry E; employing copper foil as a current collector F, intermittently coating a single side or double sides of the current collector F with the negative slurry E, reserving a certain current collector, carrying out drying, controlling the surface density, carrying out rolling and controlling the compactness and the thickness of the negative plate; and dividing, cutting, welding and pasting a tab adhesive tape to obtain the negative plate of the safety lithium-ion battery. The lithium-ion battery assembled by the negative plate has good electric cycle performance and safety performance.

Description

technical field [0001] The invention relates to the technical field of batteries, and more specifically relates to a method for manufacturing a safe lithium-ion battery negative electrode sheet. Background technique [0002] Lithium-ion batteries are mainly composed of positive and negative pole pieces, diaphragms, electrolytes, and battery casings (including stainless steel casings, plastic casings, and aluminum-plastic film flexible packaging, etc.). Among them, the negative electrode active materials for the manufacture of lithium-ion battery negative pole pieces are mainly "natural negative electrode graphite" or "modified graphite" or "artificial graphite", as well as carbon nanotubes, graphene, etc., the synthesis technology of graphite materials, the processing of materials And electrochemical performance, etc., relatively stable and mature. The source of natural graphite is also relatively abundant and thus the price is low, but it is also one of the key materials f...

Claims

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Application Information

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IPC IPC(8): H01M4/1393H01M4/04H01M4/587H01M10/0525
CPCH01M4/0404H01M4/1393H01M4/587H01M10/0525Y02E60/10
Inventor 林定文张文博舒方君丁先红周环波
Owner HUBEI UEE ENERGY TECH CO LTD
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