Abstract: The influence of electrolyte-soaking on LiNi1/3Co1/3Mn1/3O2 powder was mainly investigated.Scanning electron micro- scope（SEM） was used to observe the surface morphology of the powder at various durations，X-ray diffraction（XRD） and Roman spectrum were used to characterize the structure of crystal.The initial discharge and rate performance were also analyzed by assembling the sample into lithium ion batteries.Results showed that electrolyte-soaking had a small impact on the surface morphology and structure of LiNi1/3Co1/3Mn1/3O2.But it had a lager impact on the resistivity of powder and the capacity of cells.With the increasing of soaking-temperature，both the powder resistivity and the specific capacity had decreased.

Key words: lithium ion battery, LiNi1/3Co1/3Mn1/3O2, electrolyte, soaking