As a new foreign trade service provider driven by dual engines of technology transformation and foreign trade services, HiSiaddi has established a "1+2+3+4=1" service system and can supply original products from multiple well-known brands of polyvinylidene fluoride resin. As a technology-driven foreign trade enterprise, HiSiaddi has repeatedly resolved customized demands for polyvinylidene fluoride resin products through technology transformation cooperation with manufacturers and accurate insight into market demands. Below is a case of HiSiaddi addressing customized requirements for polyvinylidene fluoride resin.
For more customized service inquiries, please contact HiSiaddi customer service.
HiSiaddi tackled full-chain technical challenges of customized development and realized mass procurement of localized exclusive formulas.
The purchasing enterprise is EnerGreen Battery GmbH based in North Rhine-Westphalia, Germany, a German specialized and sophisticated power battery manufacturer with 18 years of deep engagement in R&D and manufacturing of square cells for high-end European passenger vehicle power lithium batteries and energy storage. It serves as a designated cell supplier for Mercedes-Benz light hybrid vehicles and local German industrial and commercial energy storage projects. Its products fully comply with stringent access standards including the EU Battery Regulation, REACH and UN38.3. The enterprise has long placed fixed orders for lithium battery-specific PVDF binder resins from Arkema Kynar and Solvay Solef series, ranking as a top mid-to-high-end buyer in the new energy fluororesin sector.
Affected by three major factors – continuous price hikes of local European chemical raw materials, high minimum order thresholds for custom modified PVDF from overseas fluorochemical giants (minimum 5 tons per customization with delivery cycles over 75 days), and fluctuations in European fluorine raw material supply chains due to geopolitical tensions between Russia and Ukraine – the client launched a screening process for localized PVDF alternative supply chains in 2025. Recommended by the German Fluoroplastics Industry Association, the client connected with HiSiaddi New Materials Foreign Trade based in Shanghai and put forward demands for customized modified PVDF resin dedicated to high-voltage NCM811 high-nickel cathode systems.
Different from general lithium battery PVDF powder available on the market, this customized PVDF serves as a cathode slurry binder for NCM811 high-nickel materials. The client’s original imported grades suffered three major mass production pain points: high-temperature electrolyte swelling, electrode sheet peeling during calendering, and slurry gelation after standing. HiSiaddi was required to collaborate with domestic fluororesin manufacturers to develop exclusive polymer modification customizations. The initial customized trial order was 1,200 kg, followed by an annual framework procurement volume of 8 tons. Product indicators were benchmarked against high-end modified grades from Arkema, with a strict ban on supply mixed with low-grade general PVDF for industrial or coating applications.
The client previously independently contacted 3 domestic PVDF manufacturers for sample customization, yet encountered successive issues including out-of-control formula modification, excessive molecular weight distribution, insufficient batch stability, and unfeasible mass production processes. After 3 months of trials, over RMB 100,000 spent on sample testing fees, and 5 failed bench-scale trials failing to meet German cell production line standards, the customization project stalled. The client terminated direct cooperation with manufacturers and fully entrusted HiSiaddi to coordinate the full process of formula customization, process rectification and mass production implementation.
High-nickel NCM811 cathode systems operate under special working conditions: ultra-fine cathode powder particle size and strongly alkaline environments. Conventional linear PVDF delivers insufficient binding force, while over-branched PVDF causes sharp viscosity surge of slurry and coating strip breakage. The client specified controllable moderately branched modified PVDF with molecular weight controlled between 320,000 and 360,000, molecular weight distribution coefficient ≤1.8, and branch content ranging from 0.8% to 1.2%.
Previously contacted domestic manufacturers only mass-produced standardized general grades with fixed polymerization process parameters, unable to fine-tune the feeding ratios of emulsion polymerization additives and initiators accurately. Their three formula adjustments all deviated from target indicators, failing to match the client’s slurry preparation process – either insufficient branching leading to poor adhesion or excessive branching triggering slurry gelation.
