Leading Lithium Battery Equipment Supplier

Material preparation
Positive/negative electrode materials: such as lithium cobalt oxide (LCO), ternary materials (NCM), graphite, etc., need to be ground to micron level (particle size ≤ 10 μm).
Electrolyte: commonly used LiPF6/carbonate solution, water content needs to be <20 ppm.
Current collector: aluminum foil (thickness 10-20 μm) for positive electrode, copper foil (8-15 μm) for negative electrode.
Electrode preparation
Slurry preparation: active material, conductive agent (such as Super P), binder (such as PVDF) are mixed in proportion (such as 90:5:5), and solvent (NMP or water) is added to stir into a uniform slurry.
Coating and drying: The slurry is evenly coated on the current collector (wet film thickness 100-200 μm), vacuum dried at 80-120℃, and the solvent is removed.
Roller pressing and slitting: Use a small roller press to compact the electrode sheet (positive electrode 2.5-3.5 g/cm³) and cut it into the required size (such as 20×20 mm).
Battery assembly
Stacking/winding: Manual stacking is commonly used in the laboratory. The positive electrode, separator (such as Celgard), and negative electrode are stacked in sequence, and the alignment error is less than 0.5 mm.
Packaging and injection: Pack soft pack or button batteries in a glove box (H₂O/O₂＜1 ppm), inject electrolyte (2.5-3.5 g/Ah), and let it stand for 12 hours to soak.
Sealing: The soft pack battery is sealed with a heat sealer (temperature 150-180℃) to ensure no leakage.
Activation and testing
Formation: Charge to 3.0V with a small current of 0.02C for the first time to form an SEI film.
Cycle test: 0.5C charge and discharge, record capacity, efficiency and attenuation data.
Characterization and analysis: SEM was used to observe the electrode morphology, XRD was used to analyze the crystal structure, and EIS was used to test the interface impedance.