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Polytetrafluoroethylene composite isolation membrane for lithium battery

A polytetrafluoroethylene and polyethylene microporous film technology, applied in battery pack parts, circuits, electrical components, etc., can solve problems such as hidden dangers of lithium battery safety, poor thermal stability, and large shrinkage ratio, and achieve excellent mechanical properties. Performance, overall performance improvement, improved close-knit effect

Inactive Publication Date: 2011-08-24
SHANGHAI JINYOU FLUORINE MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyethylene microporous membrane melts at about 130°C, while the polypropylene microporous membrane melts at about 150°C, so the thermal stability is relatively poor. Melting and shrinkage deformation and membrane rupture bring potential hidden dangers to the safety of lithium batteries
[0007] All in all, the safety performance of polyethylene microporous membrane and polypropylene microporous membrane as lithium battery separator has not yet achieved a relatively ideal effect, and needs to be further improved.

Method used

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  • Polytetrafluoroethylene composite isolation membrane for lithium battery
  • Polytetrafluoroethylene composite isolation membrane for lithium battery
  • Polytetrafluoroethylene composite isolation membrane for lithium battery

Examples

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Embodiment 1

[0022] see figure 1 , The polytetrafluoroethylene composite separator for lithium batteries of the invention comprises a separator, the separator is a polyethylene microporous membrane 1, and the end face and both sides of the polyethylene microporous membrane 1 are covered with A polytetrafluoroethylene microporous membrane 3 is combined.

Embodiment 2

[0024] see figure 2 , The polytetrafluoroethylene composite separator for lithium batteries of the invention comprises a separator, the separator is a polypropylene microporous membrane 2, and the end face and both sides of the polypropylene microporous membrane 2 are covered with A polytetrafluoroethylene microporous membrane 3 is combined.

Embodiment 3

[0026] refer to image 3 , the polytetrafluoroethylene composite separator for lithium batteries of the invention comprises a separator, the separator is a composite membrane of the polyethylene microporous membrane 1 and the polypropylene microporous membrane 2, the The polyethylene microporous membrane 1 and the polypropylene microporous membrane 2 of the composite membrane are coated with a polytetrafluoroethylene micropore on the end face of the polyethylene microporous membrane 1 and on both sides of the composite membrane. film3.

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Abstract

The invention discloses a polytetrafluoroethylene composite isolation membrane for a lithium battery. The polytetrafluoroethylene composite isolation membrane comprises an isolation membrane which is a polyethylene microporous membrane or a polypropylene microporous membrane or a composite membrane of the polyethylene microporous membrane and the polypropylene microporous membrane; and the polytetrafluoroethylene composite isolation membrane is characterized in that: a polytetrafluoroethylene microporous membrane is coated on an end face and two sides of the polyethylene microporous membrane, or a polytetrafluoroethylene microporous membrane is coated on an end face and two sides of the polypropylene microporous membrane, or a polytetrafluoroethylene microporous membrane is coated on an end face of the polyethylene microporous membrane of the composite membrane of the polyethylene microporous membrane and the polypropylene microporous membrane and on two sides of the composite membrane. The polytetrafluoroethylene composite isolation membrane for the lithium battery can effectively isolate positive and negative plates of the lithium battery and completely eradicate a short circuit; moreover, the lithium battery is safe and reliable and has no accident in the charging and discharging processes. The polytetrafluoroethylene composite isolation membrane for the lithium battery can be used for isolating the positive and negative plates of the lithium battery.

Description

Technical field: [0001] The invention relates to a separator for a lithium battery, in particular to a polytetrafluoroethylene composite separator for a lithium battery. Background technique: [0002] The battery is mainly composed of electrode materials, electrolyte and separator. The function of the battery separator is to ensure the passage of ions in the electrolyte, and when reducing the distance between the positive and negative plates of the battery, it can isolate the positive and negative plates of the battery in a small space of the battery to prevent the two poles of the battery from The boards touch each other causing a short circuit. [0003] At present, the commonly used lithium battery separators are polyethylene microporous membranes or polypropylene microporous membranes, or composite membranes of polyethylene microporous membranes and polypropylene microporous membranes. The main reason is that polyethylene microporous membranes and polypropylene microporo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16C08L23/06C08L23/12C08L27/18B32B27/06B32B27/32
CPCY02E60/12Y02E60/10
Inventor 黄斌香黄磊
Owner SHANGHAI JINYOU FLUORINE MATERIALS
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