摘要
采用熔盐法用Li+取代NiO中Ni 2+制备了Li0.29Ni0.71O材料,研究Li+取代Ni 2+对材料电化学性能的影响,并利用电化学阻抗谱(EIS)研究材料的电化学动力学性能.结果表明:Li0.29Ni0.71O比NiO的电化学容量稍小;首次充放电循环后,在材料中形成Li2O;表面膜(SEI)阻抗的降低和电化学扩散率的增加与材料由晶体转变为非晶态有关.
A typical Li＋ substituted NiO compound, Li0. 29Ni0.71 O, was synthesized by molten nitrate method, and the effect of Li＋ ions doped on the electrochemical performance was also studied. The materail showed a smaller electrochemical capacity compared to NiO. In addition, there was an irreversible formation of Li20 in the first discharge-charge cycling. The kinetic behavior of Li0.29 Ni0.7l O was investigated by EIS analysis. The unusual decrease of SEI resistance and the increase of chemical diffusion coefficient in the several initial cycles were explained in terms of the transformation from crystalline to amorphous state of the electrode material.
出处
《吉林大学学报（理学版）》
CAS
CSCD
北大核心
2013年第1期120-123,共4页
Journal of Jilin University:Science Edition
基金
吉林省科技发展计划项目(批准号:201205035)
环境友好材料制备与应用省部共建教育部重点实验室研究项目
关键词
电化学
负极材料
熔盐法
电化学阻抗谱
electrochemistry
anode materials
molten nitrates method
electrochemical impedance spectroscopy
