Ag+-掺杂锂钒氧化物的合成及其电化学性能

报道了用V2O5湿凝胶、Li2CO3和Ag2CO3通过液相反应合成用于锂离子电池正极材料的Ag -LiV3O8.其前驱体和产品分别利用热分析(DTA-TG)、扫描电镜(SEM)、X射线衍射(XRD)、红外光谱(IR)技术进行表征.其电化学性能通过恒电流充放电、循环伏安法和交流阻抗技术进行研究.实验表明,活性材料在不同的放电倍率和1.8～3.6 V的电压范围内具有较高的首次放电容量;在0.15 C循环250次后保持180 mAh/g的放电容量.

Synthesis and electrochemical performance of Ag+ doped lithium vanadium oxide

Ag~ doped LiV_3O_8 as a cathode material for lithium ion batteries was synthesized by solution reaction and low temperature calcination technique with V_2O_5 wet-gel, Li_2CO_3 and Ag_2CO_3 as raw materials. The precursor and product were characterized by differential thermalanalysis thermogravimetry(DTA-TG), scanning electron microsopy(SEM), X-ray diffraction(XRD), infrared spectroscopy(IR) measurements. Its electrochemical behavior as a cathode material for rechargeable lithium-ion batteries was studied by galvanostatic charge-discharge, cyclic voltammetry, and AC impedance technique. The experiment results show that the active material Ag~ -LiV_3O_8 has higher first discharge capacity at various rates, and it maintains a discharge capacity of 180 mAh/g at 0.15 C rate over the voltage range of 1.8 V3.6 V after 250 cycles.