The lithium-ion battery separator is a critical functional thin-film material within lithium-ion batteries, used to physically separate the positive and negative electrodes while allowing lithium ions to freely pass through during charging and discharging. Unlike ordinary insulating films, this separator must possess high porosity, stable electrochemical compatibility, and reliable mechanical strength at extremely thin thicknesses to ensure the safe operation of the battery under high energy density conditions. Its performance directly impacts the battery's safety, cycle life, and rate performance, making it one of the indispensable core components in lithium-ion battery systems.

Lithium Ion Battery Separator Parameters:

Lithium Ion Battery Separator Features:

1. Microporous Structure

The Lithium Ion Battery Separator features a multi-microporous structure design, with pore sizes typically controlled within the range of 0.03 to 0.1 micrometers and a porosity of 35%-50%. This ensures sufficient electrolyte wetting while stably restricting electron passage, thereby improving battery charging and discharging efficiency.

2. Film Thickness

The separator thickness commonly ranges from 16 to 25 micrometers, effectively reducing internal resistance while maintaining high ion flux. Thickness tolerance is typically controlled within ±1 micrometer, contributing to improved battery pack consistency and assembly reliability.

3. Mechanical Strength

This separator possesses high tensile strength, with longitudinal tensile strength exceeding 120 MPa and transverse strength not less than 90 MPa. It is resistant to cracking or deformation during cell winding and stacking processes.

4. Thermal Stability

The material typically uses a polyethylene or polypropylene system, maintaining structural stability below 120 degrees Celsius. It also possesses thermal shutdown characteristics; when the temperature rises abnormally, the micropores shrink, reducing ion channels and enhancing safety protection.

5. Electrochemical Compatibility

The separator exhibits good chemical stability with commonly used lithium battery electrolytes. Under long-term immersion conditions, the dimensional change rate is less than 2%, and it does not swell or decompose, ensuring stable battery performance during cycling.

Lithium Ion Battery Separator Application:

1. Power Batteries

In power lithium-ion batteries, the Lithium Ion Battery Separator is used to support high energy density and high-rate discharge requirements. The separator's performance directly affects the battery's safety level and lifespan.

2. Energy Storage Systems

In energy storage battery applications, this separator helps maintain long-term cycle stability, reduces capacity degradation, and enables the system to operate reliably under high-frequency charging and discharging conditions.

3. Consumer Electronics

When used in consumer electronics batteries such as those for mobile phones and laptops, the separator's uniformity and thin design support higher space utilization, meeting the product's requirements for lightweight design and long battery life.

4. Power Tools

In power tool batteries, this separator needs to withstand high instantaneous discharge currents. Its structural stability helps prevent performance degradation or safety risks caused by internal short circuits.

5. Mobile Devices

When applied to various mobile device batteries, the separator enables stable ion transport within a limited volume, supporting the continuous power supply needs of devices in complex operating environments.

Lithium Ion Battery Separator FAQs:

Q: What is the main function of a Lithium Ion Battery Separator?

A: The separator is used to physically isolate the positive and negative electrodes, preventing direct contact and short circuits. It also provides a controlled channel for lithium ions, making it a core material for ensuring battery safety and performance.

Q: Does the separator thickness affect battery performance?

A: Thickness directly affects internal resistance and energy density. Too thick a separator will reduce battery efficiency, while too thin a separator increases safety risks. Therefore, precise control within the design range is necessary. Please consult us if you have any questions.

Q: What are the differences between polyethylene and polypropylene separators?

A: The two materials differ in thermal characteristics and mechanical strength. The specific choice depends on the battery design requirements and operating temperature range. Please consult us before customization.

Q: Does the separator determine battery life?

A: Yes. The separator has a significant impact on battery life. Its stability and consistency directly affect cycle performance, but it needs to be matched with the electrodes and electrolyte.

Q: Do you support customized specifications?

A: Yes, our Lithium Ion Battery Separators can be customized in thickness, width, and winding specifications according to customer needs to suit different cell structures and manufacturing processes.