Abstract: LiFePO4 cathode material will react with electrolyte during the application of lithium ion battery，which will cause dissolution of Fe and further lead to poor compatibility of cathode material with electrolyte.To study the compatibility of cath- ode material with electrolyte and its impact on the storage performance of lithium ion battery，the Fe dissolutions of different LiFePO4 cathode materials in different electrolytes were characterized by the inductively coupled plasma atomic emission spectroscopy，and then the storage performances of lithium ion battery at normal-and high-temperatures were tested.Results showed that LiFePO4 cathode material had selectivity to electrolyte，and the larger the dissolved content of Fe，the worse the compatibility of cathode material with electrolyte，the greater the impact on the performance of lithium ion battery.

Key words: lithium ion battery, LiFePO4, cathode material, electrolyte, dissolved content of Fe