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 propose LiFSI formula optimization and application improvement solutions. Below is a consulting case of HiSiaddi’s LiFSI formula optimization service.
Contact HiSiaddi customer service for more formula optimization consulting support.
The client is KOREA ENERGY MATERIALS Co.,Ltd, a premium new energy material enterprise headquartered in Seoul, South Korea. It specializes in R&D and manufacturing of high-end power battery and energy storage battery electrolytes, supplying top Korean automakers and overseas energy storage projects. The company complies with IEC 62619, ISO 9001, REACH and battery-grade high-purity material control standards, imposing strict requirements on lithium salt purity, compatibility, cycling stability and adaptability to on-site production conditions, qualifying as a typical overseas mid-to-high-end client.
The client regularly purchases battery-grade LiFSI with an annual procurement volume of 80 tons for ternary power battery electrolyte formulation. The established formula requires that after compounding LiFSI with carbonate solvents and additives, the electrolyte achieves ionic conductivity ≥12.5 mS/cm, capacity retention ≥88% after 1000 cycles at room temperature, and no obvious gas generation or discoloration/precipitation after 7 days of storage at 85℃.
After switching to domestically produced LiFSI, the client encountered consecutive technical issues: low electrolyte ionic conductivity, severe gas generation under high temperature, rapid cycle life attenuation, and severe moisture absorption and agglomeration during batching, resulting in reduced finished battery yield and forced production line load reduction. The client’s internal process team failed to fundamentally resolve the issues through repeated ratio and environmental parameter adjustments, thus entrusting HiSiaddi with problem diagnosis, raw material formula optimization, on-site production process rectification and long-term technical support.
HiSiaddi collaborated with a material testing laboratory to review samples, combining raw material indicators, compound formulas and on-site production environments to identify four categories of technical issues and their root causes:
Finished electrolyte only reached 11.2 mS/cm, below internal control standards. Root cause: Excess trace organic residues and low-molecular fluoride impurities in LiFSI disrupted ion conduction pathways. Additionally, excessively wide particle size distribution with high fine powder content caused uneven dissolution rates in solvents and unbalanced local concentrations, lowering overall ionic conductivity.
Turbidity and micro-bubbles appeared in electrolytes during 85℃ high-temperature storage testing, leading to excessive internal gas generation in corresponding batteries. Root cause: Elevated free acid content (18ppm, exceeding the client’s internal limit of ≤12ppm). Free acid triggered slow hydrolysis of LiFSI to generate corrosive gases such as hydrogen fluoride; hydrolysis products further induced solvent side reactions, causing system discoloration and gas generation.
Capacity retention only reached 76% after 500 battery cycles, far below the 88% target. Root cause: Total alkali metal ion content (potassium, sodium etc.) in raw materials reached 3.2ppm. Such impurities continuously damage electrode interfacial films and accelerate active material aging, drastically shortening battery cycle life.
Despite temperature and dehumidification controls in the client’s batching workshop, LiFSI rapidly absorbed moisture and agglomerated after unpacking, requiring additional crushing procedures that increased working procedures and material loss. Root cause: Excess free water adsorbed on raw material particle pores (water content 85ppm), with untreated hydrophobic particle surfaces creating high sensitivity to ambient water vapor. Minor structural defects in original packaging also caused slow moisture absorption during storage and transportation.
HiSiaddi assembled a cross-functional team of lithium salt R&D specialists, electrolyte application engineers, production process technicians and on-site technical service personnel, implementing rectifications across five modules: raw material purification & formula modification, precise indicator adjustment, application process optimization, packaging upgrade and standardized implementation. Full-process verification and stable mass production were achieved within 20 days.
· Deep removal of free acid and organic impurities: Optimize neutralization and rectification processes with dedicated acid neutralization additives and negative-pressure high-temperature devolatilization to stabilize free acid at 8–10ppm, completely cutting off the root cause of hydrolysis and gas generation. Multi-stage rectification eliminates low-molecular organic impurities to improve ion conduction performance.
· Deep metal ion removal: Upgrade ion exchange purification procedures with special chelating resins for targeted adsorption of alkali and heavy metal ions, reducing total K, Na, Fe and other metal ions to ≤1.0ppm to protect electrode interfaces and enhance cycling stability.
