Anode and cathode conductive additive for secondary lithium battery, method for preparing conductive additive, and method for preparing secondary lithium battery
A conductive additive, lithium secondary battery technology, used in battery electrodes, electrolyte battery manufacturing, non-aqueous electrolyte batteries, etc., can solve the problems of high price, difficult to meet the continuous charging and discharging of batteries, restricting practical applications, etc., to improve high temperature performance. , Conducive to high rate charge and discharge, the effect of superior performance
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Embodiment 1
[0042] Weigh 0.2g of polyvinylidene fluoride (PVDF) binder and dissolve it in 5 grams of N-methylpyrrolidone, then add 0.6g of graphene powder conductive additive, and stir evenly. Subsequently, 3.2 g of lithium iron phosphate positive electrode active material was added, stirred and dispersed for 1 hour. The obtained slurry was uniformly coated on an aluminum foil, dried under vacuum at 100° C., and rolled to form a positive electrode sheet. with LiPF 6 The solution is an electrolyte, and Cellgard2400 is used as a diaphragm to assemble a lithium-ion battery. The measured discharge capacity was 142mAh / g at 1C, 110mAh / g at 10C, and 80mAh / g at 30C. After the battery is charged and discharged 500 times at 1C, the capacity decay is less than 5%.
Embodiment 2
[0044] Weigh 0.2g of polyvinylidene fluoride (PVDF) binder and dissolve it in 5g of N-methylpyrrolidone, then add 0.2g of graphene powder conductive additive, and stir evenly. Subsequently, 3.6 g of lithium iron phosphate positive electrode active material was added, stirred and dispersed for 1 hour. The obtained slurry was uniformly coated on an aluminum foil, dried under vacuum at 100° C., and rolled to form a positive electrode sheet. with LiPF 6 The solution is an electrolyte, and Cellgard2400 is used as a diaphragm to assemble a lithium-ion battery. The measured discharge capacity was 140mAh / g at 1C, 100mAh / g at 10C, and 60mAh / g at 30C. After the battery is charged and discharged 500 times at 1C, the capacity decay is less than 5%.
Embodiment 3
[0046] Weighing 1g of graphene solids was added to 100g of N-methylpyrrolidone, and ultrasonically treated for 15 minutes to obtain a uniformly dispersed graphene sol. The above-mentioned graphene sol was concentrated to a slurry with a graphene mass concentration of 5% by centrifugation.
[0047] Weigh 0.2g of polyvinylidene fluoride (PVDF) binder and dissolve it in 1 gram of N-methylpyrrolidone, then add 4g of graphene slurry with a mass concentration of 5% prepared in the previous step, and stir evenly. Subsequently, 3.6 g of lithium iron phosphate positive electrode active material was added, stirred and dispersed for 1 hour. The obtained slurry was uniformly coated on an aluminum foil, dried under vacuum at 100° C., and rolled to form a positive electrode sheet. with LiPF 6 The solution is an electrolyte, and Cellgard2400 is used as a diaphragm to assemble a lithium-ion battery. The measured discharge capacity was 140mAh / g at 1C, 105mAh / g at 10C, and 69mAh / g at 30C. A...
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