1. Product Positioning and Core Value
This product is a polytetrafluoroethylene (PTFE)-based binder specifically designed for dry-process lithium battery electrode manufacturing. As the "critical link" in dry electrode formation, it eliminates the need for organic solvents and can be directly and uniformly mixed with lithium battery positive/negative active materials (e.g., LFP, NCM, graphite, silicon-based materials) and conductive agents to form a stable electrode structure through high-pressure calendering. Compared with traditional PVDF binders for wet-process electrodes, PTFE dry-process binders address three core pain points of dry electrodes—"solvent-free formation," "interface bonding strength," and "cyclic durability"—by virtue of their excellent chemical resistance, high-temperature stability, and mechanical properties, providing key material support for the large-scale application of dry-process lithium battery technology.
2. Core Product Features
(1) Dry-Process Compatibility: Solvent-Free Formation, Simplified Production Process
PTFE binders exist in powder or dispersion form and do not require dilution with organic solvents such as NMP. They can be directly mixed with active materials and conductive agents via dry mixing methods (e.g., mechanical stirring, high-speed shearing) to form uniform material agglomerates, which are then calendered into electrode sheets. This feature perfectly aligns with the "zero-solvent" production requirement of dry electrodes, eliminating solvent recovery and high-temperature drying steps in wet-process. It reduces energy consumption in lithium battery electrode production by 40%-50% and avoids increased electrode interface impedance caused by solvent residues—lowering the interface impedance of dry electrodes by over 25% compared to wet-process electrodes.
(2) Superb Interface Bonding Strength: Ensuring Electrode Structural Stability
The unique fluorocarbon bond structure of PTFE molecular chains enables the formation of a continuous and dense bonding network during high-pressure calendering, tightly connecting active material particles to current collectors and between active material particles. Test data shows that dry LFP electrodes using this product achieve a peel strength of 1.8-2.2 N/m between the active material and aluminum foil current collector—30%-40% higher than that of other dry-process binders (e.g., SBR/CMC composite systems). Even during 10C high-rate charge-discharge or cycling of silicon-based anodes (volume expansion rate > 300%), the electrodes show no cracking or powder shedding, effectively preventing capacity fading caused by active material detachment.
(3) Excellent Chemical and High-Temperature Stability: Adapting to Harsh Lithium Battery Operating Conditions
Electrolyte Corrosion Resistance: PTFE exhibits extreme chemical inertness and can withstand long-term immersion in lithium battery electrolytes (e.g., carbonate solvent + lithium salt systems). After 1000 hours of immersion in electrolyte at 85℃, its bonding performance shows no significant degradation. This avoids the swelling and degradation of traditional PVDF binders under high voltage (>4.3V), which would otherwise lead to electrode structural failure.
Outstanding High-Temperature Stability: PTFE has a melting point of up to 327℃ and a long-term service temperature range of -200℃~260℃—far exceeding the normal operating temperature range of lithium batteries (-40℃~60℃) and the upper temperature limit under extreme conditions. During the thermal runaway early warning stage (temperature < 150℃), PTFE binders still maintain electrode structural integrity, delaying the spread of thermal runaway and improving lithium battery safety.
(4) Flexible Adjustability: Adapting to Multiple Active Materials and Electrode Designs
Broad Material Compatibility: Compatible with mainstream positive/negative active materials for lithium batteries, including lithium iron phosphate (LFP), ternary materials (NCM 523/622/811), natural/synthetic graphite, and silicon-based anodes (silicon-carbon, silicon-oxygen). For silicon-based anodes with high volume expansion, the flexible molecular chains of PTFE binders form an "elastic buffer layer" to relieve expansion stress, enabling silicon-based dry anodes to achieve a capacity retention rate of over 80% after 200 cycles—30% higher than PVDF wet-process electrodes.
Customizable Performance: By adjusting the molecular weight (1-10 million), particle size (1-10μm), and addition amount (1%-5%) of PTFE binders, the compaction density (e.g., 1.6-1.8 g/cm³ for LFP electrodes, 3.0-3.3 g/cm³ for NCM electrodes), porosity (10%-30%), and mechanical strength of electrodes can be flexibly adjusted to meet the design requirements of different types of lithium batteries (cylindrical, prismatic, pouch, blade batteries).
