Ag掺杂的锂离子导体材料的研究

Study on Ag-doped lithium-ion conductor materials

锂离子电池中的液态电解质存在漏液、腐蚀电极、氧化、燃烧甚至爆炸等安全隐患,固态电解质因具有安全性高、能量密度大、循环寿命长以及稳定性良好等优点走进了大众的视野。目前,在所知的无机氧化物固态电解质中,钙钛矿型Li_(0.33)La_(0.56)TaO_(3)(LLTO)电解质材料的综合性能较好,具有较高的晶粒电导率,并且和正负极材料之间具有良好的相容性,未来具有很大的发展前景。为了进一步提高该材料的总电导率,采用固相法将Ag掺杂到LLTO中,通过密度、交流阻抗和离子活化能等测试研究了不同掺杂量对LLTO相对密度、总电导率以及活化能的影响。

The liquid electrolyte in lithium-ion batteries has safety hazards such as leakage,corrosion of electrodes,oxidation,combustion and even explosion,etc.The solid electrolyte has come into the public eye because of its high safety,high energy density,long cycle life and good stability.At present,among the known inorganic oxide solid-state electrolytes,perovskite type Li_(0.33)La_(0.56)TaO_(3)(LLTO)electrolyte materials have good overall performance,high grain conductivity and good compatibility with anode and cathode materials,and have great prospects for future development.In order to further improve the total conductivity of this material,Ag was doped into LLTO by solid phase method,and the effects of different doping amounts on the relative density,total conductivity and activation energy of LLTO were investigated by density,AC impedance and ion activation energy tests.