Thin Battery Separator

JP7828384B2Active Publication Date: 2026-03-11CELGARD LLC
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2024-04-05
Publication Date
2026-03-11

AI Technical Summary

Technical Problem

Existing battery separators are not thin enough to achieve optimal performance in terms of capacity, electrode utilization, and flexibility, and they fail to prevent dendrite growth and internal shorts effectively.

Method used

Development of ultra-thin or super-thin battery separators made from single-layer or multi-layer microporous polyolefin membranes, often with a tri-layer structure of PP/PE/PP, where the thickness is controlled to be 12 μm or less, and the PE layer is optimized for high density at the PP/PE interface to ensure thermal shutdown and prevent dendrite growth.

Benefits of technology

The ultra-thin separators provide effective shutdown, prevent dendrite growth, and enhance cycle life, ensuring better battery performance and safety by maintaining high ion permeability and mechanical strength.

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Patent Text Reader

Abstract

To provide optimized, novel or improved ultra-thin battery separators.SOLUTION: An improved battery separator is made of a single layer or multilayer, shutdown microporous polyolefin membrane having at least one shutdown polyethylene layer thickness less than or equal to about 6 μm, possibly (preferably less than or equal to about 5 μm, further preferably less than or equal to about 4 μm, further preferably less than or equal to about 3 μm, further preferably less than or equal to about 2 μm, and further preferably less than or equal to about 1.5 μm).SELECTED DRAWING: Figure 1
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Citation Information

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