As a new foreign trade service provider driven by technological transformation and export business, HiSiaddi has built a "1+2+3+4=1" service system and can supply LiFSI sourced from multiple well-known original manufacturers. Equipped with R&D capabilities, HiSiaddi frequently collaborates with factories on technology transfer and accurately captures market demands to resolve customized LiFSI product requirements for clients. Below is a case of HiSiaddi addressing customized LiFSI production demands.
Contact HiSiaddi customer service for more customized service support.
The client is BATTERY TECH GmbH, a premium power battery enterprise based in Munich, Germany, and a top-tier European new energy battery manufacturer. It focuses on R&D and production of high-nickel ternary fast-charging batteries and solid-state battery electrolytes, supplying premium European automakers and high-end energy storage projects. The company complies with EU REACH, CE, ISO 9001, ISO 14001 and automotive-grade IATF 16949 standards, requiring ultra-high-purity, low-impurity customized lithium salt LiFSI, qualifying as an ultra-high-end customized client.
Battery-grade ultra-high-purity lithium bis(fluorosulfonyl)imide (LiFSI) with core specifications: purity ≥99.95%, water content ≤50ppm, free acid ≤10ppm, metal ions (K/Na/Ca/Fe) ≤1ppm, chloride ion ≤5ppm. Special customized requirements include:
1. Low-viscosity anhydrous solvent system compatible with solid-state batteries;
2. Custom particle size distribution (D50=15μm, narrow distribution);
3. Zero fluorine residue and low sulfur content;
4. Small-batch multi-batch delivery (initial order: 5 tons split into 5 batches);
5. Full test reports certified by German GLP laboratories.
Domestic European LiFSI production capacity is limited with a high price of approximately RMB 220,000 per ton, and local suppliers cannot meet the combined demands of ultra-high purity, customized particle size and low-viscosity solvent systems. Japanese suppliers can deliver ultra-high-purity products yet feature poor customization flexibility, long lead times (over 45 days) and strict technical confidentiality clauses. This was the client’s first attempt at Chinese procurement, yet 3 contacted factories all failed to meet standards due to insufficient purity, unstable particle size control, incompatible solvent systems and inadequate small-batch customized production capacity. The client faced risks of delayed R&D projects, broken supply chains and massive R&D losses, thus entrusting HiSiaddi to deliver customized mass production within 20 days with 100% compliance with all indicators.
LiFSI production covers multiple reaction steps including chlorination, fluorination, salt formation, dehydration, crystallization and drying. Raw materials and production processes easily introduce impurities such as potassium ions, sodium ions, iron ions, chloride ions, sulfate radicals, water and free acid. The client’s requirements (metal ions ≤1ppm, water ≤50ppm, free acid ≤10ppm) far exceed standard battery-grade thresholds (metal ions ≤5ppm, water ≤100ppm). Traditional recrystallization and vacuum drying cannot meet the standards; multi-stage molecular distillation, supercritical fluid extraction and ion exchange deep purification are required, demanding heavy equipment investment and extremely precise process control.
LiFSI crystal particle size directly impacts electrolyte solubility, ionic conductivity and battery cycling stability. The client required D50=15μm±2μm with span ≤1.2, while conventional crystallization yields wide particle size distribution (D50=20–50μm, span ≥1.8) accompanied by severe batch fluctuations, agglomeration and poor flowability. Precise temperature-controlled crystallization, crystal seed induction and particle size classification screening are necessary with dynamic fine-tuning of process parameters, making stable small-batch production extremely difficult.
The client required LiFSI dissolved in a low-viscosity mixed solvent of dimethyl carbonate (DMC) and ethyl methyl carbonate (EMC), with water content ≤50ppm and no hydrolysis or precipitation during long-term storage. LiFSI readily absorbs moisture and hydrolyzes to generate HF and fluorosulfonylimide, raising free acid levels, reducing purity and discoloring solvents. Conventional packaging and storage conditions fail to satisfy requirements, mandating anhydrous and oxygen-free production environments, special hermetic packaging and full cold-chain transportation.
Most domestic LiFSI manufacturers operate thousand-ton continuous production lines focused on standardized mass production. Small-batch customized runs (1 ton per batch) incur high equipment switching costs, volatile process parameters, unstable purity and particle size, and extended lead times (over 30 days). Most factories refuse small customized orders, leaving the client unable to source compliant products despite sufficient budget.
HiSiaddi assembled a dedicated team of LiFSI technical specialists, purification engineers, crystallization process technicians, quality control supervisors and compliance experts, adopting a 10-step workflow: Demand Disassembly → Technical Route Design → Factory Screening → Custom Process Development → Lab Trials → Pilot Trials → Mass Production → Full Testing → Delivery → Post-Delivery Technical Support, achieving customized mass production within 20 days with 100% compliance of all indicators.
· Purity control: Adopt fluorosulfonic acid synthesis combined with multi-stage molecular distillation, supercritical CO₂ extraction and ion exchange resin deep metal removal to replace traditional recrystallization, ensuring purity ≥99.95%, metal ions ≤1ppm and chloride ion ≤5ppm;
· Particle size regulation: Implement low-temperature precise temperature-controlled crystallization (5℃±0.5℃), nano crystal seed induction, inert gas shielding and air flow classification screening to strictly control D50=15μm±2μm and span ≤1.2;
· Solvent system matching: Deploy anhydrous and oxygen-free reaction kettles, molecular sieve deep dehydration (water ≤30ppm) and nitrogen sealing to match the DMC:EMC=3:7 low-viscosity solvent with full nitrogen protection to eliminate hydrolysis;
· Small-batch production: Select manufacturers with flexible pilot lines (100–500kg per batch) and formulate batch production plans for 5 tons split into 5 separate batches, with independent testing, packaging and traceability for each batch.
