EV Battery & Energy Storage
Complete EV Battery Chemical Supply
The global EV battery market demands ultra-pure process chemicals for electrolyte formulation and cathode/anode slurry preparation. PureTech supplies battery-grade DMC, EMC, DEC, NMP, and ethanol with the metal purity and moisture control required by premium cell manufacturers.
Key Challenges
What Makes EV Battery & Energy Storage Chemistry Demanding
Water Contamination
Even 20 ppm water in DMC causes LiPF₆ hydrolysis generating HF that attacks cathode surface and degrades SEI layer. G5 DMC (≤10 ppm H₂O) prevents this reaction.
Metal Impurities
Fe and Ni above 0.1 ppb in electrolyte solvents catalyze electrolyte decomposition and deposit as metallic particles that trigger internal shorts.
Chloride Control
Chloride ions (Cl⁻) from DMC synthesis react with LiPF₆ to accelerate decomposition and corrode stainless steel cell components. G5 DMC specifies Cl⁻ ≤50 ppb.
NMP Purity
Metal contamination in NMP transfers to PVDF binder film and cathode active material, creating trap sites that reduce cycle life. G5 NMP (<0.05 ppb Fe/Ni) for NMC-811 premium cells.
Product Portfolio
Chemicals for EV Battery & Energy Storage
Process Mapping
Step-by-Step Chemical Guide
PVDF Dissolution
NMP G4/G5Dissolve PVDF binder in anhydrous NMP at 60–80°C for 4–8 hours before cathode slurry preparation.
Cathode Slurry Mix
NMP G4NMC-811 or LFP active material + carbon black mixed into PVDF/NMP solution. Target viscosity 3,000–8,000 mPa·s.
Electrolyte Mix
DMC + EMC + EC1.0 M LiPF₆ in EC/DMC/EMC (1:1:1 v/v). All solvents ≤10–20 ppm H₂O before LiPF₆ addition.
Cell Assembly Clean
IPA / Ethanol G3Cell housing and electrode tab cleaning before assembly in dry room (dew point ≤-40°C).
FAQ
Frequently Asked Questions
What DMC grade is required for NMC-811 EV battery electrolyte?
NMC-811 premium cells require G4 DMC (≤20 ppm H₂O, ≤0.5 ppb total metals, ≤100 ppb Cl⁻) as minimum. For high-cycle-life cells (>1,000 full cycles), G5 grade (≤10 ppm H₂O, ≤50 ppb Cl⁻) is specified by leading cell manufacturers.
Why is Fe and Ni control critical in battery chemicals?
Fe contamination above 0.1 ppb causes metallic iron deposition on graphite anodes during charging, nucleating lithium dendrites over hundreds of cycles. G5 NMP and DMC with <0.05 ppb Fe/Ni is specified for long-cycle-life premium cells.
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