Positive electrode material of lithium-ion battery and preparation method therefor
摘要
說(shuō)明書
The BET specific surface area testing was operated with a Tristar II 3020 analyzer from Micromeritics, US. The sample was pretreated at conditions of a temperature of 300° C. and a degassing time of 1 hour. The BET specific surface area and the pore size of the sample were calculated according to the BET equation.
2. Testing for the change in specific surface area under pressure.
3 g of the sample was subjected to pressures of 0 tons, 1.5 tons, 2.5 tons, 3.5 tons and 4.5 tons respectively to obtain the compressed samples. The above testing for BET specific surface area was repeated with each of the compressed samples, to obtain specific surface area data under different pressures, for use in characterizing the change in specific surface area under pressure.
3. Testing for battery performances.
3.1 Preparation of battery samples:
The obtained positive electrode material, conductive carbon black and polyvinylidene fluoride (PVDF) were mixed in a mass ratio of 95%:2.5%:2.5%. To the mixture, N-methylpyrrolidone (NMP) was added under stirring, to form a uniform slurry. The slurry was coated on an aluminum foil, blade smoothed, dried, rolled flat, stamped under a pressure of 100 MPa into a positive electrode plate with a diameter of 12 mm and a thickness of 120 μm, and then dried in a vacuum drying oven at 120° C. for 12 hours.
