High-capacity lithium-ion power battery for electromobiles and preparation method thereof

The invention discloses a high-capacity lithium-ion power battery for electromobiles and a preparation method thereof. The method comprises the following steps: 1) adding PVDF (polyvinylidene fluoride) 5130 into NMP (N-methylpyrrolidone), stirring to obtain positive pole glue, adding graphene into the positive pole glue, adding a positive pole active substance, adding NMP to regulate the solid content and viscosity, screening, taking out the screened material, spreading the screened material on the front and back surfaces of aluminum foil, and carrying out drying, rolling, stripping and tabletting to obtain the positive pole tablets; 2) adding CMC (carboxymethyl cellulose) and Super P into NMP, stirring to obtain negative pole glue, adding a negative pole active substance into the negative pole glue, adding SBR (styrene butadiene rubber) and NMP to regulate the solid content and viscosity, screening, taking the screened material, and finally, spreading the screened material on the front and back surfaces of copper foil to obtain negative pole tablets; 3) assembling the battery; and 4) carrying out formation. The high-capacity lithium-ion power battery for electromobiles has the advantages of excellent energy density, long service life, high cycle performance and high safety.