A kind of composite diaphragm for lithium ion battery and preparation method thereof

A lithium-ion battery and composite separator technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of reducing ceramic grafting rate, product loss, low grafting rate, etc., to improve high-temperature thermal stability, The effect of improving adhesion and weakening hydrogen bonding
CN103956450BActive Publication Date: 2016-08-24DONGFANG ELECTRIC CORP LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DONGFANG ELECTRIC CORP LTD
Publication Date
2016-08-24

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Abstract

The invention discloses a composite separator for lithium ion batteries and a preparation method thereof, including a ceramic coating modification method and a ceramic lithium battery separator. The ceramic protective layer is mainly a mixture composed of ceramics graft-modified by anionic surfactants containing sodium sulfonate or sodium carboxylate groups, and a binder. The grafting is completed under the action of dehydrating agent and using the "grafting to" method. The grafting rate of ceramics is relatively high. The modified ceramic separator has greatly improved the performance of the modified ceramic separator due to the introduction of high-temperature-resistant high-specific surface area nanoceramics on the surface of the conventional PP separator. The insulation and electrolyte wettability of the separator are improved, especially at high temperatures of 130°C, 150°C and 180°C, showing excellent high-temperature thermal stability. The lithium battery composite separator avoids the heat shrinkage of conventional separators, thereby avoiding thermal runaway inside the battery caused by heat shrinkage, thereby improving the safety and reliability of lithium-ion batteries.
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Description

Technical field

[0001] The invention belongs to the technical field of lithium ion batteries, and specifically relates to a composite separator for lithium ion batteries and a preparation method thereof. More specifically, the invention relates to a composite separator containing an anionic surfactant and modifying the coating of ceramics through grafting, thereby improving the A method of dispersion and adhesion of ceramics. Background technique

[0002] Since their commercialization, lithium-ion batteries have been widely used as power sources for various mobile devices due to their high energy density, high operating voltage, no memory effect, and long cycle life. It is very likely to become the most important power supply system in the field of energy storage and electric vehicles. However, with the large-scale application of lithium-ion batteries, battery safety issues have become increasingly prominent.

[0003] One of the key factors affecting the safety of lithium-i...

Claims

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