HiSiaddi audited 8 domestic LiFSI manufacturers, eliminating 4 lacking flexible capacity, 2 with insufficient purity control and 1 with strict technical confidentiality restrictions. Kangpeng Technology, an industry leader in solid LiFSI with flexible pilot production lines, was selected as the core production base. An exclusive customized production agreement was signed to lock 5 tons of production capacity within 20 days, with clear specifications for technical parameters, quality standards, batch delivery and liability for breach of contract.
· Lab Trials (3 days): Conduct 5kg small-scale trials following the customized technical route, optimizing 12 key parameters including reaction temperature, crystallization rate, extraction pressure and ion exchange flow rate. After 3 rounds of iteration, test results reached purity 99.97%, water content 32ppm, free acid 7ppm, metal ions 0.8ppm and D50=14.8μm, exceeding all target indicators;
· Pilot Trials (7 days): Scale up to 500kg per batch pilot runs to verify process stability, equipment compatibility and batch consistency. A full-process quality control system was established (raw material inspection → in-process monitoring → finished product full testing → packaging inspection). All 3 pilot batches fully met standards without batch fluctuations.
Mass production was executed in 5 separate 1-ton batches under full nitrogen protection, anhydrous/oxygen-free operation and precise temperature control. 3 random samples were drawn from each batch for full-indicator testing.
A German GLP-certified laboratory conducted 28 comprehensive tests covering purity, water content, free acid, metal ions, anions, particle size distribution, viscosity and storage stability, issuing dual-language English and German test reports fully complying with all customized client specifications.
· Custom packaging: 25kg stainless steel hermetic drums lined with PTFE anti-seepage film, filled with high-purity nitrogen and double-sealed to prevent moisture absorption and hydrolysis. Each drum was labeled with customized batch number, particle size distribution, purity indicators, test report ID and storage conditions (-10℃~25℃, dry and shaded environment);
· Cold-chain transportation: Dedicated low-temperature dangerous goods trucks with constant temperature control at 0–10℃ and nitrogen protection, with full GPS tracking. Goods safely arrived at the Munich factory within 3 days without damage, leakage or hydrolysis.
· Purity: 99.97% (target ≥99.95%)
· Water content: 32ppm (target ≤50ppm)
· Free acid: 7ppm (target ≤10ppm)
· Metal ions: 0.8ppm (target ≤1ppm)
· Chloride ion: 3ppm (target ≤5ppm)
· Particle size distribution: D50=14.8μm, span=1.15 (target D50=15μm±2μm, span ≤1.2)
· Solvent viscosity: 0.85mPa·s (low-viscosity requirement satisfied)
· Storage stability: No hydrolysis, precipitation or purity degradation after 6 months of storage
· Lead time: 20 days (over 45 days for European local suppliers, over 30 days for Japanese suppliers)
· Unit price: RMB 168,000 per ton (RMB 220,000 per ton for European local suppliers, a 23.6% cost reduction)
· Flexible delivery: 5 tons split into 5 batches for on-demand shipment, matching the client’s R&D timeline
Client comment: “HiSiaddi resolved our unachievable ultra-high-purity customization challenges with professional, efficient and rigorous delivery within 20 days. Their technical strength and service capacity far exceeded expectations, making them our most trusted Chinese customized partner.”
A 3-year long-term customization agreement was signed with annual procurement volume increased to 50 tons. The client also entrusted HiSiaddi with procurement agency services for high-end customized products including solid-state battery electrolytes and high-nickel cathode materials. HiSiaddi was incorporated into the client’s global core supply chain and awarded the Annual Best Supplier title.
A complete ultra-high-purity LiFSI customized production standard system was developed, covering full links including technical routes, process parameters, quality control, packaging logistics and testing specifications. This replicable customization model can be extended to high-end lithium salts such as LiBOB, LiDFOB and LiBF₄, supporting Chinese new energy material manufacturers to capture the global high-end customized market.
For overseas mid-to-high-end clients purchasing ultra-high-purity customized LiFSI, four core pain points—purity control, particle size customization, solvent compatibility and flexible small-batch production—directly determine R&D project success and product performance. Conventional domestic factories lack sufficient technical capabilities, flexible production capacity and customization experience, rendering them unable to meet strict high-end client requirements and leaving customized demands unfulfilled long-term.
Backed by profound industry resources, professional technical teams, efficient execution and end-to-end quality control, HiSiaddi resolved four core customization challenges within 20 days:
1. Ultra-high-purity purification: Innovative multi-stage purification process achieving ppb-level impurity control with purity exceeding 99.97%;
2. Precise particle size control: Custom crystallization and screening processes delivering narrow-distribution D50=15μm;
3. Low-viscosity anhydrous solvent: Full nitrogen protection eliminating hydrolysis for solid-state battery compatibility;
4. Flexible small-batch production: Locked pilot line capacity for 5 tons split into 5 batches with on-demand delivery, cutting lead time by over 50%.
This service not only helped the client break technical bottlenecks, secure R&D progress and lower procurement costs, but also won deep trust from high-end clients through professional, efficient and reliable customized services to build long-term strategic partnerships. Meanwhile, a replicable high-end lithium salt customized service system was established, supporting the high-end globalization of China’s new energy material industry.
Contact HiSiaddi customer service for more customized service support.
+86-13120989737 
info@hisiaddi.com 
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