Preparation method of high-porosity polyolefin lithium-ion battery diaphragm

A lithium-ion battery, high-porosity technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as inability to achieve effects, and achieve the effects of excellent high-temperature thermal shrinkage, easy control of conditions, and simple preparation methods.

Inactive Publication Date: 2019-11-05
FOSHAN YINGBOLAI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At this stage, the porosity of polyolefin lithium-ion batteries is distributed at about 45%. It can no longer achieve its real effect when used in fast-charging batteries. It is necessary to produce polyolefin lithium-ion battery separators with a porosity of more than 50% to meet its fast-charging effect. Therefore Preparation of high porosity polyolefin lithium ion battery separator is the development demand of the market

Method used

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  • Preparation method of high-porosity polyolefin lithium-ion battery diaphragm
  • Preparation method of high-porosity polyolefin lithium-ion battery diaphragm
  • Preparation method of high-porosity polyolefin lithium-ion battery diaphragm

Examples

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Embodiment example 1

[0032] A method for preparing a high-porosity polyolefin lithium-ion battery diaphragm, comprising casting film preparation-annealing treatment-thermal compounding-stretch setting:

[0033] ①Preparation of cast film: put polypropylene granules into the production extrusion system with extruder temperature of 220°C, runner temperature of 225°C, die temperature of 210°C, cast sheet temperature of 90°C and production speed of 90m / min Extrusion is carried out, and then monolayer cast film is collected;

[0034] ②Annealing treatment: put the prepared single-layer cast film into an annealing device for annealing treatment with an annealing temperature of 110°C and annealing time of 12 hours;

[0035] ③ Thermal lamination: superimpose the single-layer cast film after annealing treatment, so that the cast film with two superimposed layers is put into the lamination device for thermal lamination treatment at a lamination temperature of 80°C to obtain a lamination film;

[0036] ④ Stre...

Embodiment example 2

[0038] A method for preparing a high-porosity polyolefin lithium-ion battery diaphragm, comprising casting film preparation-annealing treatment-thermal compounding-stretch setting:

[0039] ①Preparation of cast film: put polypropylene granules into the production extrusion system with extruder temperature of 230°C, runner temperature of 225°C, die temperature of 210°C, cast sheet temperature of 100°C and production speed of 90m / min Extrusion is carried out, and then monolayer cast film is collected;

[0040] ②Annealing treatment: Put the prepared single-layer cast film into an annealing device for annealing treatment with an annealing temperature of 120°C and annealing time of 18 hours;

[0041] ③ Thermal lamination: superimpose the single-layer cast film after annealing treatment, so that the cast film with two superimposed layers is put into the lamination device for thermal lamination treatment at a lamination temperature of 80°C to obtain a lamination film;

[0042] ④ Str...

Embodiment example 3

[0044] A method for preparing a high-porosity polyolefin lithium-ion battery diaphragm, comprising casting film preparation-annealing treatment-thermal compounding-stretch setting:

[0045] ①Preparation of cast film: put polypropylene pellets into the production extrusion system with extruder temperature of 225°C, runner temperature of 225°C, die head temperature of 210°C, cast sheet temperature of 95°C and production speed of 90m / min Extrusion is carried out, and then monolayer cast film is collected;

[0046] ②Annealing treatment: Put the prepared single-layer cast film into an annealing device for annealing treatment with an annealing temperature of 115°C and annealing time of 15h;

[0047] ③ Thermal lamination: superimpose the single-layer cast film after annealing treatment, so that the cast film with two superimposed layers is put into the lamination device for thermal lamination treatment at a lamination temperature of 80°C to obtain a lamination film;

[0048] ④ Stret...

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Abstract

The invention discloses a preparation method of a high-porosity polyolefin lithium-ion battery diaphragm. The preparation method comprises the steps of casting film preparation; annealing treatment; thermal compounding; and stretch forming. According to the preparation method of the high-porosity polyolefin lithium-ion battery diaphragm, the preparation method of the casting film preparation, theannealing treatment, the thermal compounding and the stretch forming is adopted, parameters of each preparation step process are strictly controlled, so that a prepared product is very excellent in porosity, puncture strength, longitudinal drawing strength and high-temperature heat shrinkage rate; and the preparation method is simple, the requirement on equipment is low, the conditions are easy tocontrol, and the preparation method is suitable for industrial development trend.

Description

technical field [0001] The invention relates to the field of polymer material plastic films, in particular to a preparation method of a high-porosity polyolefin lithium-ion battery diaphragm. Background technique [0002] With the development of lithium-ion batteries, fast-charge batteries have begun to be widely developed, and the development of high-porosity polyolefin lithium-ion battery separators, one of the four major materials for lithium-ion batteries, needs further improvement. The theoretical upper limit of the porosity distribution of the diaphragm is 55%, and its preparation method requires the cooperation of various process parameters. [0003] At present, high-rate lithium-ion batteries are mainly improved by nano-materials, increasing the conductivity of the electrolyte and the porosity of the diaphragm. The diaphragm is between the positive and negative electrodes, and lithium ions are deintercalated from the positive electrode, solvated in the electrolyte, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01H01M2/14H01M2/16
CPCB29D7/01H01M50/403H01M50/411Y02E60/10
Inventor 张泰发彭海生
Owner FOSHAN YINGBOLAI TECH
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