【作者】 伍凌； 王志兴； 李新海； 李灵均； 郑俊超； 郭华军； 彭文杰；

【Author】 WU Ling WANG Zhi-xing LI Xin-hai LI Ling-jun ZHENG Jun-chao GUO Hua-jun PENG Wen-jie (School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China)

【机构】 中南大学冶金科学与工程学院；

【摘要】 用共沉淀法制备掺钛前驱体 FePO₄·2H₂O,对 FePO₄·2H₂O 经常温还原插锂合成 LiFePO₄的前驱混合物, 后经热处理得橄榄石型 LiFePO₄;用 SEM,XRD 和恒流充放电等对样品进行表征,考察 Ti 掺杂和合成温度对 LiFePO₄的物理和电化学性能的影响。研究结果表明,在600℃时合成的 Ti 掺杂样品具有优异的电化学性能,该样品在0.1C,1C 和2C 倍率下的首次放电比容量分别为150,130和125 mA·h/g,循环40次后的放电比容量均无衰减。更多还原

【Abstract】 Ti-doped precursors （FePO₄·2H₂O） were prepared by co-precipitation method.Olivine-type LiFePO₄ were synthesized by sintering the LiFePO₄ precursor-mixtures which were obtained via reduction and lithiation of FePO₄·2H₂O at room temperature.The samples were characterized by scanning electron microscopy,X-ray diffractometry and electrochemical charge and discharge tests.Effects of Ti-doping and sintering temperature on physical and electrochemical performance of LiFePO₄ were investigated.The results show that the Ti-doped sample sintered at 600℃ has excellent electrochemical performance.Its initial discharge capacities are 150,130 and 125 mA·h/g at 0.1 C,1C and 2C rates,respectively,and no capacity fading is found after 40 cycles.更多还原