关键词: 4A分子筛, 锂化分子筛, 恒电流, 循环性能

Abstract: The different concentration of Na + was introduced into the non_aqueous eletrolyte system EC/DEC/LiClO 4 with 4A molecular sieve and lithiated 4A molecular sieve,by which the trace amount of water was removed.The concentrations of Na + and Li + were determined by atomic adsorption spectrometry. The cycle performance of lithium/improved graphite cells was then examined by charging and discharging under the constant electric current.The results demonstrated that the cycle performance of the cells was destroyed by the high concentration of Na + under the small electric current.With the increase of electric current,the cell became less sensitive to the concentration of Na +.According to the examination of cycled cathode's surface by SEM,the mechaninsm of sodium ion's effect on cycle performance of lithium ion cell was raised.