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Lithium battery positive plate and preparation method and application thereof

A lithium battery and positive electrode technology, which is applied in the field of lithium battery positive electrode and its preparation, can solve problems such as safety problems, the reduction of acupuncture pass rate of lithium batteries, melting and burning of binders, etc., so as to improve elasticity and improve mixing Uniformity, the effect of improving electrical properties

Inactive Publication Date: 2021-03-26
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode slurries disclosed in the above documents all use polyvinylidene fluoride as a binder, and the temperature of the main material of the positive electrode increases during the battery safety test, which may cause the binder to melt and burn, thereby causing safety problems; The acupuncture pass rate of

Method used

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  • Lithium battery positive plate and preparation method and application thereof
  • Lithium battery positive plate and preparation method and application thereof
  • Lithium battery positive plate and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Taking the mass of the active material layer as 100%, the composition of the active material layer on the positive electrode sheet of the lithium battery in this embodiment includes the following components:

[0046]

[0047] Among them, the main material of the positive electrode is NCM622, and the conductive agent is conductive graphite.

[0048] The molecular weight of the polyimide with the first molecular weight is 115,000; the molecular weight of the polyimide with the second molecular weight is 50,000.

Embodiment 2

[0050] Taking the mass of the active material layer as 100%, the composition of the active material layer on the positive electrode sheet of the lithium battery in this embodiment includes the following components:

[0051]

[0052] Among them, the main material of the positive electrode is NCM622, and the conductive agent is conductive graphite.

[0053] The molecular weight of the polyimide with the first molecular weight is 105,000; the molecular weight of the polyimide with the second molecular weight is 35,000.

Embodiment 3

[0055] Taking the mass of the active material layer as 100%, the composition of the active material layer on the positive electrode sheet of the lithium battery in this embodiment includes the following components:

[0056]

[0057] Among them, the main material of the positive electrode is NCM622, and the conductive agent is conductive graphite.

[0058] The molecular weight of the polyimide with the first molecular weight is 130,000; the molecular weight of the polyimide with the second molecular weight is 40,000.

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Abstract

The invention relates to a lithium battery positive plate as well as a preparation method and application thereof, polyimide with two molecular weights is adopted as a binder in the lithium battery positive plate, the first molecular weight is more than 100,000, and the second molecular weight is less than 600,000; the lithium battery positive plate provided by the invention adopts the adhesive with the components, so that the safety problem caused by the melting and combustion of the adhesive possibly caused by the temperature rise of a positive main material in a safety test is solved, the dispersion uniformity of the adhesive is improved, and the needling passing rate of a lithium battery obtained by the lithium battery positive plate is greatly improved.

Description

technical field [0001] The invention belongs to the field of lithium battery materials, and relates to a lithium battery positive plate, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have high energy density, high output power, are green and environmentally friendly, and do not contain toxic substances such as lead, cadmium, and mercury. They have broad application prospects in new energy vehicles and energy storage. At present, the binder used in the positive electrode sheet of lithium-ion batteries is mainly polyvinylidene fluoride, but polyvinylidene fluoride is a material with a low melting point (about 170 ° C), and the temperature rise of the main material of the positive electrode during the safety test may cause The binder melts and burns, which leads to safety problems; as a binder, polyimide has a melting point as high as 400°C, but it has problems such as poor dispersion and high viscosity during use. [0003] C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/622H01M10/0525H01M2004/028Y02E60/10
Inventor 陈英豪李跃飞徐悦斌何巍刘建华刘金成
Owner EVE ENERGY CO LTD
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