Coating liquid, current collector and preparation method of current collector

A technology of coating liquid and current collector, applied in the field of electrochemistry, can solve the problems of large interface resistance, limited contact area, rising internal resistance of batteries, etc., to improve water resistance and waterproof performance, improve surface adhesion, and improve stability. Effect

Inactive Publication Date: 2017-10-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a structural design has the following two defects: 1) The contact area between the rigid metal current collector and the active material particles is limited, and the interface resistance is large, which causes an increase in the internal resistance of the battery, which affects the performance of the electrochemical device. Negative impact; 2) The bonding strength of the binder is limited. During the continuous charging and discharging process, it is easy to cause the expansion and separation between the active material and the current collector, resulting in a further increase in the internal resistance of the battery, which makes the cycle life and the safety of the battery Performance suffers
This method also only solves the problem of firm adhesion between the coating and the metal collector, does not consider the electrochemical stability of the conductive coating, and ignores the effective combination and conductivity of the conductive coating and the upper electrode layer.

Method used

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  • Coating liquid, current collector and preparation method of current collector
  • Coating liquid, current collector and preparation method of current collector

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preparation example Construction

[0032] The present invention also provides a method for preparing the above-mentioned coating liquid, comprising: mixing 2 to 50 parts by weight of a binder, 0.5 to 20 parts by weight of a crosslinking agent, 50 to 95 parts by weight of a solvent and polydopamine nanoparticles After mixing and dispersing, a coating liquid is obtained. After mixing, preferably 20 to 90 parts by weight of a conductive material is further added.

[0033] The binder, cross-linking agent, solvent, polydopamine nanoparticles and conductive material are the same as those described above, and will not be repeated here. The dispersing method is a method well known to those skilled in the art, and there is no special limitation. In the present invention, one or more of high-speed dispersing machine, emulsifying machine, sand mill, colloid mill or ultrasonic is preferably used to carry out dispersion.

[0034]The present invention also provides a current collector, comprising a metal base and an active...

Embodiment 1

[0046] 1.1 Preparation of coating solution

[0047] 3.9 parts by weight of polydopamine nanoparticles, 30 parts by weight of binder carboxylated styrene-butadiene latex, 20 parts by weight of crosslinking agent phthalic anhydride and 80 parts by weight of solvent water are uniformly mixed, and then 60 parts by weight of conductive The material is nano-graphite, which is dispersed by a high-speed disperser, and finally the coating liquid is obtained.

[0048] 1.2 Metal film material processing

[0049] The aluminum foil is first cleaned with 10wt% hydrochloric acid solution, then rinsed with deionized water as a solvent, and then dried at a temperature of 150°C to remove impurities on the surface of the aluminum foil and form a uniform textured layer on the surface of the aluminum foil.

[0050] 1.3 Preparation of conductive coating

[0051] Apply the coating solution to the gravure printing method, use the roller to pull the cleaned aluminum foil at a speed of 80 m / min, so t...

Embodiment 2

[0056] 2.1 Preparation of coating solution

[0057] 2 parts by weight of polydopamine nanoparticles, 20 parts by weight of binder carboxylated styrene-butadiene latex, 10 parts by weight of crosslinking agent phthalic anhydride and 90 parts by weight of solvent water are uniformly mixed, and then 80 parts by weight of conductive The material is nano-graphite, which is dispersed by a high-speed disperser, and finally the coating liquid is obtained.

[0058] 2.2 Metal film material processing

[0059] The aluminum foil is first cleaned with 10wt% hydrochloric acid solution, then rinsed with deionized water as a solvent, and then dried at a temperature of 120°C to remove impurities on the surface of the aluminum foil and form a uniform textured layer on the surface of the aluminum foil.

[0060] 2.3 Preparation of conductive coating

[0061] Apply the coating solution to the gravure printing method, use the roller to pull the cleaned aluminum foil at a speed of 100 m / min, so th...

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Abstract

The invention provides a coating liquid. The coating liquid comprises polydopamine nanoparticles. Compared with the prior art, the coating liquid contains the polydopamine nanoparticles with rich -OH and -NH groups, the polydopamine nanoparticles can serve as crosslinking points to achieve effective crosslinking and curing of a coating, and the stability of the coating is improved; besides, introduction of the nanoparticles contributes to construction of a coating surface with a micro-nanostructure, the water-resistant and waterproof performance of the coating can be further improved, the coarseness of the coating surface is improved, and the surface adhesive force of following coatings on the coating surface is further increased.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a coating solution, a current collector and a preparation method thereof. Background technique [0002] In conventional electrochemical devices, the manufacturing process of battery pole pieces is to directly coat the active material slurry on the surface of the metal collector, and after drying, the active material is fixed on the surface of the collector through a binder. However, such a structural design has the following two defects: 1) The contact area between the rigid metal current collector and the active material particles is limited, and the interface resistance is large, which causes an increase in the internal resistance of the battery, which affects the performance of the electrochemical device. Negative impact; 2) The bonding strength of the binder is limited. During the continuous charging and discharging process, it is easy to cause the expans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D113/02C09D5/24C09D7/12H01M4/66
CPCC09D5/24C09D113/02H01M4/667C08L79/04C08K3/04Y02E60/10
Inventor 胡华胜刘福海
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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