【摘要】 使用固相合成法在不同温度下合成磷酸亚铁锂 .以它为正极活性物质组装成模拟电池测试充放电性能 .使用 XRD和 IR表征样品 .测试结果表明磷酸亚铁锂电池具有平稳的放电平台 ,良好的循环性能 .在0 .0 5 m A/cm2的电流密度下 ,60 0℃合成的样品初始放电容量达到 90 m Ah/g,第 1 0个循环的放电容量达到1 0 0 m Ah/g,80个循环后放电容量仍保持初始容量的 97%以上 ,表明它具有优秀的循环性能 . 5 0 0℃合成的样品中有杂相存在 ,70 0℃合成的样品的晶粒度过大 ,这两个因素都可能使放电容量降低 .在本实验条件下 ,60 0℃是较佳合成温度.更多还原

【Abstract】 Lithium iron(Ⅱ) phosphate was synthesized at different temperatures by solid state synthesis method and the performance of the cathodes was evaluated using analogous cells. The samples were characterized by X-ray diffraction and Infrared Ray absorption spectrum. The sample synthesized at 600℃ had discharge capacity of 90 mAh/g at the first cycle, and 100 mAh/g at the 10 th cycle .Its capacity kept more than 97% of the first cycle after 80 cycles. It was shown that lithium iron(Ⅱ) phosphate had long cycle life and was a potential cathode material to replace lithium cobalt oxide.更多还原