Lithium-ion battery electrode prepared by water-based binder

Abstract

The invention discloses a lithium-ion battery electrode prepared by a water-based binder. The lithium-ion battery electrode is prepared by coating an aluminum foil or copper foil with an electrode slurry, and the thickness is 50-300 [mu]m; a formula of the electrode slurry comprises 60.0-96.0 parts by weight of an active material, 1.0-20.0 parts by weight of a conductive agent, 1.0-7.5 parts by weight of a binder, 1.0-7.5 parts by weight of a thickener, and 30.0-400.0 parts by weight of a dispersion medium. The active material is selected from lithium iron phosphate, lithium manganate, lithiumcobaltate, graphite and lithium titanate; the binder is an acrylic acid / styrene / methyl acrylate / styrene block copolymer. The binder has extremely high adhesion with active material particles, and hasextremely high elasticity. At the same time, the liquid absorption rate of an electrolyte solution can be improved, the conduction velocity of lithium ions is accelerated, and the performance of thelithium-ion battery electrode is greatly improved.

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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