以Li_2CO_3和NH_4VO_3为原料,在不同条件下合成了锂离子电池正极材料用Li_(1+x)V_3O_8. 研究了反应物的分散条件和煅烧温度对产物晶型结构、形貌及电化学性能的影响. XRD、IR和SEM结果表明,用超声波在无水乙醇中分散反应物得到的前驱体于550 ℃下煅烧,所得产物Li_(1+x)V_3O_8结晶度低、粒径小、形貌均匀. 充放电、循环伏安等结果表明,该材料在充放电过程中极化低、嵌脱锂位置多、循环稳定性好. 在0.5 C放电条件下,第2次循环放电容量达到268 mA·h/g,100次循环后容量仍保持210 mA·h/g以上.
The anodic material of Li_(1+x)V_3O_8 was synthesized with Li_2CO_3 and NH_4VO_3 as the reactants under different conditions. The effects of the reactant dispersion and the calcining temperature on the structure, morphology and electrochemical properties of the products were investigated. XRD, IR and SEM experiments show that the sample synthesized at 550 ℃ from the precursor obtained with ultrasonically treating reactants in anhydrous ethanol has low crystallinity, small grain size and homogeneous morphology. And it has low polarization, more lithium insertion/extraction sites and good cyclability. Its discharge capacity reaches 268 mA·h/g in the 2nd cycle at a discharge rate of 0.5 C and still retains 210 mA·h/g after 100 cycles.
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