作 者：
;
;
机构地区：
华南师范大学化学与环境学院化学系
出 处：
《化学学报》
2003年第2期225-229,共5页
摘 要：
用粉末微电极研究了尖晶石锂锰氧化物在不同嵌锂状态下嵌脱锂过程的交流阻抗图谱 ,提出了新的等效电路模型 .描述锂离子在固体中扩散的Warburg阻抗与累积或消耗的嵌入电容在LixMnO4中的x≤ 0 .5时串联 ,0 .5
Electrochemical impedance spectroscopies of insertion and deinsertion of U ion in spinel lithium manganese oxide with different contents of inserted lithium ions were studied by using a powder microelectrode. New equivalent circuits modeling the insertion and deinsertion were proposed to fit the experimental electrochemical impedance spectroscopies. The Warburg impedance describing the diffusion and the insertion capacitance describing the accumulation or consumption of U ion in the oxide are in sequence when x less than or equal to 0.5, but in paralell when 0.5 < x 1 in Li-x MnO4. The fitting results were in agreement with the experimental results. The capacitance and the resistance for the transfer of Li ions in the surface film on the oxide, the double capacitance and the resistance for the charge transfer of Li ion insertion or deinsertion, and the Warburg impedance and the insertion capacitance under different potentials were obtained by using the proposed models.
关 键 词：
尖晶石
锂锰氧化物
锂离子
嵌脱过程
交流阻抗谱
锂离子电池
等效电路
领 域：
[电气工程]
[理学]
[理学]
