Coating membrane for high energy density rechargeable lithium batteries

A rechargeable lithium battery, high energy density technology, applied in the direction of secondary batteries, battery components, circuits, etc., can solve the problems of reduced battery cycle life, battery safety issues, etc.

Active Publication Date: 2017-01-25
杭州驷拓新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of such a soft case battery, since the case is soft, an air layer is easily formed between the electrode and the separator when charging and discharging, and the separator is separated from the electrode, resulting in a decrease in battery cycle life and battery safety issues

Method used

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  • Coating membrane for high energy density rechargeable lithium batteries
  • Coating membrane for high energy density rechargeable lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Coated separators are made by:

[0035] Step 1. Plasticization: Add polypropylene granules to the extruder to plasticize and then extrude. The extrusion temperature is set at 170 ° C. Then, the roller is cooled and rolled to obtain a polypropylene sheet film; the polypropylene Isotactic polypropylene with isotacticity ≥ 90% is used, and the average molecular weight is 1×10 6 , The melt index is 1.0g / 10min.

[0036] Step 2. Configuration of the composite fiber solution: add polypropylene fiber and polyethylene fiber to the water to prepare the composite fiber solution, and stir evenly; wherein, the fiber length of the polypropylene fiber is 2-10 mm; the fiber length of the polyethylene fiber is 2 mm. ~10mm, according to the mass ratio, water: polypropylene fiber: polyethylene fiber = 10:1:1;

[0037] Step 3. Composite: Coating the composite fiber solution of polypropylene fiber and polyethylene fiber on both sides of the polypropylene sheet film to obtain a coated shee...

Embodiment 2

[0044] Coated separators are made by:

[0045] Step 1. Plasticization: Add polypropylene granules to the extruder to plasticize and extrude. The extrusion temperature is set at 162 ° C. Then, the roller is cooled and rolled to obtain a polypropylene sheet film; the polypropylene Isotactic polypropylene with isotacticity ≥ 90% is used, and the average molecular weight is 1×10 6 , The melt index is 1.0g / 10min.

[0046]Step 2. Configuration of the composite fiber solution: add polypropylene fiber and polyethylene fiber to the water to prepare the composite fiber solution, and stir evenly; wherein, the fiber length of the polypropylene fiber is 2-10 mm; the fiber length of the polyethylene fiber is 2 mm. ~10mm, according to the mass ratio, water: polypropylene fiber: polyethylene fiber = 10:1:1;

[0047] Step 3. Composite: Coating the composite fiber solution of polypropylene fiber and polyethylene fiber on both sides of the polypropylene sheet film to obtain a coated sheet film...

Embodiment 3

[0054] Coated separators are made by:

[0055] Step 1. Plasticization: Add polypropylene granules to the extruder to plasticize and then extrude. The extrusion temperature is set at 175°C. Then, the roller is cooled and rolled to obtain a polypropylene sheet film; the polypropylene Isotactic polypropylene with isotacticity ≥ 90% is used, and the average molecular weight is 1×10 6 , The melt index is 1.0g / 10min.

[0056] Step 2. Configuration of the composite fiber solution: add polypropylene fiber and polyethylene fiber to the water to prepare the composite fiber solution, and stir evenly; wherein, the fiber length of the polypropylene fiber is 2-10 mm; the fiber length of the polyethylene fiber is 2 mm. ~10mm, according to the mass ratio, water: polypropylene fiber: polyethylene fiber = 10:1:1;

[0057] Step 3. Composite: Coating the composite fiber solution of polypropylene fiber and polyethylene fiber on both sides of the polypropylene sheet film to obtain a coated sheet ...

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Abstract

A coating membrane used for ghigh energy density rechargeable lithium batteries is classified into the field of battery membrane technology, including a multi-hole basilemma and the coating on one side or both sides of the basilemma. The diameter of the holes distributed on the basilemma is from 0.02 micrometer to 0.1 micrometer. The distribution area Delta of the holes is 0.5 or even small. The coating uses kynar resin as adhesive agent. The membrane improves the penetration ratio of the ion and strengthens the circulating and promotes the adhesive ability of the electrode.

Description

technical field [0001] The invention belongs to the technical field of battery separators, and in particular relates to a coated separator for rechargeable lithium batteries with high energy density. Background technique [0002] Non-aqueous electrolyte rechargeable batteries, such as lithium-ion secondary batteries, have been widely used as power sources for portable electronic devices such as notebook computers, mobile phones, digital cameras, and video cameras. In addition, these batteries are characterized by high energy density, and thus have been extensively researched and applied in the field of electric vehicles in recent years. [0003] Due to the gradual reduction in size and weight requirements of portable electronic devices, the casing of non-aqueous electrolyte batteries has been gradually simplified. As an exterior part, the earliest battery cans were made of stainless steel, which was then replaced by aluminum-shelled battery cans. Now it is replaced by alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/449H01M50/497
CPCH01M10/0525H01M50/403H01M50/411H01M50/44H01M50/449Y02E60/10
Inventor 田晓波郭松田华
Owner 杭州驷拓新材料科技有限公司
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