Paper current collector, preparation method thereof, electrode and battery

Abstract

The invention is applicable to the technical field of batteries, and provides a paper current collector, a preparation method thereof, an electrode and a battery. The paper current collector comprisesa multi-layer structure fiber layer, a metal plating layer and a carbon substrate coating. The multi-layer structure fiber layer comprises at least one nano cellulose raw paper layer, and the two sides of the nano cellulose raw paper layer are both provided with a composite paper coating; the metal plating layer is arranged on one side, far away from the nano cellulose base paper layer, of the composite paper coating; the carbon substrate coating is arranged on one side, far away from the composite paper coating, of the metal plating layer; the composite paper coating comprises nano cellulose, an inorganic filler and a nano rubber additive. The composite paper coating is arranged on the two sides of the nano cellulose raw paper layer so that the nano cellulose raw paper layer has good strength and waterproof performance. In addition, the lithium ion battery prepared from the paper current collector has relatively high weight energy density and relatively high safety performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a paper current collector, a preparation method thereof, an electrode and a battery. Background technique [0002] At present, the current collectors of lithium-ion batteries generally use copper foil and aluminum foil. From the perspective of the current-carrying capacity requirements of the current collector during the charging and discharging current of lithium-ion batteries, although the thickness of copper and aluminum foil can meet the requirements, the current application is the most The thickness of the thinnest aluminum foil is 10μm, and the thickness of the thinnest copper foil is 6μm. It is mainly affected by the processing ability of the copper and aluminum foil itself and the difficulty of the manufacturing process of the pole piece. It is difficult to further reduce the thickness of pure copper foil and aluminum foil. [0003] In addition, due to the h...

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Problems solved by technology

[0002] At present, the current collectors of lithium-ion batteries generally use copper foil and aluminum foil. From the perspective of the current-carrying capacity requirements of the current collector during the charging and discharging current of lithium-ion batteries, although the thickness of copper and aluminum foil can meet the requirements, the current application is the most The thickness of the thinnest aluminum foil is 10μm, and the thickness of the thinnest copper foil is 6μm. It is mainly affected by the processing ability of the copper and aluminum foil itself and the difficulty of the manufacturing process of the pole piece. It is difficult to further reduce the thickness of pure copper foil and aluminum foil.

[0003] In addition, due to the high density of copper foil and aluminum foil, especially copper foil, its current collector accounts for about 8% of the weight of the battery, and the impact on the weight energy density of the battery cannot be ignored. Therefore, lithium-ion batteries made using traditional current collectors There is a problem of low security performance

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