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Binding agent and lithium ion battery

A lithium-ion battery and binder technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high brittleness, fragmentation, and poor adhesion with aluminum foil, and achieve improved flexibility and adhesion. The effect of binding force and reducing impact

Inactive Publication Date: 2017-01-04
OPTIMUM BATTERY CO LTD
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AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a binder and a lithium-ion battery, aiming to solve the problem of low flexibility of PVDF when PVDF is used as binder in the prior art, making its adhesion with aluminum foil Poor, resulting in high brittleness of the pole piece, resulting in problems such as peeling, burrs, and fragments during rolling, vermicelli, cutting, and winding, which seriously affect the technical problems of battery production and performance

Method used

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  • Binding agent and lithium ion battery

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Embodiment Construction

[0023] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0024] When PVDF is used as a binder in the prior art, due to the low flexibility of PVDF, its adhesion with aluminum foil is poor, resulting in high brittleness of the pole piece, resulting in roll pressing, vermicelli, cutting pieces and rolls. Problems such as peeling, burrs, and fragments appear during the winding process, which seriously...

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Abstract

The invention discloses a binding agent and a lithium ion battery. The binding agent is copolymerization-modified PVDF, a structure unit shown in a formula III is included in a main chain of the binding agent, acid / ester functional groups are included on molecular chains and can easily interact with oxidation functional groups on the surface of aluminum foil to form the hydrogen-bond interaction, the flexibility and binding force of the binding agent are improved, and the influences on manufacturing and performance of batteries are relieved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a binder and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, high working voltage, long cycle life, and no memory effect, and are widely used in new energy vehicle battery equipment. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators and electrolytes. The negative electrodes are usually made of natural graphite or artificial graphite as the active material, sodium carboxymethyl cellulose (CMC) is used as a dispersant, and styrene-butadiene rubber (SBR ) is the binder. In the positive electrode, the commonly used active material is lithium cobaltate (LiCoO2), conductive carbon is used as the conductive agent, and polyvinylidene fluoride (PVDF) is used as the binder. [0003] PVDF resin refers to a vinylidene fluoride polymer or a copolymer with a smal...

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M10/0525Y02E60/10
Inventor 张礼芳王海涛许辉
Owner OPTIMUM BATTERY CO LTD
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