锰酸锂的SEI膜研究

Study on SEI Film of Lithium Manganate

通过循环伏安(CV)、电化学交流阻抗谱(EIS)及恒流充放电研究锰酸锂表面的成膜性能及电化学性能。结果表明,锰酸锂表面的SEI膜在电池首次充电过程中就开始形成,充放电循环至3周时,SEI膜得到较大程度的修补和完善。但循环到一定次数后,SEI膜会逐渐变厚,直接影响电池的电化学性能。

The formation of solid electrolyte interphase film on lithium manganate was investigated by cyclic voltammetry（CV）, electrochemical impedance spectroscopy （EIS） and constant- current charge -discharge. It was found that the formation of SEI film on the surface of lithium manganatehas started during the initial charge cycle. The SEI film was repaired and improved after 3 cycles. But after cycle to a certain number of times, SEI film would gradually be thickening and directly influenced the electrochemical properties of the battery.