The client’s high-speed coating machine requires PVDF with median particle size D50 of 18~22 μm and particle size span less than 1.3. General domestic PVDF powder usually has a particle size span exceeding 2.0 with mixed coarse and fine particles. After slurry preparation, fine particles agglomerate while coarse particles settle, resulting in pinholes and exposed foil on electrode sheets and excessive capacity attenuation during battery cycling tests. The manufacturers’ original crushing and screening equipment was general chemical machinery without refined lithium-grade classification production lines, making customized particle size grading impossible.
High-end lithium battery PVDF demands VDF monomer raw material purity ≥99.995%. Trace residual unsaturated monomers and metal ion impurities decompose and generate gas under high-temperature cell cycling, causing soft-pack cells to swell and be scrapped. Third-party testing of previous samples found residual monomers exceeding the standard by 12 ppm and iron ions exceeding the limit by 0.3 ppm. The manufacturers lacked full-item impurity screening for incoming raw materials and adopted general processes for polymerization impurity removal, failing to meet high-purity control standards for power batteries.
Domestic leading PVDF manufacturers face high production line switching costs for custom modification, with a standard minimum customization order of 3 tons. The client’s initial trial production only required a small batch of 1,200 kg, so manufacturers were reluctant to independently adjust polymerization formulas and production line parameters due to production cost considerations. While small and medium-sized factories accepted small orders, their weak process control led to unstable batch quality. The client fell into a dilemma: large manufacturers rejected small orders, yet small factories delivered substandard quality.
HiSiaddi set up a dual technical team covering fluororesins and lithium battery materials. Referencing the client’s COA reports of benchmark Arkema imported products, slurry preparation process parameters and cell cycle test data, the team disassembled the molecular structure indicators of original imported PVDF. Collaborating with the R&D centers of domestic listed leading fluorochemical enterprises, HiSiaddi optimized the customization scheme from the source of emulsion polymerization: First, adjust the polymerization system: adopt high-purity imported VDF monomers, add limited functional thiol modifiers at precise quantitative intervals in the middle of polymerization reactions to accurately control molecular branching sites and avoid random over-branching. After 4 rounds of fine-tuning polymerization bench trials, the product branch content was stably controlled at 1.02%, perfectly falling within the client’s target range of 0.8%~1.2%. Second, strictly control molecular weight: implement segmented temperature-controlled polymerization with gradient addition of initiators in three stages and precise control of reaction termination nodes. The final measured average molecular weight reached 342,000 with a molecular weight distribution coefficient of 1.72, satisfying the mandatory standard of ≤1.8. Third, customize post-treatment processes: adopt low-temperature negative-pressure spray drying in the drying section to avoid molecular chain breakage caused by high temperatures, and deploy lithium battery-specific air flow classification equipment for precise powder particle size screening. The finished product achieved stable D50 of 20.1 μm and particle size span of 1.21, meeting the client’s coating particle size requirements.
First, pre-screen incoming raw materials: HiSiaddi required manufacturers to establish incoming inspection ledgers for lithium-grade raw materials. Each batch of incoming VDF monomers undergoes full-component GC gas chromatography testing, while metal ions are screened via ICP mass spectrometry to eliminate raw materials with excessive impurities, ensuring monomer purity ≥99.997% from the source. Second, full-process anti-contamination production: a dedicated Class 100,000 clean polymerization workshop was used for customized PVDF production. All production equipment was polished and passivated to prevent metal impurities from equipment abrasion, and an additional alcohol washing extraction section was added to remove trace residual monomers. Third-party SGS testing confirmed residual monomers in finished products <3 ppm, with all heavy metal ions below EU Battery Regulation limits, completely eliminating cell swelling risks. Third, domestic pre-production verification: HiSiaddi coordinated domestic leading lithium battery pilot production lines to prepare slurry, coat and assemble soft-pack cells using customized PVDF paired with the client’s identical NCM811 cathode materials. After 1,000 cycles of aging tests, no electrode sheet peeling or swelling occurred, and slurry showed no gelation after standing at room temperature for 72 hours. All performance indicators matched the imported Kynar grades.
