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Battery current collector and preparation method thereof
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A battery collection and fluid technology, applied in electrode current collector coating, battery electrode, electrode manufacturing, etc., can solve the problems of thin conductive coating, the inability to control the conductive paste by the tape roller, and the inability to form the thickness, etc.
Pending Publication Date: 2021-05-18
FOSHAN SINO SCI NANO TECH MATERIAL CO LTD
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Abstract
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Problems solved by technology
In the existing coatingmachine that coats the conductive paste on the metal foil, the belt roller cannot control the amount of the conductive paste coated on the metal foil, so the thickness of the conductive coating formed on the metal foil is generally If it is larger than 1 μm, it is impossible to form a thin conductive coating
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preparation example Construction
[0051] Correspondingly, the present invention also provides a method for preparing a battery current collector, comprising the following steps:
[0056] S13, adding the carbon nanotubes and the second part of the solvent into the mixed solution B to obtain a conductive paste.
[0057] In the present invention, the binder is first added to the first part of the solvent, and then the graphene and conductive carbon black are added to the mixed solution A formed by the binder and the solvent, so that the dispersibility of the graphene and the conductive carbon black can be improved, so that The conductive agent in the conductive paste is more u...
Embodiment 1
[0087] Preparation of conductive paste
[0088] 20% binder and 42.42% water are mixed uniformly to obtain mixed solution A; 6% graphene and 2.8% conductive carbon black are added in mixed solution A and stirred evenly to obtain mixed solution B; 0.5% carbon nanotube and The remaining water was added to the mixed solution B to obtain a conductive paste.
[0089] The coating machine and iron removing device of the present invention are used to coat the conductive paste on both sides of the metal foil to form a conductive coating with a thickness of 300 nm on one side.
Embodiment 2
[0091] Preparation of conductive paste
[0092] 25% binder and 41.34% water were mixed uniformly to obtain mixed solution A; 6.5% graphene and 3.3% conductive carbon black were added in mixed solution A and stirred evenly to obtain mixed solution B; 0.6% carbon nanotube and The remaining water was added to the mixed solution B to obtain a conductive paste.
[0093] The coating machine and iron removing device of the present invention are used to coat the conductive paste on both sides of the metal foil to form a conductive coating with a thickness of 250 nm on one side.
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Abstract
The invention discloses a battery current collector and a preparation method thereof, the battery current collector comprises a metal foil and a conductive coating, the conductive coating is formed by coating the surface of the metal foil with conductive slurry, the thickness of the conductive coating is less than or equal to 300 nm, and the conductive slurry comprises graphene, conductive carbon black, carbon nanotubes, a binder and a solvent. According to the conductive coating disclosed by the invention, through reasonable proportioning, the binding power of an active substance and the current collector is improved, the dosage of a binding agent in the active substance is reduced, and the energy density and the cycle life of the battery are improved; the interface resistance of the current collector and the internal resistance of the battery are reduced.
Description
technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a battery current collector and a preparation method thereof. Background technique [0002] Secondary batteries are represented by lithium-ion batteries. Due to their excellent comprehensive performance, they have always occupied an important position in the field of 3C consumption, new energy power batteries and large-scale energy storage batteries. [0003] The current collector of secondary batteries such as lithium-ion batteries refers to the structure or parts that collect current. In lithium-ion batteries, it mainly refers to metal foils, such as copper foil and aluminum foil. The general term can also include polar ears. Its function is mainly to gather the current generated by the active material of the battery to form a larger current output, so the current collector should be in full contact with the active material, and the internal resistance should be as...
Claims
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Application Information
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