Lithium ion battery composite pole piece, preparation method thereof and lithium ion battery

A lithium-ion battery and battery pole piece technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as battery temperature rise, inability to efficiently ensure battery safety, etc., and achieve low hardness and reduced Process loss, the effect of suppressing further increase

Active Publication Date: 2015-12-02
CALB CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure physical properties cannot prevent the battery temperature from rising further, and cannot effectively guarantee the safety of the battery.

Method used

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  • Lithium ion battery composite pole piece, preparation method thereof and lithium ion battery
  • Lithium ion battery composite pole piece, preparation method thereof and lithium ion battery
  • Lithium ion battery composite pole piece, preparation method thereof and lithium ion battery

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preparation example Construction

[0025] The present invention has no special limitation on the preparation method of the positive electrode of the battery, and the preparation method of the positive electrode of the battery known to those skilled in the art will suffice. In the present invention, it is preferably prepared according to the following method:

[0026] a1) dispersing the active material, conductive agent and binder of the positive electrode of the battery in a solvent to obtain a positive electrode slurry;

[0027] b1) coating the positive electrode slurry on the positive electrode current collector, and rolling after drying to obtain the positive electrode of the battery.

[0028] In the present invention, firstly, the active material, conductive agent and binder of the positive electrode of the battery are dispersed in a solvent to obtain positive electrode slurry. Wherein, the present invention has no special limitation on the types of the conductive agent and the binder, and the conductive a...

Embodiment 1

[0087] a Preparation of positive electrode sheet

[0088] The active material LiFePO was added to the solvent deionized water with a mass fraction of 93 wt%. 4 , 3.5wt% conductive agent carbon black and 3.5wt% binder LA132, mixed uniformly to obtain a ternary positive electrode slurry, and the positive electrode slurry was uniformly coated on a positive electrode current collector Al foil with a thickness of 20 μm, and dried to obtain Positive electrode, rolled for standby.

[0089] b preparation of mixed slurry;

[0090] Accurately weigh melamine cyanurate (MCA) and polyvinylidene fluoride film (PVDF) according to the mass ratio of 97:3. On a high-speed disperser, MCA and PVDF were uniformly dispersed in the solvent N-methylpyrrolidone (NMP) to obtain MCA slurry and PVDF slurry, and then the two slurries were stirred evenly, and the solvent NMP was used to control the concentration in the slurry. The solid content was 50 wt%, and a mixed slurry was obtained.

[0091] Prep...

Embodiment 2

[0099] a Preparation of positive electrode sheet

[0100] The active material LiFePO was added to the solvent deionized water with a mass fraction of 93 wt%. 4 , 3.5wt% conductive agent carbon black and 3.5wt% binder LA132, mixed uniformly to obtain a ternary positive electrode slurry, and the positive electrode slurry was uniformly coated on a positive electrode current collector Al foil with a thickness of 20 μm, and dried to obtain Positive electrode, rolled for standby.

[0101] b Preparation of negative electrode sheet

[0102] Add mass fraction to solvent deionized water and be respectively 95wt% negative active material graphite powder, 2wt% conductive agent KS-6, 1wt% thickener CMC (sodium carboxymethyl cellulose) and 2wt% binding agent SBR (styrene-butadiene rubber) was mixed evenly to obtain negative electrode slurry, and the negative electrode slurry was uniformly coated on a negative electrode current collector Cu foil with a thickness of 10 μm, dried to obtain a...

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Abstract

The invention provides a lithium ion battery composite pole piece. The lithium battery composite pole piece comprises battery pole pieces and functional coatings composited on surfaces of the battery pole pieces, wherein the functional coatings are prepared from functional substances and adhesives, the functional substances comprise one or more of a phosphorous compound, a nitrogenous compound and inorganic silicon compounds, and the battery pole pieces are a battery positive pole and/or a battery negative pole. According to the lithium ion battery composite pole piece, the functional coating is applied to the surface of each battery pole piece, can quickly absorb excess heat of the battery when the temperature of a lithium ion battery rises and responds to a chemical reaction spontaneously as reaction entropy to form a protective coating on the surface of the corresponding battery pole piece; on one hand, the temperature of the battery can be effectively prevented from rising continuously, on the other hand, active layers on the battery positive and negative poles can be deactivated, potential safety hazards of the battery can be controlled fundamentally, and the safety of the battery is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery composite pole piece, a preparation method thereof, and a lithium-ion battery. Background technique [0002] In order to improve the cruising range of electric vehicles and meet the practical needs of the society, the development and design of lithium-ion batteries with high energy density has become an inevitable trend in the lithium battery industry. However, high-energy lithium-ion batteries are prone to safety accidents such as explosion or fire when they are abused (acupuncture, extrusion, short circuit, overcharge, etc.), so the safety design of lithium-ion batteries will face greater challenges . [0003] How to improve the safety of lithium-ion batteries is a technical problem to be solved urgently in the lithium-ion battery industry. The main problem that causes the safety hazard of lithium-ion batteries is the irreversib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M4/139H01M10/0525H01M50/414H01M50/417H01M50/426H01M50/449H01M50/489
CPCH01M4/139H01M4/362H01M4/62H01M4/622H01M10/0525H01M50/449H01M50/414H01M50/417H01M50/426H01M50/489H01M4/13H01M4/366H01M10/052H01M10/4235Y02E60/10H01M50/446
Inventor 肖亚洲怀永建赵金保白莉
Owner CALB CO LTD
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