HiSiaddi abandoned small and medium-sized processing plants with weak process control, and finally selected two domestic leading mid-to-high-end lithium-grade PVDF manufacturers: one with integrated VDF monomer synthesis capacity and dedicated lithium battery modification production lines, whose products are long-term supplied to domestic listed top power battery manufacturers; the other capable of flexible small-batch customized production line transformation.
Leveraging HiSiaddi’s long-term supply chain cooperation resources, production line gaps were coordinated for split batch insertion production, breaking the original 3-ton minimum customization order threshold. Independent production was arranged for the client’s 1,200 kg customized raw materials. While ensuring product quality benchmarked against international top brands, the unit procurement price of customized raw materials dropped by 31.5% compared with imported Arkema products. Meanwhile, HiSiaddi signed an exclusive formula confidentiality agreement with manufacturers, stipulating this modified PVDF formula is exclusively supplied to EnerGreen Germany to prevent formula leakage.
In accordance with the EU New Battery Regulation, REACH-SVHC and Germany’s local GBL chemical import specifications, HiSiaddi handled all compliance documents on a one-stop basis: entrust EU notified bodies to issue full-item REACH SVHC test reports, RoHS hazardous substance tests, trilingual (Chinese, English, German) MSDS battery material safety data sheets, product material traceability lists and original factory COA factory inspection reports. Advance pre-registration of chemicals in Germany was completed. Customized products were packed with moisture-proof high-purity aluminum foil vacuum packaging, with EU compliance marks printed on outer cartons, and shipped via constant-temperature containerized ocean freight to avoid customs detention risks for chemical goods in Germany.
1. Smooth delivery and commissioning of initial customized order: The 1,200 kg exclusive modified PVDF was produced and shipped within 41 days. Upon arrival at the factory in North Rhine-Westphalia, Germany, full-batch incoming re-inspection confirmed all physical, chemical and electrochemical indicators met standards. Mass production lines of the client adopted the material in bulk. The yield of NCM811 cell electrode sheets rose from 92.3% using general domestic materials to 98.7%, and the defective rate of high-temperature cycle swelling was reduced to below 0.1%, fully replacing original imported Arkema raw materials.
2. Signing of annual long-term framework agreement: After customized sample mass production verification passed, both parties signed an annual procurement framework agreement, stipulating a total annual purchase volume of 8 tons of exclusive modified PVDF divided into four batches. Later, the client developed a new generation of high-nickel 9-series cathode cells and entrusted HiSiaddi with formula customization and development of new ultra-high toughness modified PVDF products.
3. Client supply chain expansion: EnerGreen included HiSiaddi as its core Chinese fluororesin procurement service provider. Relying on its European new energy industry resources, the client referred two leading European energy storage battery enterprises from the Netherlands and Austria to HiSiaddi for PVDF customized procurement, continuously expanding the market for localized alternative raw materials for high-end European lithium batteries.
The product of this project is high-end customized modified PVDF resin dedicated to high-nickel power batteries, directly applied to cells designated for supporting European vehicle manufacturers. Its technical indicators, environmental access standards and electrochemical performance thresholds are far higher than low-grade general PVDF raw materials for architectural coatings and ordinary home appliance anti-corrosion applications. Breaking the traditional foreign trade model limited to spot goods resale, HiSiaddi relied on dual professional capabilities in fluorochemical engineering and new energy materials to resolve overseas mid-to-high-end clients’ customized pain points through the full chain of formula R&D, process optimization, production line coordination and export compliance. It built differentiated foreign trade service advantages through customized R&D support and realized localized customized implementation of overseas high-end fluororesins.
For more customized service inquiries, please contact HiSiaddi customer service.
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