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Electrode and preparation method therefor

An electrode and conductive agent technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high resistance and adverse effects of normal use of lithium-ion batteries, and achieve the effect of improving safety performance and improving the high conductivity at room temperature

Active Publication Date: 2017-12-05
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of conductive carbon is often relatively fluffy and loose, and it is difficult to disconnect when the polymer substrate expands, and then there is no PTC effect.
If the PTC effect is promoted by reducing the conductive carbon content, the resistance at room temperature will be too high, which will adversely affect the normal use of lithium-ion batteries

Method used

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  • Electrode and preparation method therefor
  • Electrode and preparation method therefor

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Experimental program
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preparation example Construction

[0025] Next, the preparation method of the electrode according to the second aspect of the present invention is described, which is used to prepare the electrode described in the first aspect of the present invention, comprising the steps of: adding a conductive agent to a polymer matrix in a molten state or a solution state, and mixing uniformly to obtain a slurry Materials, wherein the polymer matrix is ​​selected from low-density polyethylene, high-density polyethylene, epoxy resin, polyvinylidene fluoride, ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, polybutene, cellulose acetate , one or more of polyamides, and the conductive agent is selected from one or more of thorny Ni powder, thorny Cu powder, thorny Al powder, and thorny tungsten carbide; the slurry is uniformly It is coated on the current collector, and the coating is obtained after drying; a layer of active material slurry is coated on the coating, and the active material layer is formed aft...

Embodiment 1

[0032] (1) Preparation of electrolyte

[0033] Using 1M lithium hexafluorophosphate (LiPF 6 ) as a lithium salt, using a mass ratio of 50:50 EC:PC mixed non-aqueous solvent mixed as the electrolyte.

[0034] (2) Preparation of positive electrode sheet

[0035] In terms of mass fraction, 96% of the positive electrode active material LiCoO 2 , 2% of the binder polyvinylidene fluoride (PVDF), 2% of the conductive agent Super-P are added to the solvent N-methylpyrrolidone (NMP) and mixed to obtain a uniformly dispersed black paste. The black slurry is coated on the front and back sides of the positive electrode current collector Al foil with a thickness of 12 μm by roller coating and then dried. After the black slurry is dried, a positive electrode active material layer is formed, and then cold pressed, edge trimmed, After cutting, slitting, and welding the positive ear, the positive electrode piece is obtained.

[0036] (3) Preparation of negative electrode sheet

[0037] In t...

Embodiment 2

[0042] (1) Preparation of electrolyte

[0043] With embodiment 1.

[0044] (2) Preparation of positive electrode sheet

[0045] In terms of mass fraction, 70% of the polymer matrix low-density polyethylene is melted, and then 20% of the conductive agent thorny Al powder and 10% of the inorganic particles are added. 2 o 3 (particle size is 1 μm), after mixing evenly, it is evenly coated on the front and back sides of the positive electrode current collector Al foil with a thickness of 12 μm by roller coating, and the coating is obtained after drying, and the thickness of the coating is 3 μm.

[0046] In terms of mass fraction, 96% of the positive electrode active material LiCoO 2 , 2% of the binder polyvinylidene fluoride (PVDF), 2% of the conductive agent Super-P are added to the solvent N-methylpyrrolidone (NMP) and mixed to obtain a uniformly dispersed black paste. The black slurry is coated on the above-mentioned coating by roller coating, and the positive electrode act...

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Abstract

The invention provides an electrode and a preparation method therefor. The electrode comprises a current collector and an active material layer arranged on the current collector; the electrode also comprises a coating layer arranged between the current collector and the active material layer; the coating layer comprises a polymer substrate and a conductive agent; the polymer substrate is selected from one or more of low-density polyethylene, high-density polyethylene, epoxy resin, polyvinylidene fluoride, an ethylene-ethyl acrylate copolymer, an ethylene-vinyl acetate copolymer, polybutylene, cellulose acetate and polyamide; and the conductive agent is selected from one or more of acanthosphere-shaped Ni powder, acanthosphere-shaped Cu powder, acanthosphere Al powder and acanthosphere-shaped tungsten carbide. The electrode has the advantages of low normal-temperature resistor and high PTC strength, so that improvement of safety performance of a lithium ion battery can be facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrode and a preparation method thereof. Background technique [0002] The safety performance of lithium-ion batteries is one of the main factors limiting its application to power batteries. In order to improve the safety performance of lithium-ion batteries, various safety schemes including positive temperature coefficient (PTC) materials have been studied. PTC materials used in lithium-ion batteries need to meet the following basic characteristics: (1) low room temperature resistivity, high PTC strength (large lift-to-drag ratio); (2) suitable Curie temperature; (3) chemical and electrochemical stability sex. Min Lining (Journal of Beijing Institute of Technology, 2004, 24(7), pp. 653-656) and others used a new type of positive temperature coefficient material to replace the conductive agent for lithium-ion batteries, and used the metal-insulator phase tra...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/139H01M10/0525
CPCH01M4/139H01M4/626H01M10/0525Y02E60/10
Inventor 刘阳李强宋晋阳闫传苗
Owner CONTEMPORARY AMPEREX TECH CO
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