溶胶-凝胶法合成磷酸铁锂正极材料

Preparation of lithium iron phosphate anode material by sol-gel technique

以FePO4·4H2O、LiOH·H2O、草酸为原料,以葡萄糖为碳源,采用溶胶-凝胶法合成磷酸铁锂正极材料。利用X射线衍射(XRD)、扫描电镜(SEM)等方法进行表征,并将材料组装成电池研究其电化学性能。结果表明:以葡萄糖为碳源,采用溶胶-凝胶法合成磷酸铁锂正极材料具有单一的橄榄石型晶体结构,充放电平台平稳。葡萄糖添加量为5.9%时,材料的充放电比容量和循环性能较高,室温下,0.1C和0.2C首次放电比容量达143.3mA·h/g和133.7mA·h/g,循环50次后仍保持在134.2mA·h/g和124.5mA·h/g。

Lithium iron phosphate anode material was prepared via a sot-gel method using FePO4·4H2O, LiOH ·H2O and oxalic acid as raw materials and glucose as carbon source. The crystal structure was characterized by XRD and SEM. Electrochemical performance was tested by assembling the material into battery. The results demonstrated that using glucose as carbon source,lithium iron phosphate anode material synthesized by sol-gel method had a single olivine crystal structure,charge and discharge platform was stability. The material charge and discharge capacity and cycle performance were high with the addition of glucose was 5.9 %. At the room temperature, the initial discharge capacity of the material at 0. 1C and 0. 2C was 143. areA · h/g and 132. 7mA·h/g, respectively. After 50 cycles, the capacity at 0. 1C reached134. 2mA. h/g.