中文摘要：

利用金刚石对顶砧装置研究了Li Cr0.35Mn0.65O2高压阻抗谱.随压力的增加,晶粒电阻先增加后减小,晶界电阻逐渐减小.在低压下,晶界电阻大于晶粒电阻,而压力高于21.52 GPa后,晶粒电阻较大,说明压力使影响样品电输运特性的主导区域由晶界变为晶粒.压力使晶界缺陷的种类和数量发生改变,导致样品卸压电阻远低于加压电阻,表明压力处理是提高Li Cr0.35Mn0.65O2电化学性能的有效手段.

英文摘要：

In this paper,in situ impedance spectroscopy measurement of Li Cr0. 35Mn0. 65O2 powders were conducted with a DAC. The grain resistance firstly increased and then decreased respectively with pressure,and the resistance of grain boundary decreased in the whole pressure region. The resistance of grain boundary was larger than that of grain at initial and then smaller after 21. 52 GPa,which indicated pressure changes the dominant region of charge carrier transportation from grain boundary to grain. Pressure varied the type and the amount of defects in the grain boundary region,and finally led the sample resistance in the decompression process much lower than that in the compression process,which indicated that the pressure treatment was an effective method for improving electrochemical performance of Li Cr0. 35Mn0. 65O2.