Preparation method of conductive glue solution for negative electrode of lithium ion battery

A lithium-ion battery and conductive adhesive technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that the dispersion effect affects the battery capacity, battery consistency, poor dispersion of conductive agents and binders, and easy agglomeration. To achieve the effect of improving the dispersion effect, facilitating swelling and avoiding agglomeration

Inactive Publication Date: 2018-09-28
CALB CO LTD
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  • Abstract
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Problems solved by technology

Among them, the conductive agent generally uses nanoparticles with good performance, which generally have a large specific surface area and super high surface energy, but the conductive agent is prone to agglomeration in the process of mixing with the active material, and the dispersion effect is poor, while the active material The quality of the dispersion effect with the conductive agent can directly affect the size of the battery capacity and the consistency of the battery
[0004] The problem of poor dispersion of conductive agent and binder in traditional lithium-ion battery negative electrodes and low pulping efficiency

Method used

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  • Preparation method of conductive glue solution for negative electrode of lithium ion battery
  • Preparation method of conductive glue solution for negative electrode of lithium ion battery

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Effect test

Embodiment 1

[0033] In the process of making the conductive glue, the present invention uses carbon nanotubes and SuperP as conductive agents, sodium carboxymethyl cellulose as a thickener, and N-methylpyrrolidone as a cosolvent, and the components are according to the mass ratio of carbon nanotubes: SuperP: sodium carboxymethyl cellulose: N-methylpyrrolidone: water = 1:2:6:36:405 mass ratio for mixing to obtain a solid content of the final conductive adhesive of 2%. Concrete preparation process is as follows:

[0034] (1) First add 50% sodium carboxymethyl cellulose powder into the mixer, then add conductive agent carbon nanotubes and SuperP, and finally put in the remaining sodium carboxymethyl cellulose powder, start stirring, and stir for revolution The speed is 8rpm, and the stirring time is 10min;

[0035] (2) Add N-methylpyrrolidone solution equivalent to 4 times the weight of the powder to the mixed powder, start stirring, the revolution speed of stirring is 10rpm, the dispersion ...

Embodiment 2

[0041] In the process of making the conductive glue in the present invention, KS-6 and SuperP are used as conductive agents, sodium carboxymethyl cellulose is used as a thickener, and N-methylpyrrolidone is used as a cosolvent, and the mass ratio of each component is KS-6: SuperP: sodium carboxymethyl cellulose: N-methylpyrrolidone: water = 1:2:6:54:297 mass ratio for mixing to obtain a solid content of 2.5% of the final conductive adhesive. Concrete preparation process is as follows:

[0042] (1) First add 50% sodium carboxymethyl cellulose powder into the mixer, then add conductive agent KS-6 and SuperP, and finally put in the remaining sodium carboxymethyl cellulose powder, start stirring, and stir for revolution The speed is 5rpm, and the stirring time is 15min;

[0043] (2) Add N-methylpyrrolidone solution equivalent to 6 times the weight of the powder to the mixed powder, start stirring, the revolution speed of stirring is 12rpm, the dispersion speed is 300rpm, and the ...

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Abstract

The invention belongs to the technical field of production of slurry of a lithium ion battery, particularly relates to a preparation method of conductive glue solution for a negative electrode of a lithium ion battery. The conductive glue solution contains sodium carboxymethylcellulose, N-methyl pyrrolidone and conductive agent, the constituents above are dissolved in deionized water according toproportion, and then the conductive glue solution of certain solid content is obtained; the N-methyl pyrrolidone is firstly premixed with sodium carboxymethylcellulose powder and conductive agent powder, thus, aggregation of small particles of the conductive agent caused by moisture absorption is avoided, and dispersion effect of the conductive agent is improved.

Description

technical field [0001] The invention belongs to the technical field of slurry production of lithium ion batteries, and in particular relates to a preparation method of conductive glue for negative electrodes of lithium ion batteries. Background technique [0002] Lithium batteries have many advantages such as large specific capacity, long charge and discharge life, no memory effect, and low environmental pollution. Since commercialization, they have quickly replaced nickel-chromium and nickel-metal hydride batteries and are widely used in mobile phones, notebook computers, and cameras. and other portable appliances. And there is a tendency to develop into new fields such as electric vehicles, aerospace, and energy storage power stations. Compared with traditional 3C digital batteries, these new fields have more stringent requirements for lithium-ion batteries, especially higher requirements for battery cycle life, energy density, consistency of battery packs, and safety. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/62H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 王云辉孙青山李松鞠赵博
Owner CALB CO LTD
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