Lithium-ion battery electrode prepared by a water-based binder

Abstract

The invention discloses a lithium ion battery electrode prepared by a water-based binder, which is prepared by coating an electrode slurry on an aluminum foil or a copper foil, the thickness of which is between 50-300 microns, and the thickness of the electrode slurry is The formula is: 60.0-96.0 parts by weight of active material, 1.0-20.0 parts by weight of conductive agent, 1.0-7.5 parts by weight of binder, 1.0-7.5 parts by weight of thickener, and 30.0-400.0 parts by weight of dispersion medium; the active material is selected from From lithium iron phosphate, lithium manganate, lithium cobaltate, graphite, lithium titanate, the binder is acrylic acid / styrene / methyl acrylate / styrene block copolymer. The binder has a very high bonding effect with the active material particles, and has a very high elasticity. At the same time, it can increase the liquid absorption rate of the electrolyte, accelerate the lithium ion conduction rate, and greatly improve the performance of the lithium ion battery electrode.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery electrode prepared by a water-based binder. Background technique [0002] Lithium batteries are widely used in electric vehicles, portable electronic products and other fields due to their advantages such as high specific capacity, long cycle life, and small self-discharge. However, there are still problems such as short mileage and long charging time of electric vehicles on a single charge; insufficient endurance of portable electronic products and too fast capacity decay. It is urgent to further improve the specific capacity, energy density, and cycle life of lithium batteries. [0003] The electrodes of lithium-ion batteries are mainly composed of active materials, conductive agents and binders. At present, the binders used in actual production are mostly homopolymers or random copolymers, such as polyvinylidene fluoride (PVDF), sodium carboxymethyl ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problem that polyvinylidene fluoride cannot be used as a high specific capacity electrode binder in the prior art, the present invention proposes a lithium-ion battery electrode prepared by a water-based binder. The lithium-ion battery electrode uses a new type of water The base binder can improve the bonding force and elasticity at the same time, and at the same time, it can increase the liquid absorption rate of the electrolyte, accelerate the lithium ion conduction rate, and maintain the excellent performance of the lithium ion battery electrode.

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