Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation

A polyvinylidene fluoride, lithium battery technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve problems such as unreported, expansion and deformation, not found, etc., to reduce processing procedures and reduce swelling. , the effect of high production efficiency

Active Publication Date: 2017-02-22
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
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Problems solved by technology

[0009] Due to the unique physical and chemical properties of PVDF, a variety of grafted modified polymers have been used in batteries and other devices. However, the existing literature mainly focuses on the direction of modified PVDF membranes for proton exchange. Although the current commercial Batteries widely use PVDF as the binder of cathode and anode materials, but the work of i...

Method used

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  • Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation
  • Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation
  • Method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Preparation of positive electrode sheet for lithium ion battery:

[0029] The positive electrode active material lithium cobalt oxide, lithium nickel cobalt manganese oxide, conductive carbon, and binder PVDF were mixed in the solvent NMP according to the mass ratio of 70:25:3:2, and stirred evenly to obtain the positive electrode slurry. Coat the obtained positive electrode slurry on a 9 μm aluminum foil, dry, and cold press to obtain a compacted density of 1.5 g / cm 3 The pole piece is then cut and welded to obtain the positive pole piece.

[0030] Preparation of lithium ion battery negative electrode sheet:

[0031] Add the negative electrode active material natural graphite, conductive carbon, and binder PVDF (final melting temperature is 160 degrees) into the solvent NMP according to the mass ratio of 96:2:2, and mix well to obtain the negative electrode slurry, and then coat the negative electrode slurry with Coated on both sides of 8μm thick metal copper foil, d...

Embodiment 2

[0040] Different from Example 1 is the irradiation of lithium ion battery:

[0041] Place the lithium-ion battery on the under-beam device under the denami accelerator, load it on a trolley, and lay it out in an orderly manner. Select the denami accelerator, the accelerator energy is 5MeV, adjust the parameters of the irradiation equipment, and adjust the accelerator energy and the speed of the device under the accelerator beam so that the dose rate is 5000Gy / s, and the lithium-ion battery is irradiated. 70kGy, making PVDF partially cross-linked. Afterwards, the lithium-ion battery was taken out of the car, and the battery performance was tested.

[0042] All the other are with embodiment 1.

Embodiment 3

[0044] Different from Example 1 is the irradiation of lithium ion battery:

[0045] Place the lithium-ion battery on the under-beam device under the denami accelerator, load it on a trolley, and lay it out in an orderly manner. Select the denami accelerator, the accelerator energy is 5MeV, adjust the parameters of the irradiation equipment, and adjust the accelerator energy and the speed of the device under the accelerator beam so that the dose rate is 5000Gy / s, and the lithium-ion battery is irradiated. 100 kGy, making PVDF partially cross-linked. Afterwards, the lithium-ion battery was taken out of the car, and the battery performance was tested.

[0046] All the other are with embodiment 1.

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Abstract

A method for improving adhesive performance of lithium battery polyvinylidene fluoride by irradiation belongs to the technical field of lithium batteries. A lithium battery with polyvinylidene fluoride (PVDF) adhesive is prepared, the whole battery is placed under an electronic accelerator or on a radiation processing device of Dynamitron and is exposed to irradiation under the irradiation dosage of 20-200 kGy and irradiation dosage rate of 50-15000 Gy/s, PVDF is partially crosslinked, the adhesive performance of PVDF is changed, battery thickness bulking rate is decreased, capacity retention of the battery is increased, battery stability is improved, and the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and relates to a method for improving the adhesive performance of polyvinylidene fluoride of lithium batteries by irradiation. Background technique [0002] Energy is the material basis for human survival and development. Fossil fuels (coal, oil, natural gas) have always been the main body of human energy utilization. With the rapid development of society, problems such as non-renewable fossil fuels, limited reserves, and environmental pollution caused by combustion processes have gradually emerged. Electricity obtained through the conversion of natural energy such as wind energy, solar energy, hydroelectric energy, geothermal energy, and ocean energy cannot be applied on a large scale due to poor stability and continuity. Batteries, especially secondary batteries, as an energy storage medium that stores discontinuous electricity and releases it smoothly during application, realizes t...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M10/058
CPCH01M4/621H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 罗敏马玲玲徐殿斗
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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