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Oil primer collector for lithium-ion battery and preparation method and application of oil primer collector

A technology for lithium-ion batteries and current collectors, which is applied to battery electrodes, secondary batteries, electrode carriers/collectors, etc., to achieve the effect of short preparation time and simple and easy operation

Active Publication Date: 2017-06-13
SHENZHEN DYNANONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, primer slurries are available, but many existing primers cannot provide good electrical contact between layers while also improving good adhesion of electrode active materials and current collectors

Method used

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  • Oil primer collector for lithium-ion battery and preparation method and application of oil primer collector
  • Oil primer collector for lithium-ion battery and preparation method and application of oil primer collector
  • Oil primer collector for lithium-ion battery and preparation method and application of oil primer collector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] A preparation method of an oily primer coating current collector, comprising the following steps:

[0068] 1. Add 60g of PEG to 1380g of NMP, stir in the dispersion tank for 30min to dissolve completely;

[0069] 2. Add 200g of graphene (flaky) and 400g of 350G (spherical) to the above dispersion tank and stir for 30min. After the dispersion is uniform, use a sand mill to sand 4-5 times until the particle size D50 of the mixture is 20μm That's it, stop sanding;

[0070] 3. Add 15g of PVA (molecular weight is 5-300,000) in the dispersing tank of step 2, stir, obtain the oily primer slurry that viscosity is about 4Pa·s;

[0071] 4. The obtained oily primer slurry is coated on the surface of the aluminum foil current collector base material by scraper technology, and after drying, a primer layer with a thickness of 0.1 micron is formed to obtain an oily primer collector.

[0072] figure 1 It is a schematic structural view of the oil-based primer-coated current collector...

Embodiment 2

[0103] A preparation method of an oily primer coating current collector, comprising the following steps:

[0104] 1. Add 72g of Triton X-100 into 1560g of NMP, and stir in the dispersion tank for 60min to dissolve completely;

[0105] 2. Add 100g of KS-6 (flaky) and 500g of Ketjen Black (spherical) to the above dispersion tank and stir for 2 hours. After the dispersion is uniform, use a sand mill to sand 4-5 times until the particle size of the mixture is D50 is 20-90μm, stop sanding;

[0106] 3. Add 18g of PVDF (molecular weight is 400,000) to the dispersing tank of step 2, stir to obtain an oily primer slurry with a viscosity of about 3Pa·s;

[0107] 4. Apply the obtained oily primer slurry on the surface of the copper foil current collector base material by scraper technology, and form a primer layer after drying to obtain an oily primer collector.

[0108] The undercoat layer of the oily undercoated current collector obtained in Example 2 is coated with a positive electr...

Embodiment 3

[0110] A preparation method of an oily primer coating current collector, comprising the following steps:

[0111] 1. Add 63g of polyvinylpyrrolidone PVP into 1400g of NMP, and stir in the dispersion tank for 45min to dissolve completely;

[0112] 2. Add 250g of flake graphite (flaky) and 300g of acetylene black (spherical) to the above dispersion tank and stir for 2 hours. After the dispersion is uniform, use a sand mill to perform sand grinding for 4-5 times until the particle size D50 of the mixture is 20-90μm is enough, stop sanding;

[0113] 3. Add 15g of vinylidene fluoride-hexafluoropropylene copolymer P(VDF-HFP) (molecular weight: 1,000,000) to the dispersion tank in step 2, and stir to obtain an oily primer slurry with a viscosity of about 8Pa·s material;

[0114] 4. Apply the obtained oily primer slurry on the surface of the copper foil current collector base material by scraper technology, and form a primer layer after drying to obtain an oily primer collector.

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Abstract

The invention provides a preparation method of an oil primer collector for a lithium-ion battery. The preparation method comprises the following steps of preparing oil primer paste; mixing an oil dispersant and a solvent in advance, adding flaky conductive carbon and spherical conductive carbon for stirring, and adding an oil binder to obtain the oil primer paste; and coating the surface of a current base material with the oil primer paste, drying and then forming a coating to obtain the oil primer collector. The surface coarseness of the oil primer collector is relatively high, the peeling strength between the oil primer collector and an active matter can be improved, and the contact resistance between the oil primer collector and the active matter is improved, so that the internal resistance of the battery is reduced, the compaction density and energy density of the battery are improved, and the possibility is provided for power endurance of the battery.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery functional conductive current collector, in particular to an oily primer-coated current collector for a lithium-ion battery, a preparation method and application thereof. Background technique [0002] A typical electrochemical cell has a cathode and an anode that participate in electrochemical reactions. To make electrodes, an electroactive material can be coated onto a current collector, which can serve as the positive and negative materials of the battery. Maintaining electrical contact between electrode active materials and conductive current collectors is critical for the efficient operation of electrochemical cells. [0003] Known, the transition layer coated between the electrode active material and the current collector, known as "primer" or "undercoat", can be bonded between the electrode active material and the current collector, and provide the electrode active material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M10/0525H01M4/13
CPCH01M4/13H01M4/66H01M4/667H01M10/0525Y02E60/10
Inventor 孔令涌尚伟丽陈玲震李佳佳胡晓宁
Owner SHENZHEN DYNANONIC
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