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Polyimide coated separator for lithium batteries or capacitor

A polyimide coating, polyimide technology, applied in the field of polyimide coating film, diaphragm or separator, can solve the problem of thermal runaway of lithium battery

Pending Publication Date: 2021-10-15
CELGARD LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other short circuits, such as hard shorts, can cause thermal runaway of lithium batteries, which is a serious safety issue for lithium rechargeable batteries

Method used

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  • Polyimide coated separator for lithium batteries or capacitor
  • Polyimide coated separator for lithium batteries or capacitor
  • Polyimide coated separator for lithium batteries or capacitor

Examples

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Embodiment Construction

[0042] A typical lithium battery (or cell) consists of a lithium metal or alloy anode, a cathode, and a separator disposed between the anode and cathode, all packaged in a cylindrical cell or "jelly roll" cell or Prismatic or stacked cells in cans or pouches. The invention is not limited to a particular battery or cell configuration, and is also well suited for coin cells, polymer batteries, and the like. Furthermore, the electrolyte can be liquid (organic or inorganic) or gel (or polymer). For convenience, the present invention will be described with respect to cylindrical battery cells with liquid organic electrolytes, but is not limited thereto, and can be applied to other battery cell types (eg, energy storage systems, capacitors, combined cells, and capacitors) and configurations.

[0043] Possibly preferred anodes should have high energy or high voltage capability or capacity, preferably greater than or equal to 372 mAh / g, preferably 700 mAh / g, most preferably 1000 mAh / ...

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Abstract

The invention is related to a membrane or separator with a polyimide coating for a lithium battery or lithium- ion capacitor. The separator includes a porous or microporous polyimide coating or layer on at least one side of a polymeric microporous layer, membrane or film. The polyimide coating or layer may include other polymers, additives, fillers. The invention provides oxidation resistance, blocks dendrite growth, adds dimensional stability, reduces shrinkage, adds high temperature performance (HTMI function), prevents electronic shorting at temperatures above 200 deg C in rechargeable lithium battery. The separator with a polyimide coating provides blocking ionic flow between the anode and the cathode in the event of thermal runaway (shutdown function).

Description

[0001] field of invention [0002] The present disclosure or invention preferably relates to polyimide coated films, separators or separators for lithium batteries such as high energy or high voltage rechargeable lithium batteries and corresponding batteries. The separator preferably comprises a porous or microporous polyimide coating or layer on at least one side of the polymeric microporous layer, membrane or film. The polyimide coating or layer may include other polymers, additives, fillers, and the like. Polyimide coatings may be suitable for example to provide oxidation resistance, prevent dendrite growth, increase dimensional and / or mechanical stability, reduce shrinkage, increase high temperature performance (HTMI function), prevent electrons from occurring at temperatures above 200 degrees Celsius short circuit etc. The microporous polymeric substrate can be adapted at least to accommodate a liquid, gel, or polymer electrolyte, conduct ions, and / or block ion flow betwe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/449H01M50/423H01M10/052H01G11/52H01M50/403H01M50/414H01M50/417H01M50/457H01M50/489H01M50/491
CPCH01M10/052H01G11/52Y02E60/13Y02E60/10H01M50/403H01M50/449H01M50/417H01M50/489H01M50/457H01M50/414H01M50/491H01M10/4235H01M50/59H01M50/581H01M50/461Y02P70/50
Inventor 张正铭长青·王·亚当斯
Owner CELGARD LLC