Applications of PTFE High-Temperature Fabric in Lithium Battery Industry

As a source manufacturer of PTFE high-temperature fabric, Jiangsu Aokai New Materials gives you a professional introduction. In lithium battery manufacturing, PTFE high-temperature fabric is mainly applied for protection, isolation and conveying in key processes by virtue of its high temperature resistance, chemical inertness and non-stick property. Its resistance to electrolyte corrosion involves far more rigorous industrial requirements than simple corrosion resistance.

Core Application 1: Electrode Production and Cell Assembly

In the manufacturing of battery electrodes and cell assembly processes, PTFE high-temperature fabric is widely used for conveying, protection and hot pressing isolation.

Electrode Drying Conveyor BeltIt serves as a conveyor belt during the high-temperature drying of positive and negative electrodes at 120℃~180℃. Its low surface energy prevents adhesion of ternary materials, graphite and other slurries, avoiding contamination and damage to electrode coatings.

Cell Hot Press SealingWith a common thickness of 0.18 mm, it acts as an isolation and protection layer between the hot pressing head and pouch cell during thermal sealing. Resistant to temperatures above 240℃, it ensures uniform heat transfer, prevents adhesion and improves packaging yield.

Tab Welding and Hot Press ProtectionIt is used as shielding and isolation material during tab welding and hot pressing at around 200℃. Featuring high insulation with a dielectric constant below 2.6, it effectively avoids short circuits, resists electrolyte vapor, and prevents increased resistance caused by corrosion and oxidation of copper/aluminum tabs.

Core Application 2: Battery Pack Assembly and System Protection

In battery pack assembly, it focuses on electrical safety and thermal management.

Insulation Isolation Between CellsPlaced between individual cells, it provides excellent insulation and flame retardancy up to UL94 V-0 grade, preventing short circuits and the spread of thermal runaway.

Internal Wiring and Component ProtectionIt wraps high-voltage wiring and connectors to provide high-temperature insulation and sealing, avoiding short circuits caused by electrolyte corrosion.

Thermal Management System Auxiliary MaterialWith a wide temperature resistance range of -196℃~300℃ and controllable thermal conductivity, it is used as the base material for heat insulation gaskets and thermal conductive sheets to balance the internal temperature of battery packs.

Overall Battery Pack SealingApplied to battery pack housing sealing, it resists external moisture ingress and corrosion from minor internal electrolyte leakage.

Special Requirement 1: Excellent Resistance to Various Electrolyte Components

Lithium battery electrolyte is highly corrosive, so chemical resistance is a critical performance indicator of PTFE high-temperature fabric:

Organic SolventsMain electrolyte components such as Ethylene Carbonate (EC) and Dimethyl Carbonate (DMC) are strong polar solvents. Ordinary plastics will swell or even dissolve when exposed, while PTFE remains completely unaffected.

Corrosive ElectrolytesLithium Hexafluorophosphate (LiPF₆), the core electrolyte salt, is sensitive to moisture and heat and easily decomposes to produce Hydrofluoric Acid (HF). HF is highly corrosive and can erode glass and most metals. PTFE high-temperature fabric delivers outstanding resistance to hydrofluoric acid and maintains stable performance in such harsh environments.

Electrochemical StabilityUnder high voltage and charge-discharge operating conditions inside batteries, PTFE features stable chemical properties, producing no side reactions with electrolyte and no catalytic decomposition of electrolyte.

Salt Spray Corrosion ResistanceElectrolyte leakage forms highly corrosive salt spray, against which PTFE high-temperature fabric shows excellent tolerance.

Special Requirement 2: Meeting Strict Battery Operating Conditions

Superior material properties are fundamental; long-term stability in actual battery environments must pass rigorous performance tests:

Electrolyte Immersion Aging TestThis is the most direct and critical verification method. Samples are immersed in simulated electrolyte and kept for days or weeks at room temperature or elevated temperatures such as 60℃ and 85℃. Qualified products show no surface blistering, delamination or dissolution with extremely low weight loss.

In summary, PTFE high-temperature fabric acts as protective covering, isolation barrier and conveying medium throughout lithium battery manufacturing. Whether enduring severe electrolyte corrosion inside cells or providing stable protection in high-temperature processes such as hot pressing and welding, its reliable performance is essential to guarantee production yield, operational safety and long cycle life of lithium batteries.

The above information is provided by Jiangsu Aokai New Materials Technology Co., Ltd.

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