3. Key Technical Parameters
4. Application Scenarios and Advantages
(1) Power Battery Field
Suitable for dry-process electrodes of lithium iron phosphate (LFP) and ternary (NCM) lithium batteries used in electric vehicles. It improves battery fast-charging performance (10C fast-charging capacity retention ≥85%) and cycle life (LFP battery capacity retention ≥90% after 2000 cycles), while reducing electrode production costs by 15%-20%—meeting the "high safety, long life, and low cost" requirements of power batteries. For example, power batteries equipped with dry-process electrodes using this product achieve a discharge capacity retention rate of over 75% at -20℃—10% higher than wet-process electrodes—making them suitable for vehicle applications in cold northern regions.
(2) Energy Storage Battery Field
Addressing the "long cycle life and high stability" requirements of grid-scale and household energy storage lithium batteries, PTFE binders extend the cycle life of dry-process energy storage batteries to over 10,000 cycles (1C rate). The capacity fading rate during high-temperature cycling at 85℃ is <0.005% per cycle—much lower than that of wet-process energy storage batteries (0.01% per cycle). This significantly prolongs the service life of energy storage systems and reduces the total lifecycle cost.
(3) High Energy Density Battery Field
The flexibility and corrosion resistance of PTFE binders provide significant advantages in high energy density batteries such as silicon-based anodes and high-nickel ternary (NCM811/NCA) batteries. For instance, after applying this product to silicon-based dry anodes, the volume expansion rate can be controlled within 150%, with a capacity retention rate of 75% after 500 cycles. High-nickel ternary dry positive electrodes maintain a capacity retention rate of over 80% after 1000 cycles at 4.4V high voltage, breaking the application bottleneck of traditional binders in high energy density batteries.
5. Product Advantage Comparison (vs. Traditional Binders)
Comparison Dimension | This Product (PTFE Dry-Process Binder) | Wet-Process PVDF Binder | Other Dry-Process Binders (e.g., SBR/CMC) |
Solvent Requirement | Solvent-Free | Requires NMP Solvent | Requires Small Amount of Water (Some Systems) |
Electrolyte Resistance | Excellent (No Degradation After 1000h Immersion at 85℃) | Moderate (Prone to Swelling Under High Voltage) | Poor (Easily Decomposed by Electrolyte) |
Peel Strength (N/m) | 1.8-2.2 | 1.2-1.5 (Wet-Process Electrode) | 1.2-1.4 |
High-Temperature Stability (℃) | -200~260 | -150~150 | -40~80 |
Silicon-Based Anode Compatibility | Excellent (Buffers Expansion, Stable Cycling) | Poor (Cannot Withstand Volume Expansion) | Moderate (Prone to Cracking During Cycling) |
Production Energy Consumption (Relative Value) | 1 | 2.5-3 | 1.2-1.5 |
6. Services and Support
Customized Solutions: Provide personalized binder formula and addition amount recommendations based on customers' active material types (e.g., LFP/NCM/silicon-based) and electrode design parameters (areal density, compaction density) to help customers optimize dry-process electrode performance.
Technical Guidance: Offer full-process technical support from "material mixing - calendering formation - electrode testing," including mixing equipment selection and calendering process parameter adjustment, to assist customers in quickly implementing dry-process electrode production lines.
Quality Assurance: Product production adheres to the ISO9001 quality management system. Each batch of products is accompanied by an outgoing inspection report (including particle size, molecular weight, bonding strength, etc.) to ensure quality stability. A 1-year quality guarantee is provided, with free replacement or refund in case of quality issues.
R&D Cooperation: Relying on a professional R&D team, we can jointly develop next-generation high-performance PTFE dry-process binders (e.g., low-addition, high-elasticity modified PTFE) with customers to meet the future needs of high energy density and ultra-fast charging lithium batteries.
