Method for making electric core of lithium ion battery
A lithium-ion battery and cell technology, which is applied in the field of lithium-ion battery cell preparation, can solve the problems of increased battery internal resistance, shortened service life, and reduced battery capacity, so as to improve production efficiency, stable and reliable performance, and increase service life Effect
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[0012] Example: Preparation of adhesive polyvinylidene fluoride glue. Polyvinylidene fluoride powder is diluted with NMP (N-methylpyridone) or acetone to prepare polyvinylidene fluoride glue with a content of about 8%. Use commercially available PP, PE three-layer composite or single-layer PP (void ratio 45%-50%) diaphragm, cut the width 1mm---1.5mm wider than the width of the pole piece to make the diaphragm, and on the surface of the pole piece , The coating surface density is 5mg / cm 2 The prepared polyvinylidene fluoride glue is baked at a temperature above the volatilization point of the solvent by two or three passes (for example, NMP is used as the solvent at 110°C, and acetone is used as the solvent at 45°C), and the solvent is removed by drying. Lay the diaphragm and the pole piece neatly, line the top and bottom with PET protective film, and put it on a thermal compound machine at 125°C and a roll pressure of 200N to form a whole.
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