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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 composite negative electrode active material for lithium-ion batteries. The process technology is simple, the electrode structure is simple, the manufacturing cycle is short, and the energy consumption is low. Battery charge-discharge specific capacity, charge-discharge cycle life, especially the high-current, high-rate discharge performance of power lithium-ion batteries, can significantly enhance the working safety of lithium-ion batteries, and significantly reduce the safety risks of lithium-ion power batteries

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A method for manufacturing a safe lithium-ion battery negative plate, comprising the following steps and process conditions:

[0054] The first step is negative pole active material graphite / activated carbon composite material: SP presses the mass ratio of 1:0.002, and ball mill mixes 0.5 hour, obtains negative pole active material mixture A; With negative pole additive graphene B; According to the mass ratio of A:B is The ratio of 1:0.005 was ball milled for 4 hours and mixed evenly to make negative electrode active material mixture C;

[0055] In the second step, the CMC accounting for 1% of the mass of the mixture C is formulated with distilled water to form a 0.5% aqueous solution at a mass percentage concentration of 0.5% at a constant temperature of 30° C. and stirred in vacuum for 0.5 hours, adding 2% of the SBR accounting for the mass of the C substance in 3 or 4 or 5 times, At the same time, add NMP solvent accounting for 1% of the water mass of the CMC solutio...

Embodiment 2

[0061] A method for manufacturing a safe lithium-ion battery negative plate, comprising the following steps and process conditions:

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

[0063] In the second step, the CMC accounting for 2% of the mass of C is formulated with twice-distilled water to form a 1% aqueous solution with a concentration of 1% by mass, kept at a constant temperature of 35° C., and stirred in vacuum for 1 hour, and then added SBR accounting for 4% of the mass of C in 3 or 4 or 5 times. At the same time, add NMP accounting for 2% of the water content of the CMC solution, keep the temperatu...

Embodiment 3

[0069] A method for manufacturing a safe lithium-ion battery negative plate, comprising the following steps and process conditions:

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

[0071] The second step will account for the first step to obtain CMC with 3% of the mass of C, and use pure water to prepare an aqueous solution with a concentration of 2.0% by mass, keep the temperature at 40°C, and stir in vacuum for 2 hours, and add 6% of the mass of C in 3 or 4 or 5 times. % SBR, while adding NMP accounting for 3% of the water content of the CMC solution, 40 ° C constant temperature, vacuum stirring, 3 hour...

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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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