低温合成锂离子二次电池正极材料Li_(1+x)V_3O_8及其性能

Property of Li_(1+x)V_3O_8 Synthesized at Low Temperature for Lithium Secondary Battery

以 L i2 CO3 和 NH4 VO3 为原料 ,低温合成了 L i1+ x V3 O8.通过对中间产物的热分析 ,选定了低温合成 L i1+ x V3 O8的适宜煅烧温度为 30 0℃ .研究表明 ,L i1+ x V3 O8,原料 L i/ V摩尔比应大于1∶ 3.以 Li1+ x V3 O8作为正极材料 ,金属锂为负极组装了模拟电池 ,高、低温合成材料具有较高的放电容量和放电电压 .XRD、SEM分析结果说明低温合成样品的结晶度低、粒径较小 .

Li 1+ x V 3O 8 was synthesized from Li 2CO 3 and NH 4VO 3 at 300 ℃. The relationships between molar ratio of Li/V in raw materials and element distribution in products were studied. The XRD and SEM results revealed that Li 1+ x V 3O 8 synthesized at 300 ℃ had a lower crystallinity and smaller particle size than that obtained at 680 ℃ and also had higher discharge capacity and discharge voltage.