· Particle size system optimization: Adjust crystallization and screening parameters to narrow particle size distribution and reduce ultra-fine powder proportion, enabling more uniform dissolution of LiFSI in carbonate solvents and eliminating local concentration imbalance.
Add an inert hydrophobic coating process in the final production stage to form an ultra-thin protective layer on particle surfaces and block water vapor adsorption. Simultaneously optimize vacuum drying parameters to strictly control product water content ≤45ppm, greatly improving environmental tolerance and compatibility with the client’s existing dehumidified workshop conditions.
Based on modified LiFSI physical parameters, provide the client with electrolyte ratio optimization solutions: fine-tune main solvent proportions and compatible additive dosages without altering core mainstream processes to strengthen system stability and maximize LiFSI conductive performance.
· Environmental control: Clarify batching workshop temperature and humidity standards (18–22℃, humidity ≤20%), recommending local nitrogen shielding devices for unpacking and feeding stations;
· Feeding sequence: Standardize material addition order by pre-mixing solvents first before gradual LiFSI input, extending low-speed stirring duration to ensure full dissolution and avoid agglomeration;
· Storage management: Establish raw material zoning storage rules with first-in-first-out protocols, matching single unpacking volumes to daily consumption to minimize raw material exposure time.
Replace ordinary coated iron drums with double-sealed nitrogen-filled packaging, fitted with sealing gaskets and snap fasteners for drum mouths. Additional moisture-proof wrapping film is applied to outer packaging to eliminate moisture absorption during storage and transportation and maintain stable finished product indicators throughout the supply chain.
Mandate fixed process parameters for production lines, with full testing of five core indicators (water content, free acid, metal ions, particle size, dissolution rate) for every batch with complete test reports. Implement batch benchmarking mechanisms to strictly limit indicator fluctuations within the client’s internal control thresholds.
Optimized LiFSI achieved water content 42ppm, free acid 9ppm and total metal ions 0.9ppm, with all key indicators exceeding the client’s internal control standards and uniform particle size distribution.
· Electrolyte ionic conductivity stabilized at 13.1 mS/cm to meet production requirements;
· No electrolyte discoloration or obvious gas generation after 7 days of 85℃ high-temperature storage, satisfying thermal stability standards;
· Capacity retention reached 90.2% after 1000 room-temperature battery cycles, exceeding original targets;
· No moisture absorption or agglomeration during feeding, eliminating secondary crushing procedures, cutting raw material loss by 3% and lifting production efficiency by 12%.
The client’s production line resumed full-load operation, restoring finished battery yield to previous high levels, completely resolving production reduction and rework issues and enabling on-time delivery to downstream customers.
The client highly recognized HiSiaddi’s problem diagnosis capabilities, formula optimization expertise and efficient delivery service, retaining the full 80-ton annual procurement order. A regular technical communication mechanism was established, with subsequent lithium salt selection and formula debugging for new high-voltage and low-temperature electrolytes prioritized for cooperation with HiSiaddi.
For overseas mid-to-high-end lithium battery manufacturers using LiFSI, excessive raw material impurities, improper particle size distribution, high moisture absorption, mismatched compound formulas and non-standard on-site operations easily trigger cascading issues including low electrolyte conductivity, high-temperature gas generation, rapid battery cycle attenuation and production agglomeration. Most raw material factories only supply standardized products without end-user electrolyte application experience, making them unable to resolve technical bottlenecks covering both raw materials and application processes.
Leveraging dual technical accumulation in lithium salt R&D and downstream electrolyte applications, HiSiaddi implemented full-link rectification: upgrading raw material purification, modification and packaging at the source, while optimizing compound formulas and on-site operating standards for end-use applications. This one-stop solution resolved technical bottlenecks spanning upstream and downstream links. The service not only stabilized product quality, restored production capacity and reduced material losses for the client, but also deepened cooperation through comprehensive technical service capabilities, continuously supporting domestically produced high-end lithium salts to secure positions in the global mid-to-high-end lithium battery supply chain.
Contact HiSiaddi customer service for more formula optimization consulting support.
+86-13120989737 
info@hisiaddi.com 
English
