To investigate the optimal mixing ratio of secondary and single particle artificial graphite and their effect on electrochemical performance,the morphology and microstructure of the compound graphite are characterized and analyzed by SEM and XRD.The different formula mass ratios(3∶7,5∶5 and 7∶3)of secondary particles and single particles of artificial graphite for anode are verified.The electrochemical performance characteristics such as rate capability,high and low temperature,storage self-discharge and cycle performance are compared with the national standard GB/T 36276-2018.2.00 P(800 W)discharge capacity at 25℃,5℃low-temperature energy retention rate,self-discharge at 25℃,0.5 P and 1.0 P cycle performance at 25℃is the best when the mass ratio of secondary particles to single particles is 5∶5,the room temperature energy retention rate of 1 459 cycles at 0.5 P in 2.50-3.65 V is 95.2%,the energy retention rate of 2 500 cycles at 1.0 P in 2.50-3.65 V is 88.7%.
关键词
单颗粒/二次颗粒/复配人造石墨/电化学性能
Key words
single particle/secondary particle/secondary mixing artificial graphite/electrochemical performance
维普
万方数据