Oily binder and application thereof

A binder and oil-based technology, applied in the field of battery materials, can solve the problems of uneven dispersion of water-based negative electrode slurry, low DC internal resistance, side reactions, and long cycle life of batteries, achieving good fast charging performance and improved energy density. , long cycle life effect
CN112002903AActive Publication Date: 2020-11-27HUBEI JINQUAN NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HUBEI JINQUAN NEW MATERIALS CO LTD
Publication Date
2020-11-27

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Abstract

The invention relates to an oily binder and application thereof. The oily binder comprises at least one of oily polyacrylic acid, oily polyacrylate, oily styrene acrylate, oily polyacrylonitrile, oilypolyacrylamide, oily polyimide and oily polyamideimide, and the molecular weight of the oily binder is selected from 5W-200W. The oily binder is used for replacing a traditional water-based binder tobe used for negative electrode slurry, and the problems that water-based negative electrode slurry is uneven in dispersion and large in number of coating particles, and the water-based binder floatsupwards and sticks to a roller in a cold pressing mode are effectively solved. Compared with a traditional water-based adhesive, a battery cell obtained by the oily adhesive has the characteristics oflow direct-current internal resistance, good quick-charge performance, small quick-charge temperature rise, few side reactions and long cycle life of the battery cell. Compared with oily polyvinylidene fluoride serving as a binder, the oily binder disclosed by the invention has the advantage that the obtained battery cell has higher energy density.
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Description

technical field

[0001] The invention belongs to the field of battery materials, and relates to an oily binder and its application. Background technique

[0002] Graphite and silicon-based materials are commonly used materials for battery negative electrodes, and are widely used in the field of power batteries and consumer batteries.

[0003] Graphite or silicon-based negative electrodes often use an aqueous system, in which pure water is used as a common solvent for negative electrode pulping. Water-based negative electrodes often have poor dispersion uniformity of the negative electrode slurry, and particles are prone to appear on the negative electrode sheet. The negative electrode binder styrene butadiene is easy to break when stirred, and the binder is prone to float during coating, resulting in a change in the adhesion of the electrode sheet. Poor, a series of problems such as cold-pressed pole pieces sticking to the roll. In addition, the DC internal resistance of th...

Claims

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