Study on the capacity fading of LiFePO4 energy storage battery cycled at different temperature conditions
This work conducts the charge/discharge cycling tests of graphite||LiFePO4 pouch batteries at temperatures of 25,45,60,70,and 80 ℃ to calculate the battery cycling capacity degradation rate.Arrhenius formula is used to calculate the activation energy of LiFePO4 batteries at different tem-peratures.Differential capacity vs.voltage(dQ/dV)curves is used for capacity loss analysis.Com-bined with characterization data such as SEM,ICP,XRD,etc.,the results show that when the tem-perature exceeds 60 ℃ for cycling test,the growth of the SEI layer at graphite electrode interface ac-celerates,the microstructure of positive and negative electrode active materials ruptures,and the dis-solution/precipitation of transition metal ions aggravates,leading to deterioration of battery perfor-mance and accelerated capacity degradation.
electrochemical energy storagelithium ion phosphatecapacity decayaccelerated ag-inglife prediction
万方数据
维普
