Silver conductive coating material of lithium ion battery, preparation method of silver conductive coating material and lithium ion battery

A lithium-ion battery, conductive coating technology, applied in conductive materials dispersed in non-conductive inorganic materials, battery electrodes, cable/conductor manufacturing, etc. problems, to achieve the effect of improving production efficiency, low internal resistance, and long service life

Inactive Publication Date: 2016-08-24
深圳宇锵新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the existing conductive coating is not weldable and cannot be used for tab welding, so the conductive coating still needs to be intermittently primed according to the size of the pole piece, which greatly reduces production efficiency

Method used

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  • Silver conductive coating material of lithium ion battery, preparation method of silver conductive coating material and lithium ion battery
  • Silver conductive coating material of lithium ion battery, preparation method of silver conductive coating material and lithium ion battery
  • Silver conductive coating material of lithium ion battery, preparation method of silver conductive coating material and lithium ion battery

Examples

Experimental program
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preparation example Construction

[0026] The preparation method of the conductive coating material of the above-mentioned lithium ion battery comprises the following steps: according to the proportion of each component in the above-mentioned conductive coating material, the conductive agent and the polyvinylpyrrolidone are sequentially added to the aqueous dispersion of the acrylonitrile multipolymer, and the mixture is stirred. Afterwards, grinding and dispersing are carried out for several times until the dispersion is uniform, so as to obtain the conductive coating material for the lithium ion battery.

[0027] In a preferred case, the preparation method further includes adding a chelating agent to the binder, stirring and chelating, dispersing in water, and then adding the conductive agent and polyvinylpyrrolidone in sequence according to the proportion of each component in the conductive coating material , further adding a defoaming agent and a preservative, after stirring, grinding and dispersing for seve...

Embodiment 1～7

[0033] (1) Add calcium hydroxide to the binder shown in Table 1 according to the composition and content of the conductive coating material in Table 1, stir and disperse in water after chelating for 24 hours, and then press the conductive coating material in Table 1. Component and content of layer material The conductive agent and polyvinylpyrrolidone are added to the aqueous dispersion of the chelated binder in turn, and after stirring for 1 hour (wherein, the stirring linear speed is 20m / s), and then pass through a ball mill. Grinding was carried out for 5 times until the dispersion was uniform, and the silver conductive coating materials of the lithium ion batteries of Examples 1-5 were obtained.

[0034] (2) According to the existing lithium ion battery manufacturing method, a lithium ion battery is manufactured, the difference is that a layer of silver conductive coating material is first coated on the positive electrode sheet and the negative electrode sheet current colle...

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Abstract

The invention provides a silver conductive coating material of a lithium ion battery. The conductive coating material comprises the following constituents by weight: 100 parts of conductive agent, 20-150 parts of binding agent, 0-30 parts of polyvinylpyrrolidone and 500-10,000 parts of water, wherein on the basis of 100 parts of conductive agent, graphite flakes account for 10-100 parts, conductive carbon black accounts for 1-50 parts, and a carbon nanotube accounts for 0-80 parts. The invention also provides a preparation method of the above silver conductive coating material and the lithium ion battery employing the conductive coating material. In the conductive coating material, different types of conductive agents are creatively used, and the paste stability can be improved; meanwhile, due to a synergistic effect of various conductive agents, the dynamic internal resistance increase of a battery core also can be further reduced, and the rate performance of the battery is improved; and moreover, a pole plate shows silver after a base coat of the conductive coating material is coated, the base conductive coating can be continuously achieved, and the requirements of various intermittent coating structured pole plates in different sizes are met.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, and more particularly, to a silver conductive coating material for lithium ion batteries, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the rapid development of the battery field, people's requirements for various power sources are getting higher and higher. Among them, lithium-ion batteries are widely used due to their high voltage, light weight, no memory effect, long cycle life and no environmental pollution. use. As a chemical power source, a lithium-ion battery mainly includes: a battery casing, a pole core sealed in the battery casing, and a non-aqueous electrolyte; wherein, the pole core includes a battery positive electrode sheet, a negative electrode sheet and a separator, and the positive electrode sheet is composed of The active material of the positive electrode sheet is mixed and stirred with the corresponding binder, dispersant and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/24H01B13/00H01M4/62H01M10/0525
CPCH01B1/24H01B13/00H01M4/625H01M10/0525Y02E60/10
Inventor 李科费伟征
Owner 深圳宇锵新材料有限公司
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