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Labthink Instruments Co., Ltd.
Property Concerns of Lithium Ion Battery Separators

Property Concerns of Lithium Ion Battery Separators

Product catalog summary

Business Challenge
Lithium-ion batteries are popular for their high energy-to-weight ratio and slow charge loss, making them ideal for portable electronics. However, they pose risks of fire and overheating, leading to stricter global safety requirements.

Lithium Ion Battery Separators
Separators are crucial components in lithium-ion batteries, preventing short circuits while allowing ionic charge transport. They are made from materials like fiberglass or plastic films and must be thin, absorbent, and resistant to penetration.

Properties of Lithium Ion Battery Separators

Chemical Stability
Thickness: Must balance energy density and mechanical strength, with 25.4μm as the standard.
Porosity and Pore Size
Permeability: Measured by the Gurley value, indicating pore tortuosity.
Mechanical Strength: Defined by tensile strength and puncture resistance.
Wet ability and Thermal Capabilities

Solutions
Labthink provides specialized testing equipment for ensuring separator properties, adhering to international standards. Their tools include:

Thickness Measurement: High precision gauges for thin films.
Mechanical Strength Testing: Tensile testers designed for flexible packaging.
Permeability Testing: Instruments for air permeation testing, compliant with ASTM D1434.

Catalog excerpts

Property Concerns of Lithium Ion Battery Separators-1

Property Concerns of Lithium Ion Battery Separators Business Challenge Lithium-ion batteries have one of the best energy-to-weight ratios, no memory effect, and a slow loss of charge when not in use. This makes them one of the most popular types of batteries for portable consumer electronics in today’s marketplace. Lithium-ion batteries can be found in cameras, laptops, power tools, toys and more. However, as recent well-publicized recalls demonstrate, they can pose a risk of fire and overheating. In addition, they can suffer from a reduced lifespan if not properly treated. As a result, new and stricter requirements are being implemented globally to address potential hazards, leaving manufacturers and purchasers of products containing lithium-ion batteries to meet increasing requirements and overcome safety concerns. Lithium Ion Battery Separators A Lithium Ion battery Separator is a permeable membrane placed between the anode and cathode of a l-ion battery. The main function of a separator is to keep the positive and negative electrodes, the cathode and anode respectively, apart to prevent electrical short circuits while also allowing the transport of ionic charge carriers which are needed to complete the circuit during the passage of current in an electrochemical cell. As mentioned above, separators are power-driven spacers. They can be produced with fiberglass cloth or flexible plastic films made from nylon, polyethylene or polypropylene. It must be absorbent and slim to allow the charged lithium ions to pass without obstruction and it should take up the minimum of space allowed, leaving available space for the cathode active elements. The separators must be able to withstand penetration and branching moss-like crystalline minerals in order to prevent the electrodes from contamination. If the separator breaks down or is infiltrated, this will weaken high power cells end results. Properties of Lithium Ion Battery Separators Chemical Stability Thickness of Separator Porosity of Separator www.labthink.cn/en

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Property Concerns of Lithium Ion Battery Separators-2

Pore Size Permeability Mechanical Strength Wet ability Stability Thermal Capabilities Thickness of Separator A battery separator must be relatively thin in order to facilitate the high energy and power densities of the battery. However, if the separator is too thin, it can decrease the mechanical strength and safety of the battery. Additionally, a separator should have uniform thickness in order to support the long like cycle of a battery. In current technologies, 25.4μm is generally accepted as the standard width. The thickness of a polymer separator can be measured using the T411 om-83 method...

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Property Concerns of Lithium Ion Battery Separators-3

Solutions In order to ensure the properties of Lithium Ion Battery separators, some related tests are becoming necessary. Labthink instruments Co., Ltd is the only manufacturer of testing equipment professionally for thin film filed. Everything equipment they have is strictly applying to international standards and considered the manufacturers and users benefits of batteries Thickness Measurement A Gauge used to measure a separator thickness must be with high precision and resolution. Labthink Thickness Tester is professional designed for thin film and paper, with 0 ~ 2mm test range and 0.1 μm...

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