摘要
以商品化LiNi1/3Co1/3Mn1/3O2为例,运用电化学阻抗谱(EIS)跟踪界面阻抗随实验条件的变化,从动力学角度研究碳酸亚乙烯酯(VC)添加剂对锂离子嵌脱过程的影响。研究得出VC在材料电导率的提高及利于锂离子嵌脱方面也有较大作用。VC可使电极表面形成高介电常数、稳定的SEI膜,可降低约22%的离子跳跃能垒,更易于锂离子通过和电极内部的保护;VC可降低电极约17%的热激活化能,并使电子电导率在高电压下维持在较高水平;VC可降低约16%的嵌入反应活化能,更利于锂离子的嵌脱。
Variations of impedance spectra of commercial LiNi1/3Co1/3Mn1/2O2 electrode, which occurred at electrode/electrolyte interfaces, were investigated by electrochemical impedance spectroscopy （EIS） with different experiment condition, and influences of VC in the lithiation/delithiation processes were studied by electrochemical reaction from the point of kinetic view. It is found that, VC is favor of increasing the ion conductivity and the charge/discharge process. VC can depress 22% of the energy barriers for ions jump relating to the solid electrolyte interphase （SEI） film,17% of the thermal active energies of the electronic conductivities and 16% of the interca- lation/deintercalation reaction active energies.
出处
《电源技术》
CAS
CSCD
北大核心
2013年第5期732-735,共4页
Chinese Journal of Power Sources
基金
中国矿业大学高水平论文专项基金资助项目(2012LWB24)
